CN111200231A - High-power all-fiber random laser device - Google Patents
High-power all-fiber random laser device Download PDFInfo
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- CN111200231A CN111200231A CN202010031676.2A CN202010031676A CN111200231A CN 111200231 A CN111200231 A CN 111200231A CN 202010031676 A CN202010031676 A CN 202010031676A CN 111200231 A CN111200231 A CN 111200231A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/1086—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering using scattering effects, e.g. Raman or Brillouin effect
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Abstract
The application relates to a high-power all-fiber random laser device. The device comprises: forward output, backward output, fiber oscillator and passive biography can optic fibre, backward output and fiber oscillator backward be connected, fiber oscillator and passive biography can optic fibre be connected, passive biography can optic fibre and forward output connection. The invention can realize high-power laser output.
Description
Technical Field
The application relates to the technical field of high-power optical fiber lasers, in particular to a high-power all-fiber random laser device.
Background
Random fiber lasers based on raman gain have received extensive attention from researchers at home and abroad since the 2010 proposal. Unlike conventional lasers, random lasers do not have a well-defined cavity, and their feedback is provided by randomly distributed rayleigh scattering in the fiber. Due to the randomness of feedback, the output random laser is incoherent light, and therefore the random laser can keep better stability in the time domain. On the other hand, theoretical research shows that the random fiber laser based on the raman gain can realize high-power and high-efficiency output by using a short cavity structure, a new implementation scheme is provided for obtaining high-power laser, and in addition, the random laser has high time domain stability, the random fiber laser based on the raman gain can be used as a seed source of a high-power amplifier, and even directly generates high-power and high-brightness laser.
At present, the direct output power of random laser is close to kilowatt magnitude, but a plurality of problems still exist in subsequent power increase, and the problems mainly include generation of high-order Stokes light, four-wave mixing effect caused by intermode dispersion, power bearing capacity of devices such as fiber gratings and the like. The scheme for realizing high-power random laser which is reported at present mainly adopts a semi-open cavity structure of a fiber core pump, the high fiber core power density enables the spectrum broadening caused by self-phase modulation and nonlinear effects such as four-wave mixing to easily occur, and the Raman effect has a wide gain spectrum, so that the spectrum of the generated random laser easily exceeds the reflection bandwidth of a high-reflection grating in the semi-open cavity, and the efficiency and the system safety of a laser are influenced.
Disclosure of Invention
Therefore, it is necessary to provide a high power all-fiber random laser device capable of solving the problems of low efficiency and low system safety of the current random laser.
A high power all-fiber random laser apparatus, said apparatus comprising: the passive energy transfer optical fiber comprises a forward output end, a backward output end, an optical fiber oscillator and a passive energy transfer optical fiber;
the backward output end is connected with the optical fiber oscillator backward;
the optical fiber oscillator is connected with the passive energy transmission optical fiber;
the passive energy transmission optical fiber is connected with the forward output end.
In one embodiment, the method further comprises the following steps: the optical fiber oscillator includes: the device comprises a pumping source, a pumping/signal beam combiner, a forward fiber grating, a backward fiber grating and an ytterbium-doped fiber; the pumping source, the pumping/signal combiner, the forward fiber grating, the ytterbium-doped fiber and the backward fiber grating are connected in sequence; the reflectivity of the forward fiber grating is greater than that of the backward fiber grating; the backward output end is connected with the pumping/signal beam combiner or the forward fiber bragg grating backward; and the passive energy-transfer optical fiber is connected with the pumping/signal beam combiner or the backward fiber grating.
In one embodiment, the method further comprises the following steps: the pump source includes: a forward pump source and a backward pump source; the pump/signal combiner comprises a forward pump/signal combiner and a backward pump/signal combiner; the forward output end is connected with a signal input arm of the forward pump/signal combiner; the forward pump source is connected with a pump input arm of the forward pump/signal beam combiner; the signal output arm of the forward pump/signal beam combiner is connected with the forward fiber grating; the passive energy transfer optical fiber is connected with a signal output arm of the backward pumping/signal beam combiner; the backward pumping source is connected with a pumping input arm of the backward pumping/signal beam combiner; the signal input arm of the backward pumping/signal beam combiner is connected with the backward fiber bragg grating; the backward fiber grating and the forward fiber grating are respectively connected with the ytterbium-doped fiber.
