CN114976846A - Multi-band switchable pulse laser system with all-fiber structure - Google Patents
Multi-band switchable pulse laser system with all-fiber structure Download PDFInfo
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- CN114976846A CN114976846A CN202210363365.5A CN202210363365A CN114976846A CN 114976846 A CN114976846 A CN 114976846A CN 202210363365 A CN202210363365 A CN 202210363365A CN 114976846 A CN114976846 A CN 114976846A
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- 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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
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- 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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0085—Modulating the output, i.e. the laser beam is modulated outside the laser cavity
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- 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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06716—Fibre compositions or doping with active elements
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- 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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10061—Polarization control
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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention discloses a multi-band switchable pulse laser system with an all-fiber structure. The all-fiber structure multiband switchable pulse laser system comprises: the device comprises a pumping source, a wavelength division multiplexer, a rare earth ion doped optical fiber, a polarization correlation isolator, an optical fiber connector, a polarization controller and a light splitting coupler. The pump source injects pump light into the wavelength division multiplexer to provide energy for the system; the wavelength division multiplexer is used for coupling the laser in different wave bands; the rare earth ion doped optical fiber is used as a gain medium in a laser system; the polarization-dependent isolator is connected with the rare earth ion-doped optical fiber to ensure unidirectional transmission of laser in a laser system; the optical fiber connector is connected with the output end of the polarization-dependent isolator and the polarization controller, and can be connected with the corresponding waveband light path according to actual needs; the polarization controller adjusts the laser polarization state in the whole system by adjusting peripheral components; the output end of the polarization controller is connected with the second input end of the wavelength division multiplexer by the light splitting coupler, so that the whole system forms a loop, and part of laser can be led out of the cavity for testing or application.
Description
Technical Field
The invention relates to the technical field of laser, in particular to a multi-band switchable pulse laser system with an all-fiber structure.
Background
Laser technology development has gone on for over 60 years since the first ruby laser was introduced in 1960. In the sixty years, laser derives different wave bands, different working mechanisms, different powers and different carriers, various laser technologies are infinite and all flowers are in the same place, and the laser subject is also developed into a subject with the same science and application.
In the actual life of people, laser technology often faces different application scenes. For example, in the field of directed energy, industrial processing, high-energy lasers in the 1 μm band are typically required; in the field of laser medicine, lasers of 1.5 μm or 2 μm are generally in play; in the aspect of biological imaging, the laser of 1.7 μm is also very colorful.
According to the prior art, pulse lasers with different wave bands of 1 micron, 1.5 microns, 2 microns and the like cannot be freely switched and output in the same laser light path. Therefore, in an application scenario where multiband pulse laser is required, multiple sets of laser systems are required to obtain pulse laser of different wavebands, resulting in high overall application cost, inconvenience in use, and difficulty in carrying.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, the multi-band switchable pulse laser system with the all-fiber structure is provided, and the output of pulse lasers in different bands can be realized according to application requirements.
The technical scheme of the invention is as follows: an all-fiber multi-band switchable pulsed laser system comprising: the device comprises a pumping source, a wavelength division multiplexer, a rare earth ion doped optical fiber, a polarization correlation isolator, an optical fiber connector, a polarization controller, a light splitting coupler and a light outlet port; the pump source injects pump light into the wavelength division multiplexer through a first input end of the wavelength division multiplexer to provide energy for the whole system; coupling the lasers in different wave bands by a wavelength division multiplexer; the rare earth ion doped optical fiber is connected with the output end of the wavelength division multiplexer and is used as a gain medium in the laser system, and is connected with the corresponding rare earth ion doped optical fiber through a polarization-dependent isolator to ensure unidirectional transmission of laser in the laser system; the optical fiber connector is connected with the output end of the polarization-related isolator and the input end of the polarization controller, and the optical fiber connector is used for connecting the optical path of the corresponding waveband according to actual needs; the polarization controller adjusts the laser polarization state in the whole system by adjusting peripheral components; the output end of the polarization controller is connected with the second input end of the wavelength division multiplexer by the light splitting coupler, so that the whole system forms a loop, and meanwhile, part of laser is led out of the cavity through the output port to be tested or applied.
The pumping source adopts semiconductor laser pumping or all-fiber laser pumping.
The rare earth ion-doped optical fiber adopts all rare earth ion-doped optical fibers which can be applied to laser generation.
The rare earth ion doped optical fiber comprises ytterbium Yb doped, erbium Er doped, thulium doped Tm doped, holmium doped Ho or praseodymium doped Pr.
The working wave band of the polarization-dependent isolator is matched with the working wave band of the fused rare earth ion-doped optical fiber.
The optical fiber connector adopts a device capable of realizing free output switching of multiple paths of light in one optical fiber according to requirements, and the device comprises a multi-port flange structure or an active connector or an optical switch.
