CN106816807B - Intracavity pump optical parametric oscillator using optical fiber laser as pump source - Google Patents
Intracavity pump optical parametric oscillator using optical fiber laser as pump source Download PDFInfo
- Publication number
- CN106816807B CN106816807B CN201710199713.9A CN201710199713A CN106816807B CN 106816807 B CN106816807 B CN 106816807B CN 201710199713 A CN201710199713 A CN 201710199713A CN 106816807 B CN106816807 B CN 106816807B
- Authority
- CN
- China
- Prior art keywords
- laser
- opo
- mirror
- curved mirror
- fiber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Lasers (AREA)
Abstract
The invention discloses an intracavity pump optical parametric oscillator taking an optical fiber laser as a pump source, wherein the pump source of the optical fiber laser emits laser in a single-mode gain optical fiber absorption band, the laser enters a single-mode gain optical fiber through a beam combiner to form population inversion, and laser oscillation is formed in a resonant cavity of the optical fiber laser; the nonlinear crystal is arranged in a resonant cavity of the fiber laser, and laser oscillated in the cavity passes through the nonlinear crystal to generate OPO signal light and OPO idler frequency light; the resonant cavity of the OPO signal light is partially overlapped with the resonant cavity of the fiber laser, so that the oscillation threshold of the OPO can be effectively reduced, and the power conversion efficiency can be improved. The nonlinear crystal is arranged between the pair of curved mirrors, and the cavity length of the OPO signal optical cavity is increased by using the output coupling mirror and the high-reflection mirror, so that the spot areas of the OPO signal and the pump light in the nonlinear crystal can be reduced, and the purpose of further reducing the OPO oscillation threshold is achieved; the oscillation threshold of the OPO can be effectively reduced, the power conversion efficiency of the OPO is improved, and the structure is simple.
Description
Technical Field
The invention relates to the field of optical parametric oscillators, in particular to an intracavity pumping optical parametric oscillator taking an optical fiber laser as a pumping source.
Background
An Optical Parametric Oscillator (OPO) converts incident laser, namely pumping light, into two outgoing laser beams with different frequencies by utilizing a second-order nonlinear effect, wherein one of the outgoing laser beams with higher frequency is called signal light, the other outgoing laser beam with lower frequency is called idler light, and the frequency of the pumping light is equal to the sum of the frequencies of the signal light and the idler light; the optical parametric oscillator is used for expanding the output wave band of laser radiation and realizing broadband tunable laser radiation.
A continuous wave single-resonance optical parametric oscillator generally adopts an optical fiber amplifier as a pumping source; a longer periodically poled nonlinear crystal, such as a periodically poled lithium niobate crystal (PPLN), is used as a gain medium to lower the oscillation threshold, which is generally about 2W; when the pump power is 10W, the output idler power is about 1W. Typical configurations and experimental results of a continuous wave single resonant optical parametric oscillator are shown in the documents e.andrieux, t.zanon, m.cadoret, a.rihan, and j.j.j.zondy, "500 GHz mode-hop-free tuning range with a frequency-stabilized position optical parametric oscillator," op.lett.36, 1212-1214 (2011).
The structure of the single-resonance optical parametric oscillator is relatively complex, and when a continuous wave pumping source is adopted, the oscillation threshold is higher and the conversion efficiency is low. The optical parametric oscillator is arranged in a resonant cavity of the laser, so that the oscillation threshold value of the optical parametric oscillator can be reduced, and the nonlinear conversion efficiency is improved; an optical isolator element is not required, and thus the structure is relatively simple.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an intracavity pumping single-resonance optical parametric oscillator using an optical fiber laser as a pumping source, and aims to solve the problems of high oscillation threshold, low conversion efficiency and complex structure in the prior art.
The invention provides an intracavity pump optical parametric oscillator using a fiber laser as a pump source, which comprises: the optical fiber laser comprises a pumping source of an optical fiber laser, an optical fiber grating reflector, a single-mode gain optical fiber, a beam combiner, a collimating lens, a polarizing plate, a dichroic mirror, a first curved mirror, a nonlinear crystal and a second curved mirror; a pumping source of the optical fiber laser emits laser in a single-mode gain optical fiber absorption band, and the laser enters the single-mode gain optical fiber through a beam combiner to form OPO pumping light; forming laser oscillation in a first resonant cavity formed by the fiber grating reflector, the single-mode gain fiber, the beam combiner, the collimating lens, the polarizing plate, the dichroic mirror, the first curved mirror and the second curved mirror by the OPO pump light; the nonlinear crystal is positioned in the first resonant cavity and is arranged between the first curved mirror and the second curved mirror; the laser oscillating in the first resonant cavity passes through the nonlinear crystal to generate OPO signal light and OPO idler frequency light; and OPO signal light forms oscillation in a second resonant cavity formed by the dichroic mirror, the first curved mirror and the second curved mirror, and OPO idle frequency light is respectively output through the first curved mirror and the second curved mirror.
