CN111864516A - Narrow-linewidth all-fiber cascade 4.66 mu m optical fiber gas laser with oscillator structure - Google Patents

Narrow-linewidth all-fiber cascade 4.66 mu m optical fiber gas laser with oscillator structure Download PDF

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CN111864516A
CN111864516A CN202010470435.8A CN202010470435A CN111864516A CN 111864516 A CN111864516 A CN 111864516A CN 202010470435 A CN202010470435 A CN 202010470435A CN 111864516 A CN111864516 A CN 111864516A
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fiber
gas
optical fiber
laser
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CN111864516B (en
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王泽锋
崔宇龙
周智越
黄威
李�昊
李智贤
王蒙
陈子伦
李霄
陈金宝
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National University of Defense Technology
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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
    • H01S3/02—Constructional details
    • H01S3/03—Constructional details of gas laser discharge tubes
    • H01S3/0315—Waveguide lasers
    • 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
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • H01S3/08013—Resonator comprising a fibre, e.g. for modifying dispersion or repetition rate
    • 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
    • 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
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/22—Gases
    • H01S3/223—Gases the active gas being polyatomic, i.e. containing two or more atoms
    • H01S3/2232—Carbon dioxide (CO2) or monoxide [CO]

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  • Chemical Kinetics & Catalysis (AREA)
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Abstract

The invention provides a narrow-linewidth all-fiber cascade 4.66 mu m optical fiber gas laser with an oscillator structure. The pump comprises a pump source, an input solid optical fiber, a first gas cavity, an anti-resonance hollow optical fiber, a second gas cavity and an output solid optical fiber. The first input fiber Bragg grating and the second input fiber Bragg grating are engraved on the input solid core fiber, the first output fiber Bragg grating and the second output fiber Bragg grating are engraved on the output solid core fiber, and the two pairs of fiber Bragg gratings form an oscillator structure. CO and buffer gas with proper pressure are filled in the anti-resonance hollow-core optical fiber. The 1.5 mu m wave band pump laser interacts with CO gas filled in the fiber core in the anti-resonance hollow fiber, and generates 4.66 mu m laser output through two-stage cascade stimulated radiation transition under the oscillator structure. The invention adopts the full optical fiber structure to realize the optical fiber laser output of 4.66 mu m, simultaneously simplifies the structure, reduces the volume of the laser and leads the laser to be more convenient and faster.

Description

Narrow-linewidth all-fiber cascade 4.66 mu m optical fiber gas laser with oscillator structure
Technical Field
The invention belongs to the technical field of fiber laser, and particularly relates to a mid-infrared narrow-linewidth fiber gas laser with an oscillator structure.
Background
The mid-infrared band laser with the wave band of 3-5 microns is positioned in a transmission window of the atmosphere, can be used for communication, biological medical treatment and environmental monitoring in the civil field, can be used for photoelectric countermeasure and missile tail flame detection in the military field, and is widely concerned by scientists.
At present, the means for generating the mid-infrared laser mainly comprises a quantum cascade laser, a solid laser, a gas laser, an optical parametric amplifier, a fiber laser and the like. The output bandwidth of the quantum cascade laser is very wide, and miniaturization can be realized, but the requirement on the processing level is very high, the current threshold is large, the beam quality is poor, and the quantum cascade laser generally needs to work at low temperature. The solid laser has compact structure and small volume, but is limited by doping ions, doping technology and other reasons, the output wavelength of the solid laser is difficult to expand, and the efficiency and the power are generally low. The damage threshold of the gas laser is very large, the output power can reach megawatt level, but the gas laser is large in size and complex in system, and is not beneficial to practical application. The optical parametric oscillator has a wide range A tuning range and can achieve high power narrow linewidth laser output, but it typically requires high pump intensity and has high requirements for nonlinear crystals and optics within the system. The optical fiber laser is hopeful to realize portable, stable and efficient intermediate infrared laser output due to the characteristics of good beam quality, good heat dissipation, high efficiency and the like. The existing doped ion for generating the intermediate infrared is mainly Er3+、Ho3+And Dy3+Etc., but it is difficult to exceed 4 μm due to the self-termination effect of the dopant ions and the limitation of the gain band thereof. The currently commonly used mid-infrared soft glass fiber is a ZBLAN fiber, the long-wavelength end of the transmission band of which is about 4.5 μm, cannot satisfy the further expansion of the wavelength to the long-wavelength mid-infrared region, while chalcogenide glass has a transmission window edge of up to 9 μm, but the rare earth ions have low solubility in this material. Meanwhile, the development of the mid-infrared fiber laser is limited by the problems of low damage threshold of the soft glass fiber, strict requirement on working temperature and the like.