The middle port of the multi-port flange is a through port, the front side of the multi-port flange is a front-end laser input port, and the back side of the multi-port flange is a back-end laser output port.
A plurality of optical fiber jumper wire head placing ports are distributed around the front-end laser input port, and the number of the ports is set according to needs.
The polarization controller adopts a device capable of controlling the polarization state of the laser in the light path, and comprises a three-ring polarization controller or a cylindrical polarization controller.
The optical splitting coupler is a 1 x (1+ N) structural type optical splitting coupler and comprises an input end and (1+ N) output ports, and a first output end of the output ports is welded with a second input end of the wavelength division multiplexer; the other N output ends are arranged according to the requirement.
The beneficial effects of the invention are: in the prior art, a ring laser oscillation cavity structure is generally adopted to pump a certain gain medium, and the nonlinear polarization rotation effect is utilized to realize the pulse laser output of a certain waveband. The invention adopts the special optical fiber connector, integrates various gain media in the same laser system, can realize the free switching of multiband pulse laser in the same laser system, and can effectively reduce the use cost and the system complexity compared with the prior art.
Meanwhile, the specially designed multi-port flange can be subjected to port layout design according to needs, and is characterized in that the middle port is a through port, the front side is a front-end laser input port, and the back side is a back-end laser output port. In addition, a plurality of optical fiber jumper wire head placing ports are distributed around the front laser input port, and the number of the ports can be set according to requirements. The flexibility of the whole set of system is greatly improved, and the laser system has certain expansion potential.
In addition, the polarization controller (10) in the invention adopts a device capable of controlling the polarization state of the laser in the light path, and comprises a three-ring type polarization controller or a cylindrical type polarization controller. The three-ring type polarization controller can adjust the three ring structures to adjust the polarization state, the cylindrical polarizer can adjust the polarization state by adjusting the pressure and the torsion of the optical fiber, and compared with the prior art, the method for adjusting the polarization state is more convenient and effective.
Drawings
FIG. 1 is a diagram of an all-fiber multi-band switchable pulsed laser system according to an embodiment of the present invention;
FIG. 2 is a schematic front view of a flange structure of a particular design in an embodiment of the present invention;
FIG. 3 is a schematic view of the back side of a flange structure of a particular design in an embodiment of the present invention;
FIG. 4 is a schematic diagram of an active fiber optic connector according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an optical switch in an embodiment of the invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to fig. 1-5.
The working principle of the system is that based on the fact that optical fibers doped with different rare earth ions have different light-emitting wave bands, a specially designed light path and a connector are combined, the principle of nonlinear polarization rotation is utilized, pulse lasers with different wave bands can be generated in a laser system, and wave band switching can be carried out according to actual use requirements.
The all-fiber multiband switchable pulse laser system comprises:
the device comprises a pumping source 1, a wavelength division multiplexer 2, a rare earth ion doped fiber 3, a rare earth ion doped fiber 4, a rare earth ion doped fiber 5, a polarization correlation isolator 6, a polarization correlation isolator 7, a polarization correlation isolator 8, a connector 9, a polarization controller 10, a light splitting coupler 11 and a light outlet port 12.
The pump source 1 injects pump light into the wavelength division multiplexer 2 through a first input end of the wavelength division multiplexer to provide energy for the whole system; the wavelength division multiplexer 2 is used for coupling the laser of different wave bands; the rare earth ion doped optical fibers 3, 4 and 5 are gain media in a laser system; polarization- dependent isolators 6, 7 and 8 are connected with corresponding rare earth ion-doped optical fibers to ensure unidirectional transmission of laser in a laser system; the optical fiber connector 9 is connected with the output end of the polarization-dependent isolator and the input end of the polarization controller 10; the optical fiber connector 9 can be used for connecting the optical paths of the corresponding wave bands according to actual requirements; the polarization controller 10 adjusts the polarization state of the laser in the whole system by adjusting the peripheral components; the output end of the polarization controller 10 is connected with the second input end of the wavelength division multiplexer 2 by the optical splitter 11, so that the whole system forms a loop, and meanwhile, part of laser can be led out of the cavity through the output port 12 for testing or application.
The pumping source 1 in the all-fiber structure multiband switchable pulse laser system is a semiconductor laser pump or an all-fiber laser pump or other pumping sources capable of providing energy.
The wavelength division multiplexer 2 in the all-fiber structure multiband switchable pulse laser system at least comprises a first input end, a second input end and a plurality of output ends which are arranged according to actual requirements, and the output ends are directly welded with the rare earth ion doped optical fiber.