The invention provides an intracavity pump optical parametric oscillator using a fiber laser as a pump source, which comprises: the optical fiber laser comprises a pumping source of an optical fiber laser, an optical fiber grating reflector, a single-mode gain optical fiber, a beam combiner, a collimating lens, a polarizing plate, a dichroic mirror, an output coupling mirror, a first curved mirror, a nonlinear crystal and a second curved mirror; a pumping source of the optical fiber laser emits laser in a single-mode gain optical fiber absorption band, and the laser enters the single-mode gain optical fiber through a beam combiner to form OPO pumping light; the OPO pump light forms laser oscillation in a first resonant cavity formed by the fiber grating reflector, the single-mode gain fiber, the beam combiner, the collimating lens, the polarizer, the dichroic mirror, the first curved mirror and the second curved mirror; the nonlinear crystal is positioned in the first resonant cavity and is arranged between the first curved mirror and the second curved mirror; laser oscillated in the first resonant cavity passes through the nonlinear crystal to generate OPO signal light and OPO idler frequency light; the OPO signal light forms oscillation in a third resonant cavity formed by the output coupling mirror, the dichroic mirror, the first curved mirror and the second curved mirror, the OPO signal light is output through the output coupling mirror, and the OPO idle frequency light is output through the first curved mirror and the second curved mirror respectively.
The invention provides an intracavity pump optical parametric oscillator using a fiber laser as a pump source, which comprises: the device comprises a pumping source of a fiber laser, a fiber grating reflector, a single-mode gain fiber, a beam combiner, a collimating lens, a polarizing plate, a dichroic mirror, a first curved mirror, a nonlinear crystal, a second curved mirror and a high-reflection mirror; a pumping source of the optical fiber laser emits laser in a single-mode gain optical fiber absorption band, and the laser enters the single-mode gain optical fiber through a beam combiner to form OPO pumping light; the OPO pump light forms laser oscillation in a fourth resonant cavity formed by the fiber grating reflector, the single-mode gain fiber, the beam combiner, the collimating lens, the polarizer, the dichroic mirror, the first curved mirror, the second curved mirror and the high-reflection mirror; the nonlinear crystal is positioned in the fourth resonant cavity and is arranged between the first curved mirror and the second curved mirror; laser oscillated in the fourth resonant cavity passes through the nonlinear crystal to generate OPO signal light and OPO idler frequency light; the OPO signal light forms oscillation in a fifth resonant cavity formed by the dichroic mirror, the first curved mirror, the second curved mirror and the high-reflection mirror, and the OPO idle frequency light is output through the first curved mirror and the second curved mirror respectively.
The invention provides an intracavity pump optical parametric oscillator using a fiber laser as a pump source, which comprises: the optical fiber laser comprises a pumping source of an optical fiber laser, a fiber grating reflector, a single-mode gain optical fiber, a beam combiner, a collimating lens, a polarizing plate, a dichroic mirror, an output coupling mirror, a first curved mirror, a nonlinear crystal, a second curved mirror and a high-reflection mirror; a pumping source of the optical fiber laser emits laser in a single-mode gain optical fiber absorption band, and the laser enters the single-mode gain optical fiber after passing through the beam combiner to form OPO pumping light; forming laser oscillation in a fourth resonant cavity formed by the fiber grating reflector, the single-mode gain fiber, the beam combiner, the collimating lens, the polarizing plate, the dichroic mirror, the first curved mirror, the second curved mirror and the high-reflection mirror by the OPO pump light; the nonlinear crystal is positioned in the fourth resonant cavity and is arranged between the first curved mirror and the second curved mirror; laser oscillated in the fourth resonant cavity passes through the nonlinear crystal to generate OPO signal light and idler frequency light; the OPO signal light forms oscillation in a sixth resonant cavity formed by the output coupling mirror, the dichroic mirror, the first curved mirror, the nonlinear crystal, the second curved mirror and the high-reflection mirror, the OPO signal light is output through the output coupling mirror, and the OPO idle frequency light is output through the first curved mirror and the second curved mirror respectively.
In the invention, the fiber grating reflector provides high reflection for OPO pump light (namely laser generated by a fiber laser); the output coupling mirror is plated with an OPO signal light high-reflection or partial reflection film; the dichroic mirror is plated with an OPO pumping light anti-reflection film and a signal light high-reflection film; the first curved mirror and the second curved mirror are plated with OPO pump light and signal light high-reflection and idler frequency light antireflection films; plating OPO pumping, signal and idler frequency light antireflection films on the nonlinear crystal; the high-reflection mirror is plated with an OPO pump and a signal light high-reflection film; the reflectivity of the high reflection film reaches 99% or more, and the transmissivity of the antireflection film reaches 90% or more.
The first curved mirror and the second curved mirror are adopted for realizing the focusing of OPO signals and pumping light in the nonlinear crystal so as to reduce the oscillation threshold of OPO; the cavity length of an OPO signal optical cavity is increased by adopting an output coupling mirror and a high-reflection mirror, so that the light spot area of an OPO signal and pumping light in a nonlinear crystal is further reduced, and the oscillation threshold of the OPO is further reduced.
Furthermore, the pump source of the fiber laser is a single-mode or multi-mode semiconductor laser, a solid laser or a fiber laser.