The optical fiber gas laser uses hollow optical fiber as a laser transmission carrier, uses gas molecules as a gain medium, combines the advantages of the optical fiber laser and the gas laser, has longer acting distance, good beam quality, good heat dissipation characteristic and higher damage threshold, and can replace different types of gain gases (such as CO) 2CO, HF, etc.) output mid-infrared laser light of different wavelengths. However, the conventional gas laser is bulky and inconvenient to carry, which is not beneficial to practical application. In addition, the existing optical fiber gas lasers based on hollow optical fibers are all in a space structure, and are not all made into optical fibers. Further simplification of the structure of the fiber gas laser is becoming a necessary trend for further development thereof.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a narrow-linewidth all-fiber cascade 4.66 mu m fiber gas laser with an oscillator structure. The invention adopts an all-fiber structure to realize the output of the fiber laser with 4.66 mu m.
In order to achieve the technical purpose, the invention adopts the following specific technical scheme:
the narrow-linewidth all-fiber cascade 4.66 mu m optical fiber gas laser with the oscillator structure comprises a pumping source, an input solid core optical fiber, a first gas cavity, an anti-resonance hollow optical fiber, a second gas cavity and an output solid core optical fiber, wherein the pumping source is a tunable narrow-linewidth laser light source with a waveband of 1.5 mu m and is used for generating pumping laser; the output end of the pump source is connected with the input end of the input solid fiber, and a first input fiber Bragg grating and a second input fiber Bragg grating are engraved on the input solid fiber; two ends of the anti-resonance hollow-core optical fiber are respectively sealed in the first gas cavity and the second gas cavity in a vacuum manner; in the first gas cavity, the output end of the input solid core optical fiber is in coupling connection with the input end of the anti-resonance hollow core optical fiber after tapering; in the second gas cavity, the input end of the output solid optical fiber is in coupling connection with the output end of the anti-resonance hollow optical fiber after tapering, and the output end of the output solid optical fiber extends out of the second gas cavity; the first gas cavity or the second gas cavity is connected with a vacuumizing and inflating system, and the vacuumizing and inflating system is used for vacuumizing and inflating carbon monoxide gas and buffer gas with certain air pressure into the gas cavity and the fiber cores of the anti-resonance hollow-core optical fibers; a first output fiber Bragg grating and a second output fiber Bragg grating are engraved on the output solid core fiber; the first input fiber Bragg grating and the second output fiber Bragg grating form a pair of fiber Bragg gratings, the second input fiber Bragg grating and the first output fiber Bragg grating form a pair of fiber Bragg gratings, and the two pairs of fiber Bragg gratings form an oscillator structure. The working gas (i.e. gain medium) filled in the antiresonant hollow-core fiber is carbon monoxide.
The first gas cavity or the second gas cavity is connected with a vacuum-pumping and inflating system. The vacuumizing and inflating system is used for vacuumizing the corresponding gas cavity and inflating carbon monoxide gas and buffer gas with certain gas pressure into the gas cavity and the fiber core of the anti-resonance hollow-core optical fiber. The carbon monoxide gas and the buffer gas with certain air pressure are filled into the fiber core of the anti-resonance hollow-core optical fiber through a vacuum and inflation system, and the absorption line width of CO gas molecules is increased through collision broadening among gas molecules, so that the CO gas molecules cover the wavelength of the pump laser. The pumping laser output by the pumping source is adjusted to the central position of the absorption line of CO, the pumping laser with the wave band of 1.5 mu m interacts with carbon monoxide gas filled in the fiber core in the anti-resonance hollow fiber, and CO gas molecules are subjected to two-stage cascade stimulated radiation transition under the oscillator structure to generate 4.66 mu m laser output.
