CN212485787U - Near infrared fiber gas Raman laser oscillator - Google Patents
Near infrared fiber gas Raman laser oscillator Download PDFInfo
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- CN212485787U CN212485787U CN202021518801.4U CN202021518801U CN212485787U CN 212485787 U CN212485787 U CN 212485787U CN 202021518801 U CN202021518801 U CN 202021518801U CN 212485787 U CN212485787 U CN 212485787U
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Abstract
The utility model provides a gaseous Raman laser oscillator of near-infrared optic fibre, including the pumping source, the input grating, hollow optic fibre, output grating and pump light filter, the pumping source is used for producing the pump laser, the input grating has set gradually on the transmission light path of the pump laser of pumping source output, hollow optic fibre, output grating and pump light filter, wherein input grating and output grating constitute the resonant cavity, the pump laser couples to in the hollow optic fibre, it has Raman gain gas to fill in the fibre core of hollow optic fibre, the output coupling of hollow optic fibre is connected the output real core optic fibre that is provided with output grating and pump light filter, output real core optic fibre exports Raman laser at last. The utility model provides an application of all-fiber system of hollow optic fibre and solid core fiber connection problem, can also improve the stability, the portability of system, improve the practical application ability of system.
Description
Technical Field
The utility model belongs to the technical field of the laser instrument, a gaseous Raman laser oscillator of near-infrared optic fibre is related to.
Background
The lasers with the diameters of 1.5 mu m, 1.7 mu m, 2 mu m and the like have important application values in the fields of optical fiber communication, biomedical treatment, environmental monitoring and industrial processing. Tunable, narrow line width, high peak power 1.5 μm, 1.7 μm, 2 μm, etc. light sources provide ideal light sources for supercontinuum generation, realization of infrared gas laser, and generation of optical parametric oscillation. At present, light sources of 1.5 mu m, 1.7 mu m and 2 mu m are mainly obtained by a solid core glass fiber laser doped with rare earth ions, but the bottleneck problem of power improvement exists due to low damage threshold and strong nonlinear effect of the solid core doped fiber. Although laser outputs of 1.5 μm, 1.7 μm, 2 μm, and the like with high peak power can be obtained by technical means such as mode locking, Q-switching, and the like, the spectrum of the laser is broadened due to nonlinear effects caused by transmission of the laser with high peak power through a solid fiber, and it is difficult to realize narrow-linewidth output.
Therefore, the conventional rare earth ion doped solid glass fiber laser cannot simultaneously realize the output of narrow linewidth and high peak power.
SUMMERY OF THE UTILITY MODEL
To the technical problem that prior art exists, the utility model provides a near-infrared optic fibre gas Raman laser oscillator.
Stimulated raman scattering is inelastic collision, has no special requirement on the pump wavelength, and can generate laser radiation frequency shift by the stimulated raman scattering of gas molecules on laser, and the frequency shift amount depends on the energy level structure of the molecules. Because the gas stimulated Raman scattering has the characteristics of high gain coefficient, large frequency shift coefficient, flexible medium selection and the like, the method is an effective means for generating tunable and new-wavelength laser.
The hollow fiber core can be filled with a gas medium to restrict laser transmission, so that an almost ideal environment is provided for stimulated Raman scattering of gas, and the interaction distance and the interaction strength of the gas and the laser can be greatly increased. Meanwhile, the transmission band of the hollow-core optical fiber can be reasonably designed, the loss of each Raman signal can be effectively controlled, the generation of unnecessary Raman spectral lines is inhibited, and the conversion efficiency of target wavelength Raman laser is improved. Therefore, the optical fiber gas Raman laser based on the stimulated Raman scattering of the gas in the hollow optical fiber is an effective means for realizing high-efficiency and tunable laser output with new wavelength. On the basis, the application of the all-fiber system for solving the connection problem of the hollow-core fiber and the solid-core fiber can also improve the stability and the portability of the system and improve the practical application capability of the system.
Specifically, the utility model discloses a technical scheme do:
the near-infrared optical fiber gas Raman laser oscillator comprises a pumping source, an input end grating, a hollow optical fiber, an output end grating and a pumping light filtering device, wherein the pumping source is used for generating pumping laser, the transmission light path of the pumping laser output by the pumping source is sequentially provided with the input end grating, the hollow optical fiber, the output end grating and the pumping light filtering device, the input end grating and the output end grating form a resonant cavity, the pumping laser is coupled into the hollow optical fiber, Raman gain gas is filled in the fiber core of the hollow optical fiber, the output end of the hollow optical fiber is coupled and connected with the output end solid optical fiber provided with the output end grating and the pumping light filtering device, and the output end solid optical fiber finally outputs the.
As the preferred scheme of the utility model, the pumping source is the continuous fiber laser or the fiber amplifier of 1 μm wave band, raman gain gas is methane, can pass through the stimulated raman scattering effect with 1 μm wave band pumping laser and shift to 1.5 μm wave band. The hollow-core optical fiber adopts an anti-resonance hollow-core optical fiber, such as a node-free type or a conjoined type anti-resonance hollow-core optical fiber. The hollow-core optical fiber has very low transmission loss for pump laser in a 1 mu m waveband and Raman laser in a 1.5 mu m waveband, and has higher transmission loss for laser in other wavebands. The near-infrared fiber gas Raman laser oscillator finally outputs Raman laser with a wave band of 1.5 mu m. Methane (CH)4) The gas mainly generates a frequency shift coefficient of 2917cm in the stimulated Raman scattering of free space-1The vibrational raman lines of (a). Thus using a 1 μm band pump source, using CH4The vibration stimulated Raman scattering of the gas can realize the output of laser with a wave band of 1.5 mu m.