Furthermore, the single-mode gain fiber is a single-clad or double-clad fiber doped with Nd, Yb, Er, Tm, or Ho.
Further, the beam combiner is a wavelength division multiplexing beam combiner, a pump beam combiner or a laser beam combiner.
Further, a collimating lens is used to achieve collimation of the fiber laser and achieve matching to the OPO pump resonator spatial mode.
Furthermore, the polaroid is used for selecting the laser polarization direction of the optical fiber laser, and the requirement of the nonlinear crystal on the polarization of the pump light is met.
Further, the nonlinear crystal is a periodically poled lithium niobate crystal, a potassium titanyl phosphate crystal, or other crystal that can produce nonlinear gain.
Compared with the prior art, the invention has the following beneficial effects:
(1) compared with the existing optical parametric oscillator of the external cavity pump, the OPO is arranged in the resonant cavity of the optical fiber laser, so that the OPO pump light oscillates in the OPO signal light resonant cavity, and the oscillation threshold of the OPO is reduced; the power conversion efficiency of the OPO is improved; an optical isolator element is not required, and thus the structure is relatively simple.
(2) Compared with the existing optical parametric oscillator of intracavity pump, the optical fiber laser can provide better beam quality and higher power conversion efficiency.
(3) The OPO is placed in the resonant cavity of the fiber laser, the Q value of the resonant cavity of the fiber laser is low due to the large coupling loss from the free space optical element to the optical fiber, and the power density in the resonant cavity of the laser is only slightly improved compared with that outside the resonant cavity, so that the oscillation threshold of the OPO is still high when the OPO is placed in the resonant cavity of the fiber laser; the invention achieves the purpose of further reducing the OPO oscillation threshold by arranging the nonlinear crystal between the pair of curved mirrors and increasing the cavity length of the OPO signal optical cavity by using the output coupling mirror and the high-reflection mirror to reduce the spot areas of the OPO signal and the pumping light in the nonlinear crystal.
Drawings
Fig. 1 is a schematic structural diagram of a fiber laser intracavity pumped single-resonance optical parametric oscillator provided in embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of a fiber laser intracavity pumped single-resonant optical parametric oscillator provided in embodiment 2 of the present invention.
Fig. 3 is a schematic structural diagram of a fiber laser intracavity pumped single-resonant optical parametric oscillator provided in embodiment 3 of the present invention.
Fig. 4 is a schematic structural diagram of a fiber laser intracavity pumped single-resonant optical parametric oscillator provided in embodiment 4 of the present invention.
Wherein, 1 is the pumping source of the fiber laser, 2 is the fiber grating reflector, 3 is the single mode gain fiber, 4 is the beam combiner, 5 is the collimating lens, 6 is the polaroid, 7 is the dichroic mirror, 8 is the output coupling mirror, 9 is the first curved mirror, 10 is the nonlinear crystal, 11 is the second curved mirror, 12 is the high reflection mirror.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 4, in the present invention, an intracavity pumped single-resonant optical parametric oscillator using a fiber laser as a pumping source includes: a pumping source 1 of the fiber laser, a fiber grating reflector 2, a single-mode gain fiber 3, a beam combiner 4, a collimating lens 5, a polarizer 6, a dichroic mirror 7, an output coupling mirror 8, a first curved mirror 9, a nonlinear crystal 10, a second curved mirror 11 and a high-reflection mirror 12, wherein,
the fiber grating mirror 2 provides high reflection for the OPO pump light (i.e., the laser light generated by the fiber laser); the output coupling mirror 8 is plated with an OPO signal light high reflection or partial reflection film; the dichroic mirror 7 is plated with an OPO pumping light anti-reflection and signal light high-reflection film; the first curved mirror 9 and the second curved mirror 11 are coated with films which are highly reflective to OPO pump light and signal light and anti-reflective to idler frequency light; plating OPO pumping, signal and idler frequency light antireflection films on the nonlinear crystal 10; the high-reflection mirror 12 is plated with an OPO pumping and signal light high-reflection film; the high reflection film has a reflectance of 99% or more and an antireflection film has a transmittance of 90% or more.
A pumping source 1 of the optical fiber laser emits laser in a single-mode gain optical fiber 3 absorption band, and the laser enters the single-mode gain optical fiber 3 after passing through a beam combiner 4; the OPO pump light forms laser oscillation in a fiber laser resonant cavity which is composed of a fiber grating reflector 2, a single-mode gain fiber 3, a beam combiner 4, a collimating lens 5, a polarizing plate 6, a dichroic mirror 7, a first curved mirror 9, a nonlinear crystal 10, a second curved mirror 11 and a high-reflection mirror 12; the laser oscillated in the cavity passes through the nonlinear crystal 10, and gains of OPO signal light and idler frequency light can be generated; forming oscillation in a resonant cavity formed by an output coupling mirror 8, a dichroic mirror 7, a first curved mirror 9, a nonlinear crystal 10, a second curved mirror 11 and a high-reflection mirror 12 by OPO signal light, outputting the generated OPO signal light through the output coupling mirror, and outputting the generated OPO idler frequency light through the first curved mirror and the second curved mirror; the purpose of adopting the first curved mirror and the second curved mirror is to realize the focusing of OPO signals and pumping light in the nonlinear crystal so as to reduce the oscillation threshold of OPO; the cavity length of the OPO signal optical cavity is increased by adopting an output coupling mirror and a high reflection mirror, and the purpose is to further reduce the light spot area of the OPO signal and the pumping light in the nonlinear crystal so as to further reduce the oscillation threshold of the OPO.