In the invention, the buffer gas is used for increasing the air pressure in the system, and simultaneously, the absorption line width of CO gas molecules is increased through collision broadening among gas molecules. The buffer gas is helium, argon or methane, etc. The buffer gas is filled into the anti-resonance hollow-core optical fiber through the gas cavity, so that on one hand, the pressure difference between the inside and the outside of the anti-resonance hollow-core optical fiber can be reduced, the air tightness of the system can be increased, meanwhile, the collision among gas molecules can be enhanced, and the absorption line width of CO gas molecules can be increased. The vacuumizing and inflating system comprises a vacuum pump, a CO gas cylinder, a buffer gas cylinder, a gas pressure regulating valve, a barometer and the like, and the corresponding gas cavity is vacuumized through the vacuum pump. The air pressure regulation and monitoring of the CO gas and the buffer gas in the anti-resonance hollow-core optical fiber can be realized through the CO gas cylinder, the air pressure regulation valve and the air pressure gauge on the CO gas circuit, the buffer gas cylinder, the air pressure regulation valve and the air pressure gauge on the buffer gas circuit.
In the invention, the working gas is carbon monoxide gas, and the 1.5 μm laser can generate 4.66 μm secondary laser output through two-stage cascade transition by the stimulated radiation transition of carbon monoxide gas molecules. Further, the purity of the carbon monoxide gas is more than 99.99%.
The pump source is a tunable narrow linewidth laser source with a wave band of 1.5 mu m (namely the central wavelength is between 1500nm and 1600nm (does not contain 1600 nm)). Preferably, the pump source is a tunable narrow-linewidth high-power pulse or continuous laser light source with a central wavelength of 1566nm, 1568nm, 1583nm or 1588nm, the four wavelengths are the four wavelengths with the first-order light emission and the second-order absorption wavelength closest to each other, which are most easily realized, at present, the absorption linewidth is increased to be about 0.2nm at the maximum by filling buffer gas in the 2 μm waveband, so that the absorption wavelength difference is more suitable to be less than 0.2nm, and the wavelength difference between the other wavelength pumped wavelengths in the 1.5 μm waveband and the second-order pump wavelength is generally larger than the value, which can be more difficult to realize than the four wavelengths.
Furthermore, the input solid core optical fiber adopts the intermediate infrared soft glass optical fiber, and has lower transmission loss in a 1.5 mu m wave band. The tail end of the input solid core optical fiber is connected with the input end of the anti-resonance hollow optical fiber in a tapering coupling mode so as to increase the mode field diameter of the input solid core optical fiber and be convenient to match with the mode field diameter of the anti-resonance hollow optical fiber. The output solid core optical fiber is a middle infrared soft glass optical fiber. The input end of the output solid core optical fiber is connected with the output end of the anti-resonance hollow optical fiber in a tapering coupling mode so as to increase the mode field diameter of the output solid core optical fiber and be convenient to match with the mode field diameter of the anti-resonance hollow optical fiber.
Furthermore, the antiresonant hollow-core optical fiber has lower transmission loss at the positions of 1.5 mu m wave band, 2.33 mu m and 4.66 mu m, the transmission loss of the antiresonant hollow-core optical fiber to the pump laser of the 1.5 mu m wave band is less than 0.05dB/m, the transmission loss of the antiresonant hollow-core optical fiber to the laser of the 2.33 mu m wave band is less than 0.1dB/m, and the transmission loss of the antiresonant hollow-core optical fiber to the laser of the 4.66 mu m wave band is less than 0.15dB/m, so that a good carrier is provided for the cascade stimulated radiation transition.
Further, each gas chamber has a smaller volume. Wherein the first gas cavity and the second gas cavity can realize the fixation of the coupling part of the solid core optical fiber and the anti-resonance hollow core optical fiber. An air hole is reserved on the side surface of the first gas cavity or the second gas cavity and is used for being connected with a vacuumizing and inflating system, so that the gas cavity is vacuumized conveniently, and carbon monoxide gas and buffer gas are inflated conveniently.
Further, the anti-resonance hollow-core optical fiber is an ice cream type anti-resonance hollow-core optical fiber or a node-free type anti-resonance hollow-core optical fiber.