The rare earth ion doped optical fibers 3, 4 and 5 in the all-fiber-structure multiband switchable pulse laser system can be all rare earth ion doped optical fibers which can be applied to laser generation, such as ytterbium (Yb), erbium (Er), thulium (Tm), holmium (Ho) and praseodymium (Pr), and the corresponding gain optical fibers are selected to be fused with the output end of the wavelength division multiplexer 2 according to the required wavelength band in actual use.
The working wave bands of polarization- dependent isolators 6, 7 and 8 in the all-fiber-structure multiband switchable pulsed laser system are matched with the working wave bands of the fused rare-earth-ion-doped optical fibers.
The fiber connector 9 in the all-fiber-structure multiband switchable pulse laser system can be a specially designed flange structure, and can also be an active fiber connector or an optical switch or other devices capable of realizing free output switching of multiple paths of light in one fiber according to requirements.
The polarization controller 10 in the all-fiber-structure multiband switchable pulsed laser system is a device capable of controlling the polarization state of laser in a light path, can be a three-ring polarization controller or a cylindrical polarization controller, and adjusts the polarization state of the laser in a laser cavity by adjusting the position and pressure of peripheral parts of the polarization controller.
The optical splitter 11 in the all-fiber-structure multiband switchable pulse laser system is a 1 x (1+ N) structure type optical splitter, and comprises an input end and (1+ N) output ports, wherein a first output end in the output ports needs to be welded with a second input end of the wavelength division multiplexer. The other N output ends can be arranged according to the requirement, and the pulse laser in the laser system can be led out of the cavity to be tested or applied.
On the basis of the above-described embodiment, various modified embodiments are further proposed, and it is to be noted herein that, in order to make the description brief, only the differences from the above-described embodiment are described in the various modified embodiments.
Example 1
As shown in fig. 1, the rare-earth ion-doped optical fibers 3, 4, 5 may be ytterbium (Yb), erbium (Er), thulium (Tm) doped rare-earth ion fibers. Through the specially designed fiber flange structure, as shown in the attached fig. 2 and 3, the pulse laser output of 1 μm, 1.5 μm and 2 μm can be realized. The method comprises the following specific steps: respectively welding ytterbium (Yb), erbium (Er) and thulium (Tm) doped optical fibers into the corresponding positions of the rare earth ion doped optical fibers 3, 4 and 5, and then welding polarization- related isolators 6, 7 and 8 corresponding to the working wavelength bands. The outputs of the polarization dependent isolators 6, 7, 8 are connected to optical fibre jumpers respectively and inserted 912, 913, 914 on the specially designed flange 91 of figure 2. And a jumper wire is inserted into a 915 port on the back surface of the flange structure with special design as shown in figure 3, so that the function of leading out laser is achieved. In practical application, according to practical requirements: if pulse laser with a wave band of 1 μm is needed, pulling out a jumper wire inserted into a port 912 and inserting the jumper wire into a port 911, so that a pumping source 1, a wavelength division multiplexer 2, an ytterbium (Yb) doped optical fiber 3, a polarization-related isolator 6, a specially designed flange structure 91, a polarization controller 10 and a light splitting coupler 11 form a ring structure, and then adjusting the polarization controller to obtain the pulse laser with the wave band of 1 μm at an output end 12; if pulse laser with a wave band of 1.5 microns is needed, a jumper inserted into a port 913 is pulled out and inserted into a port 911, so that the pumping source 1, the wavelength division multiplexer 2, the erbium (Er) -doped optical fiber 4, the polarization-related isolator 7, the specially designed flange structure 91, the polarization controller 10 and the optical splitting coupler 11 form a ring structure, and then the pulse laser with the wave band of 1.5 microns can be obtained at an output end 12 by adjusting the polarization controller; and if pulse laser with a wave band of 2 microns is needed, pulling out a jumper wire inserted into a port 913 and inserting the jumper wire into a port 911, so that the pumping source 1, the wavelength division multiplexer 2, the thulium (Tm) doped optical fiber 5, the polarization-related isolator 8, the specially designed flange structure 91, the polarization controller 10 and the optical splitting coupler 11 form a ring structure, and then the pulse laser with the wave band of 2 microns can be obtained at an output end 12 by adjusting the polarization controller. In the specially designed flange 91, 917, 918 and 919 are nut fixing holes.
Example 2:
as shown in fig. 4, the actively controlled fiber optic connector 92 may splice the input ends 921, 922, 923 to the output ends of the polarization dependent isolator 6, the polarization dependent isolator 7, and the polarization dependent isolator 8. The active controller 926 is then used via the transmission line 925 to artificially and actively select the laser output from the output 924 from the inputs 921, 922, 923, thereby looping the system and generating laser oscillation. By adjusting the polarization controller 10, the output end 12 can obtain the pulse laser with the corresponding wave band.
Example 3:
as shown in fig. 5, the optical switch 93 may fuse the input terminals 931, 932, 933 with the output terminals of the polarization dependent isolator 6, the polarization dependent isolator 7, the polarization dependent isolator 8. The laser output from the output 924 can be selected by controlling the on/off of the inputs 931, 932, 933 of the optical switch 93, so that the system forms a ring laser loop, and laser oscillation is generated in the ring cavity. By adjusting the polarization controller 10, the pulse laser with the corresponding wave band can be obtained at the output end 12.
By adopting the embodiment of the invention, the output switching of the multiband pulse laser can be realized by using a relatively compact structure, and the convenience of applying different band pulse lasers in different scenes is greatly improved.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention.
Claims (10)
1. An all-fiber multi-band switchable pulsed laser system, comprising: the device comprises a pumping source (1), a wavelength division multiplexer (2), a rare earth ion doped optical fiber, a polarization correlation isolator, an optical fiber connector (9), a polarization controller (10), an optical splitting coupler (11) and an optical outlet port (12); the pump source (1) injects pump light into the wavelength division multiplexer (2) through a first input end of the wavelength division multiplexer (2) to provide energy for the whole system; the wavelength division multiplexer (2) couples the laser of different wave bands; the rare earth ion doped optical fiber is connected with the output end of the wavelength division multiplexer (2) and is used as a gain medium in the laser system, and is connected with the corresponding rare earth ion doped optical fiber through a polarization-related isolator to ensure unidirectional transmission of laser in the laser system; the optical fiber connector (9) is connected with the output end of the polarization-related isolator and the input end of the polarization controller (10), and the optical fiber connector (9) is used for connecting the optical path of the corresponding waveband according to actual needs; the polarization controller (10) adjusts the polarization state of the laser in the whole system by adjusting the peripheral components; the output end of the polarization controller (10) is connected with the second input end of the wavelength division multiplexer (2) through the light splitting coupler (11), so that the whole system forms a loop, and meanwhile, part of laser is led out of the cavity through the light outlet port (12) to be tested or applied.
2. The all-fiber multiband switchable pulsed laser system of claim 1, wherein the pump source (1) is semiconductor laser pumping or all-fiber laser pumping.
3. The all-fiber multiband switchable pulsed laser system of claim 1, wherein the rare-earth-ion-doped fiber is all rare-earth-ion-doped fiber capable of being applied for laser generation.
4. The all-fiber multiband switchable pulsed laser system of claim 3, wherein the rare-earth ion-doped fiber comprises Yb doped with Yb, Er doped with Er, Tm doped with Tm, Ho doped with Ho, or Pr doped with Pr.
5. The all-fiber multiband switchable pulsed laser system of claim 1, wherein the polarization dependent isolator has an operating band matched to the operating band of the fused rare earth ion doped fiber.
6. The all-fiber multiband switchable pulsed laser system of claim 1, wherein the fiber connector (9) is a device capable of freely switching the output of multiple paths of light in one fiber according to the requirement, and comprises a multi-port flange structure or an active connector or an optical switch.
7. The all-fiber multiband switchable pulsed laser system of claim 6, wherein the multi-port flange has a through port at its middle port, a front laser input port at its front side, and a rear laser output port at its back side.
8. The all-fiber multiband switchable pulsed laser system of claim 7, wherein a plurality of fiber jumper placement ports are distributed around the front-end laser input port, and the number of ports is set as required.
9. The all-fiber multiband switchable pulsed laser system of claim 1, wherein the polarization controller (10) is a device capable of controlling the polarization state of the laser in the optical path, and comprises a three-ring type polarization controller or a cylindrical type polarization controller.
10. The all-fiber multiband switchable pulsed laser system of claim 1, wherein the optical splitter (11) is a 1 x (1+ N) structure type optical splitter, and comprises an input port and (1+ N) output ports, and a first output port of the output ports is fused with a second input port of the wavelength division multiplexer (2); the other N output ends are arranged according to the requirement.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210363365.5A CN114976846A (en) | 2022-04-07 | 2022-04-07 | Multi-band switchable pulse laser system with all-fiber structure |
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| CN202210363365.5A CN114976846A (en) | 2022-04-07 | 2022-04-07 | Multi-band switchable pulse laser system with all-fiber structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115663584A (en) * | 2022-11-21 | 2023-01-31 | 武汉中科锐择光电科技有限公司 | Raman fiber laser generation device and method for three-photon microscopic imaging |
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2022
- 2022-04-07 CN CN202210363365.5A patent/CN114976846A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115663584A (en) * | 2022-11-21 | 2023-01-31 | 武汉中科锐择光电科技有限公司 | Raman fiber laser generation device and method for three-photon microscopic imaging |
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