In the embodiment of the invention, the pumping source of the optical fiber laser can be a semiconductor laser, a solid laser or an optical fiber laser; the single-mode gain fiber may specifically be: nd-doped, Yb-doped, Er-doped, Tm-doped or Ho-doped single-clad or double-clad fibers. The beam combiner may specifically be: a wavelength division multiplexing combiner or a pump/laser combiner. The collimating lens is used for realizing collimation of the fiber laser and matching with an OPO pumping resonant cavity space mode. The polaroid is used for selecting the laser polarization direction of the optical fiber laser and meets the requirement of the nonlinear crystal on the polarization of the pump light. The nonlinear crystal can be a periodically poled lithium niobate crystal, a potassium titanyl phosphate crystal or other crystals capable of producing nonlinear gain.
The fiber grating reflector provides high reflection for OPO pump light; the output coupling mirror is plated with an OPO signal light high-reflection or partial reflection film; the dichroic mirror is plated with an OPO pumping light anti-reflection film and a signal light high-reflection film; the first curved mirror and the second curved mirror are plated with the same film, and the film has high reflection on OPO pump light and signal light and anti-reflection on idler frequency light; coating a film on the nonlinear crystal 10, wherein the film is an antireflection film for OPO pumping, signal and idler frequency light; the high-reflection mirror 12 is coated with a high-reflection film for the OPO pump and signal light.
In the embodiment of the present invention, when the single-mode gain fiber 3 is a Yb-doped fiber, the pumping source 1 of the fiber laser may be a semiconductor laser with a wavelength of 976 nm, and the reflection wavelength of the fiber grating mirror 2 is 1064 nm, so that the wavelength of the fiber laser, that is, the wavelength of the OPO pumping light, is 1064 nm; the nonlinear crystal 10 may be a PPLN, and when the polarization period of the PPLN is 30.8 micrometers, the wavelengths of the signal light and the idler light are 1570 nanometers and 3306 nanometers, respectively; tuning of the OPO output signal light and idler wavelengths can be achieved by changing the reflection wavelength of the fiber grating mirror 2 or changing the polarization period or temperature of the PPLN.
In an embodiment of the present invention, the single-mode gain fiber 3 may be a Nd-, Yb-, Er-, Tm-, or Ho-doped single-clad or double-clad fiber. Since different dopings will operate at different wavelengths, the appropriate doping medium can be selected according to the desired wavelength. The selection of the single-clad or double-clad optical fiber depends on a pumping source, when the pumping source 1 is a single-mode laser, the single-mode gain optical fiber 3 is a single-clad optical fiber, and the beam combiner 4 is a wavelength division multiplexing beam combiner; when the pump source 1 is a multimode laser, the single-mode gain fiber 3 is a double-clad fiber, and the beam combiner 4 is a multimode pump/laser beam combiner. This is applicable to experiments whether the pump source is a single mode or multimode laser.
In the embodiment of the present invention, the pump source 1 of the fiber laser may be a single-mode or multi-mode semiconductor laser, a solid-state laser, or a fiber laser capable of realizing population inversion in the single-mode gain fiber 3.
In the embodiment of the present invention, the collimating lens 5 is used for collimating the fiber laser and matching with the spatial mode of the OPO pumping resonator, so that in space, two coaxial gaussian beams are in an object-image conjugate relationship with each other with respect to the lens.
In the embodiment of the present invention, the polarizer 6 is used to select the laser polarization direction of the fiber laser, and the polarization direction needs to be consistent with the direction required by the nonlinear crystal, so as to meet the requirement of the nonlinear crystal on the polarization of the pump light.
In an embodiment of the present invention, the nonlinear crystal 10 may be a periodically poled lithium niobate crystal, a potassium titanyl phosphate crystal, or other crystal that produces nonlinear gain. The periodically poled lithium niobate crystal (PPLN crystal) is a nonlinear crystal with high efficiency wavelength conversion, has wide light transmission range, covers near and intermediate infrared regions, has long service life, and can be used for frequency doubling, difference frequency, sum frequency, optical parametric oscillation, optical parametric amplification and the like, and the range of 0.4-4.5 micrometers is wide. Potassium titanyl phosphate (KTP) crystal is a nonlinear optical crystal which has excellent nonlinear optical properties and has been widely regarded and applied, the KTP crystal is a positive optical double crystal, the light-transmitting wave band of the KTP crystal is 350 nm-4.5 um, and the phase matching of frequency multiplication, frequency sum and optical parametric oscillation of 1.064um neodymium ion laser and other wave bands of laser can be realized.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In order to further explain the intracavity pump optical parametric oscillator using the fiber laser as the pump source according to the embodiment of the present invention, the present invention is further described in detail with reference to the following specific examples and the accompanying drawings.