Further, the first input fiber Bragg grating and the second input fiber Bragg grating are directly written on the input solid core fiber. The first and second input fiber bragg gratings have a reflectivity of 98% or more for 4.66 μm and 2.33 μm lasers. The first output fiber Bragg grating and the second output fiber Bragg grating are directly inscribed on the output solid core fiber. The first output fiber Bragg grating has a reflectivity of 98% or more for 2.33 μm laser light. The second output fiber bragg grating has a transmission of 10% -90% for a 4.66 μm laser.
The invention has the following beneficial effects:
1. the tunable narrow linewidth laser light source with the wave band of 1.5 mu m (namely the central wavelength is between 1500nm and 1600nm (not containing 1600 nm)) is used as a pumping source, CO gas is used as a gain medium, and further, buffer gas is adopted, wherein the buffer gas is helium, argon or methane and the like and is filled into the anti-resonance hollow-core optical fiber, so that on one hand, the pressure difference between the inside and the outside of the anti-resonance hollow-core optical fiber can be reduced, the air tightness of the system can be increased, meanwhile, the collision among gas molecules can be enhanced, and the absorption linewidth of the CO gas molecules can be increased. In the oscillator structure, the pump light near 1.5 mu m is enabled to cascade to generate 4.66 mu m laser output through the stimulated radiation transition of CO gas molecules, a pump source is easy to obtain, and the output wavelength is larger than that of the existing optical fiber laser output doped with rare earth ions.
2. The invention adopts the anti-resonance hollow optical fiber as the place for the interaction of the laser and the carbon monoxide gas, and the action area is limited to be only 100 mu m2The core region greatly increases the action strength.
3. The invention adopts the full optical fiber structure to realize the optical fiber laser output of 4.66 mu m, realizes the full optical fiber structure of the optical fiber gas laser based on the hollow optical fiber by utilizing the coupling mode of the solid core optical fiber taper and the hollow optical fiber, and simultaneously adopts the structure of the oscillator to realize two-stage cascade on one self-designed hollow optical fiber, thereby further simplifying the structure, reducing the volume of the laser and leading the laser to be more convenient.
4. The invention can respectively realize the output of continuous and pulse 4.66 mu m narrow linewidth optical fiber gas laser.
Drawings
FIG. 1 is a cross-sectional electron microscope of an ice cream type antiresonant hollow-core optical fiber;
FIG. 2 is a cross-sectional electron microscope of an anti-resonant hollow-core fiber without nodes;
FIG. 3 is a schematic view of the entire structure of embodiment 1;
FIG. 4 is a schematic diagram of a detailed structure of tapered coupling of a solid-core fiber and an anti-resonance hollow-core fiber;
reference numbers in the figures: 1 is a pumping source; 2 is an input solid fiber; 3 is a first gas chamber; 4 is a first gas cavity inlet; 5 is the connection point of the input solid core optical fiber and the anti-resonance hollow core optical fiber; 6 is an anti-resonance hollow fiber; 7 is an output solid core optical fiber; 8 is a second gas cavity; 9 is the connection point of the output solid core optical fiber and the anti-resonance hollow core optical fiber; 10 is a first input fiber bragg grating; 11 is a second input fiber bragg grating; 12 is a first output fiber Bragg grating; and 13 is a second output fiber bragg grating.
Detailed Description
In order to make the technical scheme and advantages of the present invention more clearly understood, the present invention is further described in 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. 3, the present embodiment provides a narrow-linewidth all-fiber cascade 4.66 μm fiber gas laser with an oscillator structure, which includes a pump source 1, an input solid-core fiber 2, a first gas cavity 3, an antiresonant hollow-core fiber 6, an output solid-core fiber 7, and a second gas cavity 8. The anti-resonance hollow-core optical fiber 6 is an ice cream type anti-resonance hollow-core optical fiber or a node-free type anti-resonance hollow-core optical fiber. Referring to fig. 1, fig. 1 is a cross-sectional electron microscope image of an ice cream type antiresonant hollow-core optical fiber. Referring to fig. 2, 2 is a cross-sectional electron microscope image of the node-free type anti-resonance hollow-core optical fiber. The input solid optical fiber and the output solid optical fiber both adopt intermediate infrared soft glass optical fibers.