In one embodiment, the method further comprises the following steps: the pump source is a forward pump source; the pumping/signal combiner is a forward pumping/signal combiner; the forward output end is connected with a signal input arm of the forward pump/signal combiner; the forward pump source is connected with a pump input arm of the forward pump/signal beam combiner; the signal output arm of the forward pump/signal beam combiner is connected with the forward fiber grating; and the passive energy transmission optical fiber is connected with the backward fiber grating.
In one embodiment, the method further comprises the following steps: the pumping source is a backward pumping source; the pumping/signal combiner is a backward pumping/signal combiner; the passive energy transfer optical fiber is connected with a signal output arm of the backward pumping/signal beam combiner; the backward pumping source is connected with a pumping input arm of the backward pumping/signal beam combiner; the signal input arm of the backward pumping/signal beam combiner is connected with the backward fiber bragg grating; and the backward output end is connected with the forward fiber bragg grating backward. .
In one embodiment, the method further comprises the following steps: the passive energy transmission optical fiber is a large mode field germanium-doped optical fiber; the size of the fiber core of the large mode field germanium-doped optical fiber is consistent with that of the gain optical fiber in the optical fiber oscillator; the size of the fiber core is selected to be 15-50 μm; the size of the inner cladding of the large-mode-field germanium-doped optical fiber is selected to be 250-900 μm; the length of the large-mode-field germanium-doped optical fiber is selected to be 30-300 m.
In one embodiment, the method further comprises the following steps: the cut angle of the backward output end is selected to be 0-12 degrees, and the backward output end also comprises a coated end cap with 99 percent of reflectivity aiming at random laser wavelength.
In one embodiment, the method further comprises the following steps: the cut angle of the forward output is selected to be greater than 8 °, and the forward output further comprises a coated end cap having greater than 99% transmission for random laser wavelengths.
In one embodiment, the method further comprises the following steps: the reflectivity of the forward fiber grating is more than 99%, and the reflectivity of the backward fiber grating is 5% -20%.
In one embodiment, the method further comprises the following steps: the ytterbium-doped fiber is a double-clad large mode field fiber, the size of the fiber core is 15-50 μm, the size of the inner cladding is 250-900 μm, and the absorption coefficient is 1-5 dB/m at the wavelength of 976 nm.
According to the high-power all-fiber random laser device, the filter device sensitive to the random laser band and the low-bearing power device in the traditional system are eliminated, the short plate limitation of high-power output is eliminated structurally, and meanwhile, the problem that the random laser spectrum exceeds the effective bandwidth of the filter device due to spectrum broadening is avoided. The device of the invention does not have a low-power device which has spectrum limitation on random laser, and the generated random laser can be transmitted in the whole optical fiber light path without loss by designing the optical fiber oscillator for pumping and the fiber core parameters of the passive energy transmission optical fiber generated by the random laser, thereby enabling high-power output. Meanwhile, the device has the advantages of simple structure and reliable performance in terms of the using number of the devices.
Drawings
FIG. 1 is a block diagram of a high power all-fiber random laser apparatus according to one embodiment;
FIG. 2 is a schematic diagram of an embodiment of a high power all-fiber random laser device;
FIG. 3 is a schematic diagram of another embodiment of a high power all-fiber random laser apparatus;
fig. 4 is a schematic structural diagram of a high-power all-fiber random laser device in yet another embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, there is provided a high power all-fiber random laser apparatus comprising: the laser comprises a forward output end 101, a backward output end 102, a fiber oscillator 103 and a passive energy-transfer fiber 104, wherein the forward output end 101 and the backward output end 102 are respectively used for outputting high-power random lasers in different directions. The fiber oscillator 102 may adopt a conventional fiber oscillator, and the fiber oscillator 103 receives a high-power semiconductor laser pump source, converts the high-power semiconductor laser pump source into laser with a specific wavelength, and transmits the laser with the specific wavelength to the passive energy transmission fiber 104, where the laser with the specific wavelength undergoes distributed feedback and stimulated raman scattering in the passive energy transmission fiber 104, so that the wavelength of the laser is increased to generate random laser.
In the high-power all-fiber random laser device, the filter device sensitive to the random laser band and the low-bearing power device in the traditional system are eliminated, so that the short plate limitation of high-power output is eliminated structurally, and the problem that the random laser spectrum exceeds the effective bandwidth of the filter device due to spectrum broadening is avoided. The device of the invention does not have a low-power device which has spectrum limitation on random laser, and the generated random laser can be transmitted in the whole optical fiber light path without loss by designing the optical fiber oscillator for pumping and the fiber core parameters of the passive energy transmission optical fiber generated by the random laser, thereby enabling high-power output. Meanwhile, the device has the advantages of simple structure and reliable performance in terms of the using number of the devices.