As shown in fig. 1, a fiber laser intracavity pumped single-resonance optical parametric oscillator provided in embodiment 1 of the present invention includes: the optical fiber laser comprises a pumping source 1 of an optical fiber laser, a fiber grating reflector 2, a single-mode gain optical fiber 3, a beam combiner 4, a collimating lens 5, a polarizing plate 6, a dichroic mirror 7, a first curved mirror 9, a nonlinear crystal 10 and a second curved mirror 11; wherein, a pumping source 1 of the fiber laser emits laser in an absorption band of a single-mode gain fiber 3, and the laser enters the single-mode gain fiber 3 through a beam combiner 4 to form pump light of OPO; OPO pump light forms laser oscillation in a fiber laser resonant cavity formed by a fiber grating reflector 2, a single-mode gain fiber 3, a beam combiner 4, a collimating lens 5, a polarizing plate 6, a dichroic mirror 7, a first curved mirror 9, a nonlinear crystal 10 and a second curved mirror 11; the laser oscillated in the cavity passes through the nonlinear crystal 10, and OPO signal light and idler frequency light are generated; the OPO signal light forms oscillation in a resonant cavity formed by the dichroic mirror 7, the first curved mirror 9, the nonlinear crystal 10 and the second curved mirror 11, and the generated OPO idler frequency light is output through the first curved mirror and the second curved mirror.
Compared with the existing optical parametric oscillator for pumping in the cavity, the optical parametric oscillator for pumping in the cavity based on the optical fiber laser can provide better beam quality and higher power conversion efficiency; however, when the OPO is placed in the resonant cavity of the fiber laser, the Q value of the resonant cavity of the fiber laser is low due to the large coupling loss from the free space optical element to the fiber; therefore, compared with an optical parametric oscillator of pumping outside the cavity, the OPO is placed in the resonant cavity of the laser, the oscillation threshold of the OPO can only be reduced by a small amplitude, and the light spot area of an OPO signal and pumping light in the nonlinear crystal can be reduced by applying the curved mirror, so that the purpose of further reducing the oscillation threshold of the OPO is achieved; the second curved mirror 11 now serves as the end mirror of the OPO signal light and pump light resonator, while the dichroic mirror 7 serves as the other end mirror of the OPO signal light resonator.
As shown in fig. 2, an optical fiber laser intracavity pumped single-resonant optical parametric oscillator provided in embodiment 2 of the present invention includes: the optical fiber laser comprises a pumping source 1 of an optical fiber laser, a fiber grating reflector 2, a single-mode gain optical fiber 3, a beam combiner 4, a collimating lens 5, a polarizing plate 6, a dichroic mirror 7, an output coupling mirror 8, a first curved mirror 9, a nonlinear crystal 10 and a second curved mirror 11; the pump source 1 of the fiber laser emits laser in a single-mode gain fiber 3 absorption band, and the laser enters the single-mode gain fiber 3 through a beam combiner 4 to form pump light of OPO; OPO pump light forms laser oscillation in a fiber laser resonant cavity formed by a fiber grating reflector 2, a single-mode gain fiber 3, a beam combiner 4, a collimating lens 5, a polarizing plate 6, a dichroic mirror 7, a first curved mirror 9, a nonlinear crystal 10 and a second curved mirror 11; the laser oscillated in the cavity passes through the nonlinear crystal 10, and gains of OPO signal light and idler frequency light can be generated; the OPO signal light forms oscillation in a resonant cavity formed by an output coupling mirror 8, a dichroic mirror 7, a first curved mirror 9, a nonlinear crystal 10 and a second curved mirror 11, the generated OPO signal light is output through the output coupling mirror, and the generated OPO idler frequency light is output through the first curved mirror and the second curved mirror.
In contrast to embodiment 1, the output coupling mirror 8 is added, while the second curved mirror 11 acts as an end mirror for the OPO signal light and pump light resonator. The invention utilizes the output coupling mirror to increase the cavity length of the OPO signal optical cavity, can reduce the spot area of the OPO signal and the pumping light in the nonlinear crystal, and achieves the purpose of further reducing the OPO oscillation threshold.
As shown in fig. 3, a fiber laser intracavity pumped single-resonance optical parametric oscillator provided in embodiment 3 of the present invention includes: the device comprises a pumping source 1 of the fiber laser, a fiber grating reflector 2, a single-mode gain fiber 3, a beam combiner 4, a collimating lens 5, a polarizing plate 6, a dichroic mirror 7, a first curved mirror 9, a nonlinear crystal 10, a second curved mirror 11 and a high-reflection mirror 12; wherein, a pumping source 1 of the fiber laser emits laser in an absorption band of a single-mode gain fiber 3, and the laser enters the single-mode gain fiber 3 through a beam combiner 4 to form pump light of OPO; the OPO pump light forms laser oscillation in a fiber laser resonant cavity which is composed of a fiber grating reflector 2, a single-mode gain fiber 3, a beam combiner 4, a collimating lens 5, a polarizing plate 6, a dichroic mirror 7, a first curved mirror 9, a nonlinear crystal 10, a second curved mirror 11 and a high-reflection mirror 12; the laser oscillated in the cavity passes through the nonlinear crystal 10, and gains of OPO signal light and idler frequency light can be generated; the OPO signal light forms oscillation in a resonant cavity formed by the dichroic mirror 7, the first curved mirror 9, the nonlinear crystal 10, the second curved mirror 11 and the high reflecting mirror 12, and the generated OPO idler light is output through the first curved mirror and the second curved mirror.