The pump source 1 is a tunable narrow linewidth laser light source with a wave band of 1.5 mu m and is used for generating pump laser. The light source output fiber of the pump source 1 is fused with the input solid core fiber 2. The two ends of the first-stage anti-resonance hollow-core optical fiber 6 are respectively sealed in the first gas cavity 3 and the second gas cavity 8 in vacuum. The end of the input solid core fiber 2 is coupled with the input end of the anti-resonance hollow core fiber 6 by means of taper coupling and sealed in the first gas cavity 3. The first gas chamber 3 has a small volume, and the first gas chamber 3 can fix the coupling portion of the input solid core optical fiber 2 and the antiresonant hollow core optical fiber 6. The tail end of the input solid optical fiber 2 is subjected to tapering treatment, the mode field diameter of the input solid optical fiber is matched with that of the anti-resonance hollow optical fiber 6, the tapered tail end of the input solid optical fiber 2 is inserted into the fiber core of the input end of the anti-resonance hollow optical fiber 6, and the fiber core is adjusted to a proper position and sealed and fixed by the first gas cavity 3. The connection point 5 of the input solid core fiber to the anti-resonant hollow core fiber is located in the first gas chamber 3. The first gas chamber 3 is provided with a first gas chamber inlet 4 on its side for connecting with a vacuum-pumping and gas-filling system, so as to evacuate the first gas chamber 3 and fill the appropriate pressure of carbon monoxide gas and buffer gas. The buffer gas is used for increasing the air pressure in the system and simultaneously increasing the absorption line width of CO gas molecules. The buffer gas is helium, argon or methane, etc. The anti-resonance hollow-core optical fiber 6 is filled with carbon monoxide gas and buffer gas at a certain pressure through a vacuum-pumping and gas-filling system connected with the first gas cavity 3, and the absorption line width is increased through collision broadening among gas molecules, so that the absorption line width covers the wavelength of the pump laser.
The output solid core optical fiber 7 is a middle infrared soft glass optical fiber. The input end of the output solid core optical fiber 7 is also tapered to match the mode field diameter of the anti-resonance hollow core optical fiber 6, the tapered output solid core optical fiber 7 is inserted into the fiber core of the output end of the anti-resonance hollow core optical fiber 6 and is adjusted to a proper position, and the second gas cavity 8 is used for fixing and sealing. The output end of the anti-resonance hollow-core optical fiber 6 is coupled with the output solid-core optical fiber 7 in a tapering coupling mode and sealed in the second gas cavity 8. The second gas cavity 8 can realize the fixation of the coupling part of the output solid core optical fiber 7 and the anti-resonance hollow core optical fiber 6, and the connecting point 9 of the anti-resonance hollow core optical fiber and the output solid core optical fiber is positioned in the second gas cavity 8.
A first input fiber bragg grating 10 and a second input fiber bragg grating 11 are written on the input solid core fiber 2, and a first output fiber bragg grating 12 and a second output fiber bragg grating 13 are written on the output solid core fiber 7. The first input fiber bragg grating 10 and the second output fiber bragg grating 13 form a pair of fiber bragg gratings, the second input fiber bragg grating 11 and the first output fiber bragg grating 12 form a pair of fiber bragg gratings, and the two pairs of fiber bragg gratings form an oscillator structure. The first and second input fiber bragg gratings have a reflectivity of 98% or more for 4.66 μm and 2.33 μm lasers. The first output fiber Bragg grating has a reflectivity of 98% or more for 2.33 μm laser light. The second output fiber bragg grating has a transmission of 10% -90% for a 4.66 μm laser.
As shown in fig. 3, a tunable, narrow-linewidth 1.5 μm-band pump laser generated by a pump source 1 is input to a solid-core fiber 2, and the input solid-core fiber 2 is coupled to an antiresonant hollow-core fiber 6 by means of taper coupling and sealed in a first gas cavity 3. The vacuumizing and inflating system fills CO gas and buffer gas with proper air pressure into the anti-resonance hollow-core optical fiber 6 through the first gas cavity air inlet 4 on the side surface of the first gas cavity 3, and the buffer gas can enhance collision among gas molecules and increase the absorption line width of the CO gas molecules. The pump laser generates a first stage laser output of 2.33 μm by interaction with CO gas in the antiresonant hollow-core fiber 6. The output solid core optical fiber 7 is coupled with the output end of the anti-resonance hollow core optical fiber 6 in a tapering coupling mode, and is fixed and sealed by a second gas cavity 8. The 2.33 μm laser generated by the first stage is re-coupled into the anti-resonance hollow-core fiber 6 under the reflection of the first output fiber grating 12 and interacts with the CO gas in the anti-resonance hollow-core fiber 6 to generate a second stage stimulated radiation transition, and 4.66 μm laser is output. The laser is output from the input end of the anti-resonance hollow-core fiber 6, passes through the second input fiber Bragg grating 11, the residual 2.33 μm laser is reflected by the second input fiber Bragg grating 11 and continuously enters the anti-resonance hollow-core fiber 6 to react with CO gas, the 4.66 μm laser is reflected by the first input fiber Bragg grating 10, and the second output fiber Bragg grating 13 is output after being transmitted.