In one embodiment, a fiber oscillator includes: the pump source, the pump/signal combiner, the forward fiber grating, the backward fiber grating and the ytterbium-doped fiber are sequentially connected, the reflectivity of the backward fiber grating is greater than that of the forward fiber grating, the backward output end is connected with the signal arm of the pump/signal combiner or the backward fiber grating backward, and the passive energy-transfer fiber is connected with the signal arm of the pump/signal combiner or the forward fiber grating. In this embodiment, the ytterbium-doped fiber is selected as the gain fiber of the fiber oscillator, and structurally, a grating is added to the conventional random laser to output the random laser in one direction. And in the embodiment, the fiber grating is eliminated, so that the basic structure is simpler, and meanwhile, a narrow-band spectrum limiting device is not arranged, so that the output power can be higher.
In one embodiment, as shown in fig. 2, a schematic block diagram of a high power all-fiber random laser device is provided, wherein the pump source comprises: forward pumping sources 21-26 and backward pumping sources 71-76; the pump/signal combiner comprises a forward pump/signal combiner 31 and a backward pump/signal combiner 32; the backward output end 11 is connected with a signal input arm of the forward pump/signal combiner 31; the forward pumping sources 21-26 are connected with the pumping input arm of the forward pumping/signal beam combiner 31; the signal output arm of the forward pump/signal combiner 31 is connected with the forward fiber grating 41; the passive energy-transfer optical fiber 6 is connected with a signal output arm of the backward pump/signal beam combiner 32; the backward pumping sources 71-76 are connected with the pumping input arm of the backward pumping/signal beam combiner 32; the signal input arm of the backward pump/signal beam combiner 32 is connected with a backward fiber grating 42; the backward fiber grating 42 and the forward fiber grating 41 are respectively connected to the ytterbium-doped fiber 5.
In this embodiment, the backward pump sources 71 to 76 inject pump light into the ytterbium-doped fiber 5 through the backward pump/signal combiner 32 and the backward fiber grating 42, the forward pump sources 21 to 26 inject pump light into the ytterbium-doped fiber 5 through the forward pump/signal combiner 31 and the forward fiber grating 41, laser with a specific wavelength is generated in the ytterbium-doped fiber 5 through feedback of the gratings, the laser with the specific wavelength is transmitted to the passive energy-transfer fiber 6 through a fiber core, the laser with the specific wavelength is converted into random laser with a longer wavelength through distributed feedback and stimulated raman scattering in the passive energy-transfer fiber 6, and the random laser is output from the backward output end 11 and the forward output end 12.
In yet another embodiment, as shown in FIG. 3, a schematic structure diagram of another high-power all-fiber random laser device is provided, wherein the pumping sources are forward pumping sources 21-26; the pump/signal combiner is a forward pump/signal combiner 31; the backward output end 11 is connected with a signal input arm of the forward pump/signal combiner 31; the forward pumping sources 21-26 are connected with the pumping input arm of the forward pumping/signal beam combiner 31; the signal output arm of the forward pump/signal combiner 31 is connected with the forward fiber grating 41; the passive energy transmission optical fiber 6 is connected with the backward fiber grating 42.
In this embodiment, the forward pump sources 21 to 26 inject pump light into the ytterbium-doped fiber 5 through the forward pump/signal combiner 31 and the forward fiber grating 41; laser with specific wavelength is generated in the ytterbium-doped fiber 5 through feedback of the forward fiber grating 41, the laser with specific wavelength is transmitted to the passive energy transmission fiber 6 along the fiber core, and the laser with specific wavelength is gradually converted into random laser with longer wavelength through distributed feedback and stimulated Raman scattering in the passive energy transmission fiber 6 and is output from the forward output end 12 and the backward output end 11.
In another embodiment, as shown in FIG. 4, a schematic structure diagram of another high-power all-fiber random laser device is provided, wherein the pumping sources are backward pumping sources 71-76; the pump/signal combiner is a backward pump/signal combiner 32; the passive energy-transfer optical fiber 6 is connected with a signal output arm of the backward pump/signal beam combiner 32; the backward pumping sources 71-76 are connected with the pumping input arm of the backward pumping/signal beam combiner 32; the signal input arm of the backward pump/signal beam combiner 32 is connected with a backward fiber grating 42; the backward output end 11 is backward connected to the forward fiber grating 41.