In contrast to example 1, with the addition of the highly reflective mirror 12, the dichroic mirror 7 now serves as the end mirror of the OPO signal optical resonator. The invention utilizes the high-reflection mirror to increase the cavity length of the OPO signal optical cavity, can reduce the spot area of the OPO signal and the pump light in the nonlinear crystal, and achieves the purpose of further reducing the OPO oscillation threshold.
As shown in fig. 4, an optical fiber laser intracavity pumped single-resonant optical parametric oscillator provided in embodiment 4 of the present invention includes: the optical fiber laser comprises a pumping source 1 of an optical fiber laser, a fiber grating reflector 2, a single-mode gain optical fiber 3, a beam combiner 4, a collimating lens 5, a polarizing plate 6, a dichroic mirror 7, an output coupling mirror 8, a first curved mirror 9, a nonlinear crystal 10, a second curved mirror 11 and a high-reflection mirror 12; the pump source 1 of the fiber laser emits laser in a single-mode gain fiber 3 absorption band, and the laser enters the single-mode gain fiber 3 through a beam combiner 4 to form pump light of OPO; the OPO pump light forms laser oscillation in a fiber laser resonant cavity which is composed of a fiber grating reflector 2, a single-mode gain fiber 3, a beam combiner 4, a collimating lens 5, a polarizing plate 6, a dichroic mirror 7, a first curved mirror 9, a nonlinear crystal 10, a second curved mirror 11 and a high-reflection mirror 12; the laser oscillated in the cavity passes through the nonlinear crystal 10, and gains of OPO signal light and idler frequency light can be generated; the OPO signal light forms oscillation in a resonant cavity formed by an output coupling mirror 8, a dichroic mirror 7, a first curved mirror 9, a nonlinear crystal 10, a second curved mirror 11 and a high reflecting mirror 12, the generated OPO signal light is output through the output coupling mirror, and the generated OPO idler frequency light is output through the first curved mirror and the second curved mirror.
Compared with the embodiment 1, the high-reflection mirror 12 and the output coupling mirror 8 are added, the cavity length of the OPO signal optical cavity is increased by using the output coupling mirror and the high-reflection mirror, the spot areas of the OPO signal and the pump light in the nonlinear crystal can be reduced, and the purpose of further reducing the OPO oscillation threshold is achieved.
Those skilled in the art will appreciate that the drawings are merely schematic representations of several preferred embodiments. The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. An intracavity pump optical parametric oscillator using a fiber laser as a pump source, comprising: the device comprises a pumping source (1) of a fiber laser, a fiber grating reflector (2), a single-mode gain fiber (3), a beam combiner (4), a collimating lens (5), a polarizing plate (6), a dichroic mirror (7), a first curved mirror (9), a nonlinear crystal (10) and a second curved mirror (11);
a pumping source (1) of the optical fiber laser emits laser in a single-mode gain optical fiber absorption band, and the laser enters the single-mode gain optical fiber (3) through the beam combiner (4) to form OPO pumping light;
the OPO pump light forms laser oscillation in a first resonant cavity formed by the fiber grating reflector (2), the single-mode gain fiber (3), the beam combiner (4), the collimating lens (5), the polarizing plate (6), the dichroic mirror (7), the first curved mirror (9) and the second curved mirror (11);
the nonlinear crystal (10) is positioned in the first resonant cavity and is arranged between the first curved mirror (9) and the second curved mirror (11); the laser oscillating in the first resonant cavity generates OPO signal light and OPO idler frequency light through the nonlinear crystal (10);
the OPO signal light forms oscillation in a second resonant cavity formed by the dichroic mirror (7), the first curved mirror (9) and the second curved mirror (11), and the OPO idle frequency light is output through the first curved mirror (9) and the second curved mirror (11) respectively.
2. An intracavity pump optical parametric oscillator using a fiber laser as a pump source, comprising: the device comprises a pumping source (1) of a fiber laser, a fiber grating reflector (2), a single-mode gain fiber (3), a beam combiner (4), a collimating lens (5), a polarizing plate (6), a dichroic mirror (7), an output coupling mirror (8), a first curved mirror (9), a nonlinear crystal (10) and a second curved mirror (11);
a pumping source (1) of the optical fiber laser emits laser in a single-mode gain optical fiber absorption band, and the laser enters a single-mode gain optical fiber (3) through a beam combiner (4) to form OPO pumping light;
the OPO pump light forms laser oscillation in a first resonant cavity formed by the fiber grating reflector (2), the single-mode gain fiber (3), the beam combiner (4), the collimating lens (5), the polarizer (6), the dichroic mirror (7), the first curved mirror (9) and the second curved mirror (11);
the nonlinear crystal (10) is positioned in the first resonant cavity and is arranged between the first curved mirror (9) and the second curved mirror (11); the laser oscillating in the first resonant cavity generates OPO signal light and OPO idler frequency light through the nonlinear crystal (10);
the OPO signal light forms oscillation in a second resonant cavity formed by the output coupling mirror (8), the dichroic mirror (7), the first curved mirror (9) and the second curved mirror (11), the OPO signal light is output through the output coupling mirror (8), and the OPO idle frequency light is output through the first curved mirror (9) and the second curved mirror (11) respectively.