Referring to fig. 4, it is a schematic diagram of the detailed structure of the solid core fiber and the anti-resonance hollow core fiber tapering coupling. And tapering the solid-core optical fiber to obtain an untapered tapered area a, a tapered area b and a waist area c of the solid-core optical fiber. The waist region c and part of the cone region b of the solid core optical fiber extend into the fiber core region of the antiresonant hollow optical fiber, are adjusted to proper positions (the position corresponding to the maximum coupling efficiency by monitoring the power of the output end in real time is the proper position after final adjustment), and are sealed and fixed by using the corresponding gas cavity in fig. 3.
In summary, although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims (10)

1. The narrow-linewidth all-fiber cascade 4.66 mu m optical fiber gas laser with the oscillator structure is characterized in that: the optical fiber laser comprises a pumping source, an input solid optical fiber, a first gas cavity, an anti-resonance hollow optical fiber, a second gas cavity and an output solid optical fiber, wherein the pumping source is a tunable narrow-linewidth laser light source with a wave band of 1.5 mu m and is used for generating pumping laser; the output end of the pump source is connected with the input end of the input solid fiber, and a first input fiber Bragg grating and a second input fiber Bragg grating are engraved on the input solid fiber; two ends of the anti-resonance hollow-core optical fiber are respectively sealed in the first gas cavity and the second gas cavity in a vacuum manner; in the first gas cavity, the output end of the input solid core optical fiber is in coupling connection with the input end of the anti-resonance hollow core optical fiber after tapering; in the second gas cavity, the input end of the output solid optical fiber is in coupling connection with the output end of the anti-resonance hollow optical fiber after tapering, and the output end of the output solid optical fiber extends out of the second gas cavity; the first gas cavity or the second gas cavity is connected with a vacuumizing and inflating system, and the vacuumizing and inflating system is used for vacuumizing and inflating carbon monoxide gas and buffer gas with certain air pressure into the gas cavity and the fiber cores of the anti-resonance hollow-core optical fibers; a first output fiber Bragg grating and a second output fiber Bragg grating are engraved on the output solid core fiber; the first input fiber Bragg grating and the second output fiber Bragg grating form a pair of fiber Bragg gratings, the second input fiber Bragg grating and the first output fiber Bragg grating form a pair of fiber Bragg gratings, and the two pairs of fiber Bragg gratings form an oscillator structure.
2. The narrow linewidth all-fiber cascaded 4.66 μm fiber gas laser of an oscillator structure of claim 1, wherein: filling carbon monoxide gas and buffer gas with certain air pressure into the fiber core of the anti-resonance hollow-core optical fiber through a vacuum and inflation system, and increasing the absorption line width of CO gas molecules through collision broadening among gas molecules so as to cover the wavelength of the pump laser; the 1.5 mu m wave band pump laser interacts with the carbon monoxide gas filled in the fiber core of the antiresonant hollow fiber, and CO gas molecules generate 4.66 mu m laser output through two-stage cascade stimulated radiation transition under the oscillator structure.
3. The narrow linewidth all-fiber cascaded 4.66 μm fiber gas laser of an oscillator structure of claim 1, wherein: the buffer gas is helium, argon or methane.
4. The narrow linewidth all-fiber cascaded 4.66 μm fiber gas laser of an oscillator structure of claim 1, 2 or 3, wherein: the side surface of the first gas cavity or the second gas cavity is provided with a gas hole for connecting with a vacuum-pumping and gas-filling system.