As the preferable scheme of the utility model, the pumping source is a continuous fiber laser or a fiber amplifier with a wave band of 1.55 μm, and the Raman gain gas is H2Or D2Gas capable of frequency shifting 1.55 μm pump laser to 1.7 μm band by stimulated raman scattering effect. The hollow-core optical fiber adopts a hollow-core photonic crystal fiber. The hollow-core optical fiber has very low transmission loss for pump laser in a 1.55 mu m waveband and Raman laser in a 1.7 mu m waveband, and has higher transmission loss for laser in other wavebands. The near-infrared fiber gas Raman laser oscillator finally outputs Raman laser with a wave band of 1.7 mu m. H2And D2Gas is a commonly used gas Raman gain medium, and generally generates a plurality of Raman spectral lines in free space stimulated Raman scattering, mainly divided into vibration Raman spectral linesAnd rotating the raman lines corresponding to changes in the vibrational and rotational energy levels of the gas molecules. Among these lines, for H2The Raman frequency shift coefficient of the rotation spectral line with the maximum molecular gain coefficient is about 587cm-1For D2The Raman frequency shift coefficient of the rotating spectral line with the maximum molecular gain coefficient is about 415cm-1. Thus using pumping in the 1.55 μm band, using H2And D2The rotation stimulated Raman scattering of the gas can realize the output of laser with a wave band of 1.7 mu m.
As the preferable proposal of the utility model, the pumping source is a 1.9 μm wave band continuous fiber laser or a fiber amplifier, and the Raman gain gas is D2And the gas can shift the pump laser with the wave band of 1.9 mu m to the wave band of 2 mu m through the stimulated Raman scattering effect. The hollow-core optical fiber adopts a hollow-core photonic crystal fiber. The hollow-core optical fiber has very low transmission loss for pump laser in a 1.9 mu m waveband and Raman laser in a 2 mu m waveband, and has higher transmission loss for laser in other wavebands. The near-infrared fiber gas Raman laser oscillator finally outputs Raman laser with a wave band of 2 μm. In the stimulated raman scattering of gas in free space, a plurality of raman spectral lines are generally generated, and the raman spectral lines are mainly divided into vibration raman spectral lines and rotation raman spectral lines, and correspond to the changes of the vibration energy level and the rotation energy level of gas molecules. Deuterium gas (D)2) The gas is one of the commonly used gas Raman gain media, and has a Raman frequency shift coefficient of about 415cm-1And 297cm-1The rotational spectral line of (c). Thus using pumping in the 1.9 μm band, using D2The rotation stimulated Raman scattering of the gas can realize the output of laser with a wave band of 2 mu m.
As the utility model discloses a preferred scheme, pump light filter equipment comprises center wavelength for the chirp slope fiber grating and the cladding light filter of pumping wavelength, and center wavelength is the transmission behind the chirp slope fiber grating of pumping wavelength will be to the remaining pump laser coupling of forward transmission to the cladding, and cladding light filter is used for the filtering to couple to the remaining pump laser of cladding.
As the utility model discloses a preferred scheme, input end grating and output end grating are the fiber bragg grating, and wherein input end fiber bragg grating is the high reflectivity broad spectrum grating of raman laser wavelength for central wavelength, and output end fiber bragg grating is the low reflectivity broad spectrum grating of raman laser wavelength for central wavelength, and both are carved on real core single mode fiber. The hollow optical fiber is connected with the solid single-mode optical fiber with the written input end grating and the solid single-mode optical fiber with the written output end grating in a fusion mode respectively so as to realize the sealing of the gas in the hollow optical fiber.
As the utility model discloses an optimized scheme, the utility model discloses still include raman optical filter, raman optical filter sets up between pumping source and input grating, and raman optical filter includes that central wavelength is the chirp slope fiber grating and the covering light filter ware of raman wavelength, and central wavelength is the chirp slope fiber grating of raman wavelength with the raman laser coupling of trace backward transmission to the preceding transmission of covering, and the covering light filter ware is used for the raman laser of filtering coupling to covering transmission.
As an optimized scheme of the utility model, the utility model discloses still include narrow linewidth control device. The narrow linewidth control device is arranged inside the resonant cavity. The narrow linewidth control device is a pi phase shift fiber grating with the central wavelength of Raman wavelength, which is engraved on the input end grating, and performs narrow linewidth filtering on Raman laser in the oscillation starting process of the Raman laser so as to play a role in controlling linewidth.
The pumping source of the utility model is used for generating pumping laser; the Raman optical filtering device is used for filtering trace backward-transmitted Raman laser; the hollow-core optical fiber is used for constraining the pumping laser and the filling gas and providing an environment for long-range interaction of the pumping laser and the Raman gain gas; the resonant cavity is used for providing signal feedback, reducing the light-emitting threshold of the laser and inhibiting the generation of Raman laser with other wavelengths; the working gas is filled in the hollow optical fiber and is used for generating Raman laser; the pumping light filtering device is used for filtering residual pumping light, so that the whole laser device only outputs Raman laser.
Compared with the prior art, the utility model has the advantages of:
(1) the utility model provides a gaseous laser generator of optic fibre for producing raman laser.
(2) The utility model adopts the all-fiber structure, and has the advantages of compact structure and convenient carrying.
(3) The utility model discloses a resonant cavity structure plays the effect that reduces stimulated raman scattering threshold value, realizes the continuous laser output under the low pumping power.
(4) The method of combining the chirped inclined fiber grating with the cladding light filter is used for filtering the residual pump laser and the backward transmission Raman laser, and has the advantages of simple structure and convenience in operation.
(5) And realizing narrow linewidth output of Raman laser by using the pi phase shift fiber bragg grating.
(6) The utility model discloses it is high to combine gas laser output, and the damage threshold value is high and the advantage that fiber laser light beam quality is good, has very big potential advantage in practical application.
Drawings
FIG. 1 is a cross-sectional electron microscope image of a node-free type antiresonant hollow-core fiber.
FIG. 2 is a cross-sectional electron microscope image of a conjoined antiresonant hollow-core fiber.
FIG. 3 is a schematic cross-sectional view of a hollow core photonic crystal fiber.
FIG. 4 is a schematic representation of the loss spectrum of a hollow core fiber.
FIG. 5 is a diagram of the transmission spectrum of a chirped tilted fiber grating.
Fig. 6 is a schematic structural diagram of a first near-infrared fiber gas raman laser oscillator.
Fig. 7 is a schematic structural diagram of a second near-infrared fiber gas raman laser oscillator.
Fig. 8 is a schematic structural diagram of a third near-infrared fiber gas raman laser oscillator.
Illustration of the drawings:
1. a pump source; 2. 1# chirped tilted fiber grating; 3. 1# cladding light filter; 4. inputting a fiber Bragg grating; 5. inputting end welding points; 6. a hollow-core optical fiber; 7. welding points at the output end; 8. outputting a fiber Bragg grating; 9. 2# cladding light filter; 10. 2# chirped tilted fiber grating; 11. and pi phase shift fiber grating.
Detailed Description
The invention is further described with reference to the drawings and the specific embodiments.
FIG. 1 is a cross-sectional electron microscope image of a node-free type antiresonant hollow-core fiber. FIG. 2 is a cross-sectional electron microscope image of a conjoined antiresonant hollow-core fiber. FIG. 3 is a schematic cross-sectional view of a hollow core photonic crystal fiber. Fig. 3 is a schematic diagram of the loss spectrum of such a hollow-core optical fiber. The transmission band range of the hollow-core photonic crystal fiber is generally narrow, and for hydrogen or deuterium stimulated Raman scattering, the hollow-core photonic crystal fiber only comprises a pumping wavelength and a first-order rotating Raman wavelength, and the vibration Raman laser and the high-order rotating Raman laser are generally positioned outside the transmission band, so that the generation of the first-order rotating Raman laser in a 1.7 or 2 mu m wave band is facilitated. The node-free hollow fiber and the conjoined hollow fiber have relatively wide transmission band range, can cover pumping wavelength and first-order vibration Raman wavelength for methane stimulated Raman scattering, and the high-order vibration Raman wavelength is positioned outside the transmission band range, so that the generation of first-order vibration Raman laser is facilitated.
Fig. 5 shows a schematic diagram of the transmission spectrum of the 1# chirped tilted fiber grating in the raman light-filtering device. The transmission spectrum shows that the Raman laser transmittance is extremely low, so that the 1# chirped and inclined fiber grating cannot pass through; the transmission rate of the pump laser is nearly 100%, so that the 1# chirped inclined fiber grating has no influence on the transmission of the pump laser. And according to the principle of the chirped tilted fiber grating, the non-transparent Raman laser is coupled into the cladding and is transmitted reversely, and the Raman laser can be filtered by using the 1# cladding optical filter. Therefore, the 1# chirped tilted fiber grating combined with the 1# cladding light filter will have the filtering effect. When the center wavelength of the chirped and inclined fiber grating is set as the pumping wavelength, the combination of the chirped and inclined fiber grating and the cladding light filter is arranged at the output end solid core fiber, so that the filtering of the residual pumping laser can be realized.
Example 1:
fig. 6 is a schematic structural diagram of a first near-infrared fiber gas raman laser oscillator, which is adopted in the present embodiment,the 1.5 mu m band near infrared fiber gas Raman laser oscillator comprises a pump source 1, a 1# chirped and inclined fiber grating 2, a 1# cladding light filter 3, an input fiber Bragg grating 4, an input end fusion point 5, a hollow fiber 6, an output end fusion point 7, an output fiber Bragg grating 8, a 2# cladding light filter 9 and a 2# chirped and inclined fiber grating 10. In this embodiment, the pump source is a continuous fiber laser or a fiber amplifier with a wavelength of 1 μm, and the raman gain gas is methane, which can frequency-shift the pump laser with a wavelength of 1 μm to a wavelength of 1.5 μm by a stimulated raman scattering effect. The hollow-core optical fiber 6 adopts an anti-resonance hollow-core optical fiber, and the hollow-core optical fiber 6 has very low transmission loss for pump laser of a 1 mu m waveband and Raman laser of a 1.5 mu m waveband, and has higher transmission loss for laser of other wavebands. The near-infrared fiber gas Raman laser oscillator finally outputs Raman laser with a wave band of 1.5 mu m. Methane (CH)4) The gas mainly generates a frequency shift coefficient of 2917cm in the stimulated Raman scattering of free space-1The vibrational raman lines of (a). Thus using a 1 μm band pump source, using CH4The vibration stimulated Raman scattering of the gas can realize the output of laser with a wave band of 1.5 mu m.
A1-micron continuous fiber laser or an amplifier is used as a pumping source 1, and 1-micron waveband continuous pumping laser generated by the pumping source 1 is coupled into a hollow-core fiber 6 through a 1# chirped inclined fiber grating 2, a 1# cladding optical filter 3, an input fiber Bragg grating 4 and an input end fusion point 5 between the solid-core fiber and the hollow-core fiber, which are arranged on the input end solid-core fiber. The fiber core of the hollow-core optical fiber 6 is filled with working gas and simultaneously restrains pumping laser transmission, so that an ideal environment is provided for the interaction of the working gas and the pumping laser. The working gas filled in the hollow optical fiber 6 is CH4A gas. The pump laser is filled in the core of the hollow-core optical fiber 6 and CH filled therein4The gas generates stimulated Raman scattering effect to generate continuous signal light with 1.5 mu m wave band. The residual pump laser passes through an output end fusion point 7 between the output end solid core optical fiber and the hollow core optical fiber, an output optical fiber Bragg grating 8 and a 2# cladding optical filter 9, is coupled to a cladding by a 2# chirped inclined optical fiber grating 10 and then is transmitted, and the residual pump laser transmitted backwards in the cladding passes through the 2# claddingThe layer light filter 9 is filtered out. Continuous signal light with a wave band of 1.5 mu m generated in the fiber core of the hollow-core optical fiber 6 is reflected for multiple times in a resonant cavity formed by the input fiber Bragg grating 4 and the output fiber Bragg grating 8 to form resonance. The micro 1.5 mu m wave band laser is transmitted backwards through the input fiber Bragg grating 4, coupled to the cladding through the 1# chirped inclined fiber grating 2, converted into forward transmission, and then filtered by the 1# cladding optical filter 3. And a part of the laser with the wave band of 1.5 mu m resonated in the resonant cavity is transmitted and output from the output fiber Bragg grating 8 and then output through the 2# cladding optical filter 9 and the 2# chirped inclined fiber grating 10.
This embodiment takes 1064nm pump laser as an example, because of CH4The main vibration rotation Raman frequency shift coefficient is about 2917cm-1Using CH4As the working gas, the Raman laser output of 1543nm can be realized.
The input end solid core optical fiber is sequentially provided with a 1# chirped inclined optical fiber grating 2, a 1# cladding optical filter 3 and an input optical fiber Bragg grating 4, wherein the 1# chirped inclined optical fiber grating 2 is a chirped inclined optical fiber grating with the center wavelength being the Raman wavelength, 1.5 mu m Raman laser transmitted in a trace backward direction is coupled to the cladding for forward transmission, and the 1# cladding optical filter 3 is used for filtering the 1.5 mu m Raman laser coupled to the cladding for transmission. The input fiber bragg grating 4 is a high-reflectivity wide-spectrum grating having a central wavelength of raman laser wavelength. An output fiber Bragg grating 8, a 2# cladding light filter 9 and a 2# chirped inclined fiber grating 10 are sequentially arranged on the output end solid core fiber; the output fiber bragg grating 8 is a low-reflectivity wide-spectrum grating with the center wavelength of raman laser wavelength. The input fiber bragg grating 4 and the output fiber bragg grating 8 constitute a resonant cavity, so that the 1.5 μm-band raman laser forms resonance to reduce the threshold for generating the raman laser. The 2# chirped and inclined fiber grating 10 with the central wavelength being the pumping wavelength couples the residual pumping laser light transmitted in the forward direction to the cladding layer for backward transmission, and the 2# cladding layer optical filter 9 is used for filtering the residual pumping laser light coupled to the cladding layer.
The 1.5 μm and 1.5 μm wavelength bands herein mean that both laser light in the vicinity of the wavelength point can be output. By setting the working wavelength of the continuous optical fiber laser pumping source with the 1 mu m waveband and the central wavelength of the input optical fiber Bragg grating and the output optical fiber Bragg grating, the laser output with the specific wavelength within the 1.5 mu m waveband range can be realized.
Example 2:
fig. 7 is a schematic structural diagram of a second near-infrared fiber gas raman laser oscillator, and this embodiment provides a near-infrared fiber gas raman laser oscillator with a wavelength band of 1.5 μm under low power operation, which includes a pump source 1, an input fiber bragg grating 4, an input end fusion point 5, a hollow fiber 6, an output end fusion point 7, an output fiber bragg grating 8, a # 2 cladding optical filter 9, and a # 2 chirped tilted fiber grating 10. In this embodiment, the pump source is a continuous fiber laser or a fiber amplifier with a wavelength of 1 μm, and the raman gain gas is methane, which can frequency-shift the pump laser with a wavelength of 1 μm to a wavelength of 1.5 μm by a stimulated raman scattering effect. The hollow-core optical fiber 6 adopts an anti-resonance hollow-core optical fiber, and the hollow-core optical fiber 6 has very low transmission loss for pump laser of a 1 mu m waveband and Raman laser of a 1.5 mu m waveband, and has higher transmission loss for laser of other wavebands. The near-infrared fiber gas Raman laser oscillator finally outputs Raman laser with a wave band of 1.5 mu m.
The continuous pumping laser with the wave band of 1 mu m generated by the continuous optical fiber laser pumping source 1 with the wave band of 1 mu m is coupled into the fiber core of the hollow-core optical fiber 6 after being input into the optical fiber Bragg grating 4 and the input end fusion point 5 between the solid-core optical fiber and the hollow-core optical fiber at the input end. The pump laser is filled in the core of the hollow-core optical fiber 6 and CH filled therein4The gas generates stimulated Raman scattering effect to generate continuous signal light with 1.5 mu m wave band. The residual pump laser passes through an output end fusion point 7 between the output end solid core optical fiber and the hollow core optical fiber, an output optical fiber Bragg grating 8 and a 2# cladding optical filter 9, is coupled to the cladding by a 2# chirped inclined optical fiber grating 10 and then is transmitted, and the residual pump laser transmitted backwards in the cladding is filtered by the 2# cladding optical filter 9. Continuous signal light with a wave band of 1.5 mu m generated in the fiber core of the hollow-core optical fiber 6 is reflected for multiple times in a resonant cavity formed by the input fiber Bragg grating 4 and the output fiber Bragg grating 8 to form resonance. Part of laser with wave band of 1.5 μm in the resonant cavity is transmitted from output optical fiber Bragg grating 8The outgoing light is passed through a 2# cladding light filter 9 and a 2# chirped tilted fiber grating 10.
Example 3:
fig. 8 is a schematic structural diagram of a third near-infrared fiber gas raman laser oscillator, which is adopted in this embodiment to provide a narrow-linewidth 1.5 μm-band near-infrared fiber gas raman laser oscillator, including a pump source 1, a 1# chirped tilted fiber grating 2, a 1# cladding light filter 3, an input fiber bragg grating 4, an input end fusion point 5, a hollow fiber 6, an output end fusion point 7, an output fiber bragg grating 8, a 2# cladding light filter 9, a 2# chirped tilted fiber grating 10, and a pi-phase shift fiber grating 11. In this embodiment, the pump source is a continuous fiber laser or a fiber amplifier with a wavelength of 1 μm, and the raman gain gas is methane, which can frequency-shift the pump laser with a wavelength of 1 μm to a wavelength of 1.5 μm by a stimulated raman scattering effect. The hollow-core optical fiber 6 adopts an anti-resonance hollow-core optical fiber, and the hollow-core optical fiber 6 has very low transmission loss for pump laser of a 1 mu m waveband and Raman laser of a 1.5 mu m waveband, and has higher transmission loss for laser of other wavebands. The near-infrared fiber gas Raman laser oscillator finally outputs Raman laser with a wave band of 1.5 mu m.
A1-micron continuous fiber laser or an amplifier is used as a pumping source 1, and 1-micron waveband continuous pumping laser generated by the pumping source 1 is coupled into a fiber core of a hollow-core fiber 6 through a 1# chirped inclined fiber grating 2, a 1# cladding light filter 3, an input fiber Bragg grating 4, a pi-phase shift fiber grating 11 and an input end fusion point 5 between the solid-core fiber and the hollow-core fiber, which are arranged on the input end solid-core fiber. The fiber core of the hollow-core optical fiber 6 is filled with working gas and simultaneously restrains pumping laser transmission, so that an ideal environment is provided for the interaction of the working gas and the pumping laser. The working gas filled in the hollow optical fiber 6 is CH4A gas. The pump laser is filled in the core of the hollow-core optical fiber 6 and CH filled therein4The gas generates stimulated Raman scattering effect to generate continuous signal light with 1.5 mu m wave band. The residual pump laser passes through an output end fusion point 7 between the output end solid core optical fiber and the hollow optical fiber, an output optical fiber Bragg grating 8, a 2# cladding optical filter 9, and the 2# chirped inclined optical fiber grating10 are coupled to the cladding for backward transmission, and the residual pump laser light transmitted backward in the cladding is filtered out by a # 2 cladding light filter 9. Continuous signal light with a wave band of 1.5 mu m generated in the fiber core of the hollow-core optical fiber 6 is reflected for multiple times in a resonant cavity formed by the input fiber Bragg grating 4 and the output fiber Bragg grating 8 to form resonance. In the resonance process, 1.5 μm waveband signal light is continuously filtered by the pi phase shift fiber grating 11, so that the characteristic of narrow linewidth is always kept. The micro 1.5 mu m wave band laser is transmitted backwards through the input fiber Bragg grating 4, coupled to the cladding through the 1# chirped inclined fiber grating 2, converted into forward transmission, and then filtered by the 1# cladding optical filter 3. And a part of the laser with the wave band of 1.5 mu m resonated in the resonant cavity is transmitted and output from the output fiber Bragg grating 8 and then output through the 2# cladding optical filter 9 and the 2# chirped inclined fiber grating 10.
Example 4:
fig. 6 is a schematic structural diagram of a first near-infrared fiber gas raman laser oscillator, and this embodiment provides a 1.7 μm band near-infrared fiber gas raman laser oscillator including a pump source 1, a 1# chirped tilted fiber grating 2, a 1# cladding light filter 3, an input fiber bragg grating 4, an input end fusion point 5, a hollow fiber 6, an output end fusion point 7, an output fiber bragg grating 8, a 2# cladding light filter 9, and a 2# chirped tilted fiber grating 10. The pumping source is a continuous fiber laser or a fiber amplifier with a wave band of 1.55 mu m, and the Raman gain gas is H2Or D2Gas capable of frequency shifting 1.55 μm pump laser to 1.7 μm band by stimulated raman scattering effect. The hollow-core optical fiber 6 adopts a hollow-core photonic crystal optical fiber, and the hollow-core optical fiber 6 has very low transmission loss for pump laser with a wave band of 1.55 mu m and Raman laser with a wave band of 1.7 mu m, and has higher transmission loss for laser with other wave bands. The near-infrared fiber gas Raman laser oscillator finally outputs Raman laser with a wave band of 1.7 mu m. H2And D2Gas is a commonly used gas Raman gain medium, generally generates a plurality of Raman spectral lines in free space stimulated Raman scattering, is mainly divided into vibration Raman spectral lines and rotation Raman spectral lines and corresponds to changes of gas molecule vibration energy levels and rotation energy levelsAnd (4) transforming. Among these lines, for H2The Raman frequency shift coefficient of the rotation spectral line with the maximum molecular gain coefficient is about 587cm-1For D2The Raman frequency shift coefficient of the rotating spectral line with the maximum molecular gain coefficient is about 415cm-1. Thus using pumping in the 1.55 μm band, using H2And D2The rotation stimulated Raman scattering of the gas can realize the output of laser with a wave band of 1.7 mu m. Take 1550nm pump laser as an example, because of H2Has a main rotational Raman frequency shift coefficient of about 587cm-1Using H2As working gas, 1705nm Raman laser output can be realized; due to D2Has a main rotational Raman frequency shift coefficient of about 415cm-1Using D2As the working gas, 1657nm Raman laser output can be realized.
The 1.7 μm and 1.7 μm wavelength bands herein mean that both laser light in the vicinity of the wavelength point can be output. By setting the working wavelength of the continuous optical fiber laser pumping source with the 1.55 mu m wave band, the central wavelength of the input optical fiber Bragg grating and the output optical fiber Bragg grating and selecting the type of working gas, the laser output with the specific wavelength within the 1.7 mu m wave band range can be realized.
The raman laser transmittance in the 1.7 μm band at the 1# chirped tilted fiber grating 2 is extremely low, and thus cannot pass through the 1# chirped tilted fiber grating 2; the transmission rate of the pump laser in the 1.55 mu m wave band is nearly 100 percent, so that the 1# chirped inclined fiber grating 2 has no influence on the transmission of the pump laser. And according to the principle of the chirped inclined fiber grating, the laser of the 1.7 μm wave band which cannot be transmitted is coupled into the cladding for reverse transmission, and the laser of the 1.7 μm wave band can be filtered by using the 1# cladding optical filter. Therefore, the 1# chirped tilted fiber grating combined with the 1# cladding light filter will have the filtering effect. When the center wavelength of the 2# chirped tilted fiber grating is set to the pump wavelength of the 1.55 μm waveband, the combination of the 2# chirped tilted fiber grating and the 2# cladding light filter can realize the filtering of the residual pump laser.
Example 5:
FIG. 7 is a schematic structural diagram of a second near-infrared fiber gas Raman laser oscillator, which is adopted in the present embodiment to provideA1.7-micron near-infrared fiber gas Raman laser oscillator under low-power operation comprises a pump source 1, an input fiber Bragg grating 4, an input end fusion point 5, a hollow fiber 6, an output end fusion point 7, an output fiber Bragg grating 8, a 2# cladding light filter 9 and a 2# chirp inclined fiber grating 10. The pumping source is a continuous fiber laser or a fiber amplifier with a wave band of 1.55 mu m, and the Raman gain gas is H2Or D2Gas capable of frequency shifting 1.55 μm pump laser to 1.7 μm band by stimulated raman scattering effect. The hollow-core optical fiber 6 adopts a hollow-core photonic crystal optical fiber, and the hollow-core optical fiber 6 has very low transmission loss for pump laser with a wave band of 1.55 mu m and Raman laser with a wave band of 1.7 mu m, and has higher transmission loss for laser with other wave bands.
The continuous pumping laser with the wave band of 1.55 microns generated by the continuous optical fiber laser pumping source 1 with the wave band of 1.55 microns is coupled into the fiber core of the hollow-core optical fiber 6 after being input into the optical fiber Bragg grating 4 and the input end fusion point 5 between the solid-core optical fiber and the hollow-core optical fiber at the input end. The pumping laser is filled in the core of the hollow-core optical fiber 6 and H filled therein2Or D2The stimulated Raman scattering effect is generated, and continuous signal light with the wave band of 1.7 mu m is generated. The residual pump laser passes through an output end fusion point 7 between the output end solid core optical fiber and the hollow core optical fiber, an output optical fiber Bragg grating 8 and a 2# cladding optical filter 9, is coupled to the cladding by a 2# chirped inclined optical fiber grating 10 and then is transmitted, and the residual pump laser transmitted backwards in the cladding is filtered by the 2# cladding optical filter 9. Continuous signal light with a wave band of 1.7 mu m generated in the fiber core of the hollow-core optical fiber 6 is reflected for multiple times in a resonant cavity formed by the input fiber Bragg grating 4 and the output fiber Bragg grating 8 to form resonance. A part of the laser light with the wave band of 1.7 μm in the resonant cavity is transmitted and output from the output fiber Bragg grating 8, and then is output through the 2# cladding light filter 9 and the 2# chirped inclined fiber grating 10.
Example 6:
FIG. 8 is a schematic structural diagram of a third near-infrared fiber gas Raman laser oscillator, which is adopted in this embodiment to provide a narrow-linewidth near-infrared fiber gas Raman laser oscillator with a 1.7 μm band, and includes pump sources 1 and 1The optical fiber grating comprises a # chirped inclined optical fiber grating 2, a # 1 cladding optical filter 3, an input optical fiber Bragg grating 4, an input end fusion point 5, a hollow optical fiber 6, an output end fusion point 7, an output optical fiber Bragg grating 8, a # 2 cladding optical filter 9, a # 2 chirped inclined optical fiber grating 10 and a pi-phase shift optical fiber grating 11. The pumping source is a continuous fiber laser or a fiber amplifier with a wave band of 1.55 mu m, and the Raman gain gas is H2Or D2Gas capable of frequency shifting 1.55 μm pump laser to 1.7 μm band by stimulated raman scattering effect. The hollow-core optical fiber 6 adopts a hollow-core photonic crystal optical fiber, and the hollow-core optical fiber 6 has very low transmission loss for pump laser with a wave band of 1.55 mu m and Raman laser with a wave band of 1.7 mu m, and has higher transmission loss for laser with other wave bands.
A1.55-micron continuous fiber laser or an amplifier is used as a pumping source 1, and 1.55-micron waveband continuous pumping laser generated by the pumping source 1 is coupled into a fiber core of a hollow-core fiber 6 through a 1# chirped inclined fiber grating 2, a 1# cladding light filter 3, an input fiber Bragg grating 4, a pi-phase shift fiber grating 11 and an input end fusion point 5 between the solid-core fiber and the hollow-core fiber, which are arranged on the input end solid-core fiber. The fiber core of the hollow-core optical fiber 6 is filled with working gas and simultaneously restrains pumping laser transmission, so that an ideal environment is provided for the interaction of the working gas and the pumping laser. The working gas filled inside the hollow optical fiber 6 is H2Or D2A gas. The pumping laser is filled in the core of the hollow-core optical fiber 6 and H filled therein2Or D2The gas generates stimulated Raman scattering effect to generate continuous signal light with 1.7 mu m wave band. The residual pump laser passes through an output end fusion point 7 between the output end solid core optical fiber and the hollow core optical fiber, an output optical fiber Bragg grating 8 and a 2# cladding optical filter 9, a 2# chirped inclined optical fiber grating 10 is coupled to the cladding and then transmitted, and the residual pump laser transmitted backwards in the cladding is filtered through the 2# cladding optical filter 9. Continuous signal light with a wave band of 1.7 mu m generated in the fiber core of the hollow-core optical fiber 6 is reflected for multiple times in a resonant cavity formed by the input fiber Bragg grating 4 and the output fiber Bragg grating 8 to form resonance. In the resonance process, 1.7 μm wave band signal light is continuously filtered by the pi phase shift fiber grating 11, thereby always keeping narrow line widthAnd (4) characteristics. The micro 1.7 mu m wave band laser is transmitted backwards through the input fiber Bragg grating 4, coupled to the cladding through the 1# chirped inclined fiber grating 2, converted into forward transmission, and then filtered by the 1# cladding optical filter 3. And a part of the laser with the wave band of 1.7 microns resonated in the resonant cavity is transmitted and output from the output fiber Bragg grating 8 and then output through the 2# cladding optical filter 9 and the 2# chirped inclined fiber grating 10.
Example 7:
fig. 6 is a schematic structural diagram of a first near-infrared fiber gas raman laser oscillator, and this embodiment provides a 2 μm-band near-infrared fiber gas raman laser oscillator including a pump source 1, a 1# chirped tilted fiber grating 2, a 1# cladding filter 3, an input fiber bragg grating 4, an input end fusion point 5, a hollow fiber 6, an output end fusion point 7, an output fiber bragg grating 8, a 2# cladding filter 9, and a 2# chirped tilted fiber grating 10. The pumping source 1 is a 1.9 mu m wave band continuous fiber laser or a fiber amplifier, and the Raman gain gas is D2And the gas can shift the pump laser with the wave band of 1.9 mu m to the wave band of 2 mu m through the stimulated Raman scattering effect. The hollow-core optical fiber 6 adopts a hollow-core photonic crystal optical fiber, and the hollow-core optical fiber 6 has very low transmission loss for pump laser with a 1.9 mu m waveband and Raman laser with a 2 mu m waveband, and has higher transmission loss for laser with other wavebands. The near-infrared fiber gas Raman laser oscillator finally outputs Raman laser with a wave band of 2 μm. Take 1950nm pump laser as an example, since D2There is a frequency shift coefficient of about 297cm-1By rotating Raman lines of D2As working gas, 2070nm Raman laser output can be realized; d2There is also a frequency shift coefficient of about 415cm-1If the wavelength of the pump laser is 1980nm, the output of the Raman laser with 2157nm can be realized. The 2 μm band herein means that laser light in the vicinity of the wavelength point can be output. By setting the working wavelength of the continuous optical fiber laser pumping source with the 1.9 mu m wave band and the central wavelength of the input optical fiber Bragg grating and the output optical fiber Bragg grating, the laser output with the specific wavelength within the 2 mu m wave band range can be realized.
At 1.9 muAn m continuous optical fiber laser or an amplifier is used as a pumping source 1, and 1.9 mu m waveband continuous pumping laser generated by the pumping source 1 is coupled into a hollow-core optical fiber 6 through a 1# chirped inclined optical fiber grating 2, a 1# cladding optical filter 3, an input optical fiber Bragg grating 4 and an input end fusion point 5 between the solid-core optical fiber and the hollow-core optical fiber which are arranged on the input end solid-core optical fiber. The fiber core of the hollow-core optical fiber 6 is filled with working gas and simultaneously restrains pumping laser transmission, so that an ideal environment is provided for the interaction of the working gas and the pumping laser. The working gas filled inside the hollow optical fiber 6 is D2A gas. Pump laser filled in the core of hollow-core optical fiber 62The gas generates stimulated Raman scattering effect to generate 2 μm wave band continuous signal light. The residual pump laser passes through an output end fusion point 7 between the output end solid core optical fiber and the hollow core optical fiber, an output optical fiber Bragg grating 8 and a 2# cladding optical filter 9, a 2# chirped inclined optical fiber grating 10 is coupled to the cladding and then transmitted, and the residual pump laser transmitted backwards in the cladding is filtered through the 2# cladding optical filter 9. Continuous signal light with a wave band of 2 mu m generated in the fiber core of the hollow-core optical fiber 6 is reflected for multiple times in a resonant cavity formed by the input fiber Bragg light 4 and the output fiber Bragg grating 8 to form resonance. The micro 2 μm waveband laser is transmitted backwards through the input fiber Bragg grating 4, coupled to the cladding through the 1# chirped and inclined fiber Bragg grating 2, converted into forward transmission, and then filtered through the 1# cladding optical filter 3. And a part of the 2 mu m wave band laser resonated in the resonant cavity is transmitted and output from the output fiber Bragg grating 8 and then output through the 2# cladding optical filter 9 and the 2# chirped inclined fiber grating 10.
Example 8:
fig. 7 is a schematic structural diagram of a second near-infrared fiber gas raman laser oscillator, and this embodiment provides a 2 μm near-infrared fiber gas raman laser oscillator under low power operation, which includes a pump source 1, an input fiber bragg grating 4, an input end fusion point 5, a hollow fiber 6, an output end fusion point 7, an output fiber bragg grating 8, a # 2 cladding light filter 9, and a # 2 chirped tilted fiber grating 10.
The pumping source is a continuous fiber laser or a fiber amplifier with a wave band of 1.9 mu mThe Raman gain gas is D2Gas capable of frequency shifting the 1.9 μm pump laser to the 2 μm band by the stimulated raman scattering effect. The hollow-core optical fiber 6 adopts a hollow-core photonic crystal optical fiber, and the hollow-core optical fiber 6 has very low transmission loss for pump laser with a 1.9 mu m waveband and Raman laser with a 2 mu m waveband, and has higher transmission loss for laser with other wavebands. Take 1950nm pump laser as an example, since D2There is a frequency shift coefficient of about 297cm-1By rotating Raman lines of D2As working gas, 2070nm Raman laser output can be realized; d2There is also a frequency shift coefficient of about 415cm-1If the wavelength of the pump laser is 1980nm, the output of the Raman laser with 2157nm can be realized.
The continuous pumping laser with the wave band of 1.9 mu m generated by the continuous optical fiber laser pumping source 1 with the wave band of 1.9 mu m is coupled into the fiber core of the hollow-core optical fiber 6 after being input into the optical fiber Bragg grating 4 and the input end fusion point 5 between the solid-core optical fiber and the hollow-core optical fiber at the input end. Pump laser filled in the core of hollow-core optical fiber 62The stimulated Raman scattering effect is generated, and continuous signal light with the wave band of 2 mu m is generated. The residual pump laser passes through an output end fusion point 7 between the output end solid core optical fiber and the hollow core optical fiber, an output optical fiber Bragg grating 8 and a 2# cladding optical filter 9, is coupled to the cladding by a 2# chirped inclined optical fiber grating 10 and then is transmitted, and the residual pump laser transmitted backwards in the cladding is filtered by the 2# cladding optical filter 9. Continuous signal light with a wave band of 2 mu m generated in the fiber core of the hollow-core optical fiber 6 is reflected for multiple times in a resonant cavity formed by the input fiber Bragg grating 4 and the output fiber Bragg grating 8 to form resonance. A part of the 2 μm waveband laser in the resonant cavity is transmitted and output from the output fiber bragg grating 8, and then is output through the 2# cladding optical filter 9 and the 2# chirped tilted fiber grating 10.
Example 9:
fig. 8 is a schematic structural diagram of a third near-infrared fiber gas raman laser oscillator, which is adopted in this embodiment to provide a narrow-linewidth 2 μm-waveband near-infrared fiber gas raman laser oscillator, including a pump source 1, a 1# chirped tilted fiber grating 2, a 1# cladding light filter 3, an input fiber bragg grating 4, an input end fusion point 5, a hollow fiber 6, an output end fusion point 7, an output fiber bragg grating 8, a 2# cladding light filter 9, a 2# chirped tilted fiber grating 10, and a pi-phase shift fiber grating 11.
The pumping source is a continuous fiber laser or a fiber amplifier with a wave band of 1.9 mu m, and the Raman gain gas is D2Gas capable of frequency shifting the 1.9 μm pump laser to the 2 μm band by the stimulated raman scattering effect. The hollow-core optical fiber 6 adopts a hollow-core photonic crystal optical fiber, and the hollow-core optical fiber 6 has very low transmission loss for pump laser with a 1.9 mu m waveband and Raman laser with a 2 mu m waveband, and has higher transmission loss for laser with other wavebands. Take 1950nm pump laser as an example, since D2There is a frequency shift coefficient of about 297cm-1By rotating Raman lines of D2As working gas, 2070nm Raman laser output can be realized; d2There is also a frequency shift coefficient of about 415cm-1If the wavelength of the pump laser is 1980nm, the output of the Raman laser with 2157nm can be realized.
A1.9 mu m continuous fiber laser or an amplifier is used as a pumping source 1, and 1.9 mu m waveband continuous pumping laser generated by the pumping source 1 is coupled into a fiber core of a hollow-core fiber 6 through a 1# chirped inclined fiber grating 2, a 1# cladding light filter 3, an input fiber Bragg grating 4, a pi phase shift fiber grating 11 and an input end fusion point 5 between the solid-core fiber and the hollow-core fiber, which are arranged on the input end solid-core fiber. The fiber core of the hollow-core optical fiber 6 is filled with working gas and simultaneously restrains pumping laser transmission, so that an ideal environment is provided for the interaction of the working gas and the pumping laser. The working gas filled inside the hollow optical fiber 6 is D2A gas. Pump laser filled in the core of hollow-core optical fiber 62The gas generates stimulated Raman scattering effect to generate 2 μm wave band continuous signal light.
The residual pump laser passes through an output end fusion point 7 between the output end solid core optical fiber and the hollow core optical fiber, an output optical fiber Bragg grating 8 and a 2# cladding optical filter 9, a 2# chirped inclined optical fiber grating 10 is coupled to the cladding and then transmitted, and the residual pump laser transmitted backwards in the cladding is filtered through the 2# cladding optical filter 9. Continuous signal light with a wave band of 2 mu m generated in the fiber core of the hollow-core optical fiber 6 is reflected for multiple times in a resonant cavity formed by the input fiber Bragg light 4 and the output fiber Bragg grating 8 to form resonance. In the resonance process, 2 μm waveband signal light is continuously filtered by the pi phase shift fiber grating 11, so that the characteristic of narrow linewidth is always maintained. The micro 2 μm waveband laser is transmitted backwards through the input fiber Bragg grating 4, coupled to the cladding through the 1# chirped and inclined fiber Bragg grating 2, converted into forward transmission, and then filtered through the 1# cladding optical filter 3. And a part of the 2 mu m wave band laser resonated in the resonant cavity is transmitted and output from the output fiber Bragg grating 8 and then output through the 2# cladding optical filter 9 and the 2# chirped inclined fiber grating 10.
Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, a plurality of modifications and decorations without departing from the principle of the present invention should be considered as the protection scope of the present invention.
Claims (10)
1. A near-infrared fiber gas raman laser oscillator, characterized by: the Raman laser comprises a pumping source, an input end grating, a hollow fiber, an output end grating and a pumping light filtering device, wherein the pumping source is used for generating pumping laser, the input end grating, the hollow fiber, the output end grating and the pumping light filtering device are sequentially arranged on a transmission light path of the pumping laser output by the pumping source, the input end grating and the output end grating form a resonant cavity, the pumping laser is coupled into the hollow fiber, Raman gain gas is filled in a fiber core of the hollow fiber, the output end of the hollow fiber is coupled and connected with the output end solid fiber provided with the output end grating and the pumping light filtering device, and the output end solid fiber finally outputs the Raman laser.
2. The near-infrared fiber gas raman laser oscillator of claim 1, wherein: the pumping source is a continuous fiber laser or a fiber amplifier with a wave band of 1 mu m, the Raman gain gas is methane, and the hollow-core fiber adopts an anti-resonance hollow-core fiber.
3. The near-infrared fiber gas raman laser oscillator of claim 2, wherein: the hollow-core optical fiber adopts an anti-resonance hollow-core optical fiber of a node-free type or a connected type.
4. The near-infrared fiber gas raman laser oscillator of claim 1, wherein: the pumping source is a continuous fiber laser or a fiber amplifier with a wave band of 1.55 mu m, and the Raman gain gas is H2Or D2And the hollow-core optical fiber adopts a hollow-core photonic crystal fiber.
5. The near-infrared fiber gas raman laser oscillator of claim 1, wherein: the pumping source is a 1.9 mu m wave band continuous fiber laser or a fiber amplifier, and the Raman gain gas is D2And the hollow-core optical fiber adopts a hollow-core photonic crystal fiber.
6. The near-infrared fiber gas raman laser oscillator according to any one of claims 1 to 5, characterized in that: the pumping light filtering device consists of a chirped inclined fiber grating with the central wavelength being the pumping wavelength and a cladding light filter.
7. The near-infrared fiber gas raman laser oscillator of claim 6, wherein: the input end grating and the output end grating are both fiber Bragg gratings, wherein the input end fiber Bragg grating is a high-reflectivity wide-spectrum grating with the central wavelength of Raman laser wavelength, the output end fiber Bragg grating is a low-reflectivity wide-spectrum grating with the central wavelength of Raman laser wavelength, and both the input end grating and the output end grating are engraved on the solid-core single-mode fiber.
8. The near-infrared fiber gas raman laser oscillator of claim 7, wherein: the hollow optical fiber is connected with the solid single-mode optical fiber with the written input end grating and the solid single-mode optical fiber with the written output end grating in a fusion mode respectively so as to realize the sealing of the gas in the hollow optical fiber.
9. The near-infrared fiber gas raman laser oscillator of claim 6, wherein: the Raman optical filter device is arranged between the pumping source and the input end grating and comprises a chirp inclined fiber grating with the central wavelength being Raman wavelength and a cladding optical filter.
10. The near-infrared fiber gas raman laser oscillator of claim 6, wherein: the narrow linewidth control device is arranged in the resonant cavity; the narrow line width control device is a pi phase shift fiber grating with the central wavelength of Raman wavelength, which is written behind the input end grating.
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| CN113410740B (en) * | 2021-06-18 | 2023-03-14 | 中国人民解放军国防科技大学 | Linear composite cavity structure single-frequency Raman fiber laser |
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