3. An intracavity pump optical parametric oscillator using a fiber laser as a pump source, comprising: the device comprises a pumping source (1) of a fiber laser, a fiber grating reflector (2), a single-mode gain fiber (3), a beam combiner (4), a collimating lens (5), a polarizing plate (6), a dichroic mirror (7), a first curved mirror (9), a nonlinear crystal (10), a second curved mirror (11) and a high-reflection mirror (12);
a pumping source (1) of the optical fiber laser emits laser in a single-mode gain optical fiber absorption band, and the laser enters a single-mode gain optical fiber (3) through a beam combiner (4) to form OPO pumping light;
the OPO pump light forms laser oscillation in a first resonant cavity formed by the fiber grating reflector (2), the single-mode gain fiber (3), the beam combiner (4), the collimating lens (5), the polarizer (6), the dichroic mirror (7), the first curved mirror (9), the second curved mirror (11) and the high-reflection mirror (12);
the nonlinear crystal (10) is positioned in the first resonant cavity and is arranged between the first curved mirror (9) and the second curved mirror (11); the laser oscillating in the first resonant cavity generates OPO signal light and OPO idler frequency light through the nonlinear crystal (10);
the OPO signal light forms oscillation in a second resonant cavity formed by the dichroic mirror (7), the first curved mirror (9), the second curved mirror (11) and the high-reflection mirror (12), and the OPO idle frequency light is output through the first curved mirror (9) and the second curved mirror (11) respectively.
4. An intracavity pump optical parametric oscillator using a fiber laser as a pump source, comprising: the device comprises a pumping source (1) of a fiber laser, a fiber grating reflector (2), a single-mode gain fiber (3), a beam combiner (4), a collimating lens (5), a polarizing plate (6), a dichroic mirror (7), an output coupling mirror (8), a first curved mirror (9), a nonlinear crystal (10), a second curved mirror (11) and a high-reflection mirror (12);
a pumping source (1) of the optical fiber laser emits laser in a single-mode gain optical fiber absorption band, and the laser enters a single-mode gain optical fiber (3) through the beam combiner (4) to form OPO pumping light;
the OPO pump light forms laser oscillation in a first resonant cavity formed by the fiber grating reflector (2), the single-mode gain fiber (3), the beam combiner (4), the collimating lens (5), the polarizer (6), the dichroic mirror (7), the first curved mirror (9), the second curved mirror (11) and the high-reflection mirror (12);
the nonlinear crystal (10) is positioned in the first resonant cavity and is arranged between the first curved mirror (9) and the second curved mirror (11); laser light oscillating in the first resonant cavity passes through the nonlinear crystal (10) to generate OPO signal light and idler frequency light;
the OPO signal light forms oscillation in a second resonant cavity formed by the output coupling mirror (8), the dichroic mirror (7), the first curved mirror (9), the nonlinear crystal (10), the second curved mirror (11) and the high-reflection mirror (12), the OPO signal light is output through the output coupling mirror (8), and the OPO idle frequency light is output through the first curved mirror (9) and the second curved mirror (11) respectively.
5. An intracavity pump optical parametric oscillator as claimed in any of claims 1 to 4 wherein the pump source (1) of the fibre laser is a single mode or multimode semiconductor laser, a solid state laser or a fibre laser.
6. The intracavity pumped optical parametric oscillator of any of claims 1 to 4, wherein the single-mode gain fiber (3) is a Nd-, Yb-, Er-, Tm-or Ho-doped single-or double-clad fiber.
7. The intracavity pump optical parametric oscillator of any of claims 1 to 4, wherein the combiner (4) is a wavelength division multiplexing combiner.
8. An intracavity pump optical parametric oscillator as claimed in any of claims 1 to 4 wherein the collimating lens (5) is arranged to achieve collimation of the laser light and to achieve matching with the spatial mode of the OPO pump resonator.
9. An intracavity pump optical parametric oscillator as claimed in any of claims 1 to 4 wherein the polariser (6) is arranged to select the laser polarisation direction of the fibre laser to meet the requirements of the nonlinear crystal for pump optical polarisation.