5. The narrow linewidth all-fiber cascaded 4.66 μm fiber gas laser of an oscillator structure of claim 4, wherein: the vacuumizing and inflating system comprises a vacuum pump, a CO gas cylinder, a buffer gas cylinder, a gas pressure regulating valve and a barometer, and the corresponding gas cavity is vacuumized through the vacuum pump; the air pressure regulation and monitoring of the CO gas and the buffer gas in the anti-resonance hollow-core optical fiber are realized through the CO gas cylinder, the air pressure regulation valve and the air pressure gauge on the CO gas circuit, the buffer gas cylinder, the air pressure regulation valve and the air pressure gauge on the buffer gas circuit.
6. The narrow linewidth all-fiber cascaded 4.66 μm fiber gas laser of an oscillator structure of claim 4, wherein: the purity of the carbon monoxide gas is more than 99.99%.
7. The narrow linewidth all-fiber cascaded 4.66 μm fiber gas laser of an oscillator structure of claim 6, wherein: the pump source is a tunable narrow-line-width high-power pulse or continuous laser light source with the central wavelength of 1566nm, 1568nm, 1583nm or 1588 nm.
8. The narrow linewidth all-fiber cascaded 4.66 μm fiber gas laser of an oscillator structure of claim 1, wherein: the input solid optical fiber and the output solid optical fiber both adopt intermediate infrared soft glass optical fibers.
9. The narrow linewidth all-fiber cascaded 4.66 μm fiber gas laser of an oscillator structure of claim 1, wherein: the anti-resonance hollow-core optical fiber is an ice cream type anti-resonance hollow-core optical fiber or a node-free type anti-resonance hollow-core optical fiber.
10. The narrow linewidth all-fiber cascaded 4.66 μm fiber gas laser of an oscillator structure of claim 1, wherein: the first input fiber Bragg grating and the second input fiber Bragg grating have reflectivity of more than 98% for lasers with the wavelength of 4.66 mu m and 2.33 mu m; the first output fiber Bragg grating has a reflectivity of more than 98% for 2.33 mu m laser; the second output fiber bragg grating has a transmission of 10% -90% for a 4.66 μm laser.
CN202010470435.8A 2020-05-28 2020-05-28 Narrow-linewidth all-fiber cascade 4.66 mu m optical fiber gas laser with oscillator structure Active CN111864516B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113534346A (en) * 2021-06-25 2021-10-22 复旦大学 Optical fiber mode field adapter assembly and preparation method thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4685107A (en) * 1986-06-09 1987-08-04 Spectra-Physics, Inc. Dispersion compensated fiber Raman oscillator
CA2703218A1 (en) * 2007-10-31 2010-04-21 Robert J. Bambeck Gas analyzer systems and methods
CN103337779A (en) * 2013-07-05 2013-10-02 中国人民解放军国防科学技术大学 Optical-pumping intermediate infrared gas laser device
CN106253046A (en) * 2016-09-13 2016-12-21 中国人民解放军国防科学技术大学 All optical fibre structure mid-infrared gas cascade Ramar laser
CN106253047A (en) * 2016-09-13 2016-12-21 中国人民解放军国防科学技术大学 Tunable mid-infrared light fibre mixed gas cascade Ramar laser
CN107046220A (en) * 2017-01-09 2017-08-15 宁波大学 A kind of all-fiber high power mid and far infrared super continuum source

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4685107A (en) * 1986-06-09 1987-08-04 Spectra-Physics, Inc. Dispersion compensated fiber Raman oscillator
CA2703218A1 (en) * 2007-10-31 2010-04-21 Robert J. Bambeck Gas analyzer systems and methods
CN103337779A (en) * 2013-07-05 2013-10-02 中国人民解放军国防科学技术大学 Optical-pumping intermediate infrared gas laser device
CN106253046A (en) * 2016-09-13 2016-12-21 中国人民解放军国防科学技术大学 All optical fibre structure mid-infrared gas cascade Ramar laser
CN106253047A (en) * 2016-09-13 2016-12-21 中国人民解放军国防科学技术大学 Tunable mid-infrared light fibre mixed gas cascade Ramar laser
CN107046220A (en) * 2017-01-09 2017-08-15 宁波大学 A kind of all-fiber high power mid and far infrared super continuum source

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113534346A (en) * 2021-06-25 2021-10-22 复旦大学 Optical fiber mode field adapter assembly and preparation method thereof

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