In this embodiment, the backward pump sources 71-76 inject pump light into the ytterbium-doped fiber 5 through the backward pump/signal combiner 32 and the backward fiber grating 42; laser with specific wavelength is generated in the ytterbium-doped fiber 5 through feedback of the grating, the laser with the specific wavelength is transmitted to the passive energy transmission fiber 6 along the fiber core, and the laser with the specific wavelength is gradually converted into random laser with longer wavelength through distributed feedback and stimulated Raman scattering in the passive energy transmission fiber and is output from the forward output end 12 and the backward output end 11.
It should be noted that the pump/signal combiner shown as 6 pump input arms in the present invention can select pump/signal combiners of other specifications according to the requirement, and the number is not limited herein.
Specifically, the specific wavelength can be 1050nm-1100nm, and the passive energy transmission fiber 6 can be gradually converted into random laser with the wavelength of 1110nm-1160 nm.
In particular, the pump source may also be selected from a plurality of wavelengths, such as: 915nm wavelength pump source, 976nm wavelength pump source, or 1018nm wavelength pump source.
Specifically, the wavelength of the laser corresponding to the specific wavelength is 1050nm to 1100nm, and the forward fiber grating and the backward fiber grating are 1050nm to 1100nm high-reflectivity fiber grating and 1050nm to 1100nm low-reflectivity fiber grating respectively.
Specifically, the gain fiber of the fiber oscillator is an ytterbium-doped fiber, the ytterbium-doped fiber is a double-clad large mode field fiber, the size of the fiber core can be 15-50 μm, the size of the inner cladding is selected from 250-900 μm, and the absorption coefficient can be a value between 1dB/m and 5dB/m at the wavelength of 976 nm.
In one embodiment, the passive energy transfer fiber is a large mode field germanium-doped fiber; the size of the fiber core of the large mode field germanium-doped optical fiber is consistent with that of the gain optical fiber in the optical fiber oscillator; the size of the fiber core is selected to be 15-50 μm; the size of the inner cladding of the large-mode-field germanium-doped optical fiber is selected to be 250-900 μm; the length of the large-mode-field germanium-doped fiber is selected to be 30-300 m.
In one embodiment, the cut angle of the backward output is selected to be 0-12, and the backward output further comprises a coated end cap having a reflectivity of greater than 99% for random laser wavelengths.
In one embodiment, the cut angle of the forward output is selected to be greater than 8 °, and the forward output further comprises a coated end cap having greater than 99% transmission for random laser wavelengths.
The invention is illustrated below in three specific examples.
Applied to the structure shown in fig. 2, comprising a backward output end 11 cut at an oblique angle of 8 degrees, a 1064nm high-power ytterbium-doped fiber laser system, namely a fiber oscillator mode, an 20/400 μm double-clad germanium-doped fiber 6, and a forward output end 12 cut at an oblique angle of 8 degrees. Further, the 1064nm high-power ytterbium-doped fiber laser system comprises 976nm forward pump sources 21-26, (6+1) × 1 forward pump/signal combiner 31, a 1064nm high-reflectivity fiber grating 41 (reflectivity 99%), an 20/400 μm double-clad ytterbium-doped fiber 5, a 1064nm low-reflectivity fiber grating 42 (reflectivity 10%), (6+1) × 1 backward pump/signal combiner 32, and 976nm backward pump sources 71-76. The 20/400 μm double-clad germanium-doped fiber 6 has a length of 200 m. The 20/400 μm double-clad ytterbium-doped fiber 5 had an absorption coefficient of 1.2dB/m @976nm and a length of 20 m. The total power of 976nm forward pump sources 21-26 and backward pump sources 71-76 is 2.2 kW. The 1120nm waveband random laser output with the forward output power larger than 1kW can be obtained by the embodiment.
Applied to the structure of FIG. 3, backward pumping sources 71-76 and a backward pumping/signal beam combiner 32 are removed on the basis of FIG. 2, and the total power of forward pumping sources 21-26 is kept to be 2.2 kW. The 1120nm waveband random laser output with the forward output power larger than 1kW can be obtained by the embodiment.
Applied to the structure of FIG. 4, the forward pump sources 21-26 and the backward pump/signal combiner 31 are removed on the basis of FIG. 2, and the total power of the backward pump sources 71-76 is kept to be 2.2 kW. The 1120nm waveband random laser output with the forward output power larger than 1kW can be obtained by the embodiment.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A high power all-fiber random laser apparatus, said apparatus comprising: the passive energy transfer optical fiber comprises a forward output end, a backward output end, an optical fiber oscillator and a passive energy transfer optical fiber;
the backward output end is connected with the optical fiber oscillator backward;
the optical fiber oscillator is connected with the passive energy transmission optical fiber;
the passive energy transmission optical fiber is connected with the forward output end.
2. The apparatus of claim 1, wherein the fiber oscillator comprises: the device comprises a pumping source, a pumping/signal beam combiner, a forward fiber grating, a backward fiber grating and an ytterbium-doped fiber;
the pumping source, the pumping/signal combiner, the forward fiber grating, the ytterbium-doped fiber and the backward fiber grating are connected in sequence; the reflectivity of the forward fiber grating is greater than that of the backward fiber grating;
the backward output end is connected with the pumping/signal beam combiner or the forward fiber bragg grating backward;
and the passive energy-transfer optical fiber is connected with the pumping/signal beam combiner or the backward fiber grating.
3. The apparatus of claim 2, wherein the pump source comprises: a forward pump source and a backward pump source; the pump/signal combiner comprises a forward pump/signal combiner and a backward pump/signal combiner;
the backward output end is connected with a signal input arm of the forward pump/signal beam combiner;
the forward pump source is connected with a pump input arm of the forward pump/signal beam combiner;
the signal output arm of the forward pump/signal beam combiner is connected with the forward fiber grating;
the passive energy transfer optical fiber is connected with a signal output arm of the backward pumping/signal beam combiner;
the backward pumping source is connected with a pumping input arm of the backward pumping/signal beam combiner;
the signal input arm of the backward pumping/signal beam combiner is connected with the backward fiber bragg grating;
the backward fiber grating and the forward fiber grating are respectively connected with the ytterbium-doped fiber.
4. The apparatus of claim 2, wherein the pump source is a forward pump source; the pumping/signal combiner is a forward pumping/signal combiner;
the forward output end is connected with a signal input arm of the forward pump/signal combiner;
the forward pump source is connected with a pump input arm of the forward pump/signal beam combiner;
the signal output arm of the forward pump/signal beam combiner is connected with the forward fiber grating;
and the passive energy transmission optical fiber is connected with the backward fiber grating.
5. The apparatus of claim 2, wherein the pump source is a backward pump source; the pumping/signal combiner is a backward pumping/signal combiner;
the passive energy transfer optical fiber is connected with a signal output arm of the backward pumping/signal beam combiner;
the backward pumping source is connected with a pumping input arm of the backward pumping/signal beam combiner;
the signal input arm of the backward pumping/signal beam combiner is connected with the backward fiber bragg grating;
the forward output end is connected with the forward fiber bragg grating in a backward direction.
6. The apparatus of any one of claims 1 to 5, wherein the passive energy transfer fiber is a large mode field germanium-doped fiber;
the size of the fiber core of the large mode field germanium-doped optical fiber is consistent with that of the gain optical fiber in the optical fiber oscillator; the size of the fiber core is selected to be 15-50 μm;
the size of the inner cladding of the large-mode-field germanium-doped optical fiber is selected to be 250-900 μm;
the length of the large-mode-field germanium-doped optical fiber is selected to be 30-300 m.
7. The apparatus of any of claims 1 to 5, wherein the cut angle of the backward output is selected to be 0 ° -12 °, and the backward output further comprises a coated end cap having 99% reflectivity for random laser wavelengths.
8. The apparatus of any of claims 1 to 5, wherein the cut angle of the forward output end is selected to be greater than 8 °, the forward output end further comprising a coated end cap having greater than 99% transmission for random laser wavelengths.
9. The apparatus according to any one of claims 2 to 5, wherein the forward fiber grating has a reflectivity of greater than 99% and the backward fiber grating has a reflectivity of 5% -20%.
10. The apparatus of any of claims 2 to 5, wherein the ytterbium-doped fiber is a double-clad large mode field fiber, the core size is chosen to be 15 μm to 50 μm, the inner cladding size is chosen to be 250 μm to 900 μm, and the absorption coefficient is chosen to be between 1dB/m and 5dB/m at a wavelength of 976 nm.
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