10. The intracavity pumped optical parametric oscillator of any of claims 1 to 4, wherein the nonlinear crystal (10) is a periodically poled lithium niobate crystal or a potassium titanyl phosphate crystal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710199713.9A CN106816807B (en) | 2017-03-30 | 2017-03-30 | Intracavity pump optical parametric oscillator using optical fiber laser as pump source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710199713.9A CN106816807B (en) | 2017-03-30 | 2017-03-30 | Intracavity pump optical parametric oscillator using optical fiber laser as pump source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106816807A CN106816807A (en) | 2017-06-09 |
| CN106816807B true CN106816807B (en) | 2020-02-14 |
Family
ID=59116356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710199713.9A Active CN106816807B (en) | 2017-03-30 | 2017-03-30 | Intracavity pump optical parametric oscillator using optical fiber laser as pump source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106816807B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107104352B (en) * | 2017-06-28 | 2023-09-08 | 中国工程物理研究院激光聚变研究中心 | Fiber laser and optical system |
| CN107994453B (en) * | 2017-12-29 | 2024-05-14 | 西南大学 | Tungsten disulfide phosphor QYb of laser diode pump: GYSO all-solid-state laser |
| CN109687274A (en) * | 2019-01-18 | 2019-04-26 | 南京邮电大学 | A kind of all solid laser for lasing 350nm laser |
| CN114156727A (en) * | 2021-10-26 | 2022-03-08 | 西安电子科技大学 | High-power intermediate infrared tunable femtosecond laser generating device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6108356A (en) * | 1999-03-05 | 2000-08-22 | Photonics Industries International, Inc. | Intracavity optical parametric oscillators |
| CN102842847A (en) * | 2012-09-13 | 2012-12-26 | 天津大学 | Intracavity single resonant optical parametric oscillator (ICSRO) |
| CN103715593A (en) * | 2014-01-06 | 2014-04-09 | 天津大学 | Single-frequency intermediate infrared light source system of 2-micron fiber laser pump |
| CN103872562A (en) * | 2014-03-27 | 2014-06-18 | 天津大学 | Inner-cavity single-resonance optical parametric oscillator of fiber laser pump |
| CN104064947A (en) * | 2014-07-03 | 2014-09-24 | 西安电子科技大学 | Femtosecond optical parameter oscillator for synchronous pump of all-solid-state mode-locking Yb laser |
-
2017
- 2017-03-30 CN CN201710199713.9A patent/CN106816807B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6108356A (en) * | 1999-03-05 | 2000-08-22 | Photonics Industries International, Inc. | Intracavity optical parametric oscillators |
| CN102842847A (en) * | 2012-09-13 | 2012-12-26 | 天津大学 | Intracavity single resonant optical parametric oscillator (ICSRO) |
| CN103715593A (en) * | 2014-01-06 | 2014-04-09 | 天津大学 | Single-frequency intermediate infrared light source system of 2-micron fiber laser pump |
| CN103872562A (en) * | 2014-03-27 | 2014-06-18 | 天津大学 | Inner-cavity single-resonance optical parametric oscillator of fiber laser pump |
| CN104064947A (en) * | 2014-07-03 | 2014-09-24 | 西安电子科技大学 | Femtosecond optical parameter oscillator for synchronous pump of all-solid-state mode-locking Yb laser |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106816807A (en) | 2017-06-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7535938B2 (en) | Low-noise monolithic microchip lasers capable of producing wavelengths ranging from IR to UV based on efficient and cost-effective frequency conversion | |
| US7535937B2 (en) | Monolithic microchip laser with intracavity beam combining and sum frequency or difference frequency mixing | |
| CN106816807B (en) | Intracavity pump optical parametric oscillator using optical fiber laser as pump source | |
| US20170104308A1 (en) | Solid-state laser device based on a twisted-mode cavity and a volume grating | |
| CN106814516B (en) | A kind of continuous wave optical parametric oscillator pumping resonance | |
| US7742509B2 (en) | Single-longitudinal mode laser with orthogonal-polarization traveling-wave mode | |
| CN107046222B (en) | Inner cavity optical parametric oscillator for realizing similar dual-wavelength output | |
| US20070041409A1 (en) | Injection locked high power laser systems | |
| CN101483317A (en) | Pump mode for semiconductor laser | |
| US9190798B2 (en) | Optical parametric oscillator with embedded resonator | |
| US7804865B2 (en) | Single-frequency monolithic linear laser device and system comprising same | |
| JP2008511182A (en) | Injection-locked high power laser system | |
| CN112290359A (en) | Double-resonant-cavity Raman laser | |
| US20020094006A1 (en) | Solid-state laser device and solid-state laser amplifier provided therewith | |
| CN115133389B (en) | Solid laser based on nonlinear amplifying annular mirror | |
| Hardman et al. | High-power diode-bar-pumped intracavity-frequency-doubled Nd: YLF ring laser | |
| US8649404B2 (en) | Compact and efficient visible laser source with high speed modulation | |
| US7633978B2 (en) | Frequency stabilized laser source | |
| JP4505462B2 (en) | Monolithic solid state laser device pumped by a laser diode and method of using this device | |
| US7269189B2 (en) | Coherent light source based on sum-frequency mixing | |
| Okhapkin et al. | Single-frequency intracavity doubled Yb: YAG ring laser | |
| RU2548388C1 (en) | Fibre laser with nonlinear radiation frequency conversion in high-q resonator (versions) | |
| CN112490836B (en) | Gas Raman laser based on annular unstable resonator | |
| CN221262952U (en) | Low-noise laser | |
| CN112993729B (en) | Low-quantum-loss 1.6-micrometer high-peak-power pumping source of medium-wave optical parametric oscillator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |