CN102801091B - Random fiber laser - Google Patents
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- CN102801091B CN102801091B CN201210328766.3A CN201210328766A CN102801091B CN 102801091 B CN102801091 B CN 102801091B CN 201210328766 A CN201210328766 A CN 201210328766A CN 102801091 B CN102801091 B CN 102801091B
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Abstract
The invention discloses a random fiber laser system. According to the system, an optical fiber serves as a laser medium, and a fiber laser comprising a crystal fiber laser, a nonlinear fiber laser, a rare earth doped fiber laser and a plastic fiber laser serves as pump light to be coupled into the optical fiber. Because the refractive index of the optical fiber has non-uniformity and is randomly distributed along the optical fiber, so that the photon is subjected to rayleigh scattering during transmission in the optical fiber; and moreover, the pump light provides gain for the backward scattered light along the optical fiber, when the overall gain is greater than the total loss, the backward scattered light is amplified to form random laser. A discrete optical component is not arranged in the light path of the system, so that all-fiber connection is realized. In the system, the residual pump light is returned to the optical fiber, and the distributed weak scattered light is amplified, and therefore, according to the random fiber laser system, the threshold power of the pump light can be reduced, the utilization rate of the pump light can be improved, and the slope efficiency of the laser is improved.
Description
Technical field
The present invention relates to a kind of random fiber laser system.This system, using fiber laser as pumping source, using optical fiber as laser medium, utilizes the Rayleigh back scattering light amplification in optical fiber to form laser, belongs to new pattern laser device field.
Background technology
Sergei K. Turitsyn in the literature, Sergey A. Babin, Atalla E. El-Taher, Paul Harper, Dmitriy V. Churkin, Sergey I. Kablukov, Juan Diego Ania-Castanon, VassilisKaralekas and Evgenii V. Podivilov. Random distributed feedback fibre laser. Nature Photon.2010, introduces a kind of random fiber laser system in 4,231 – 235.In this system, the pump light of the 1455nm of two bundle equal power is from the midpoint coupled into optical fibres (total length of optical fiber is 83km) in opposite direction of optical fiber.The photon transmitting in optical fiber, due to the inhomogeneous generation coherent scattering of refractive index of optical fiber, has formed distributed Rayleigh scattering (RS), and most scattered photon lets out from fiber cores.Only has the backscattered photons of minority along Optical Fiber Transmission.Pump light provides distributed Raman gain along optical fiber.If when the overall gain of backscattered photons is greater than total losses, rear orientation light forms the two ends ejaculation of laser from optical fiber by being exaggerated, and the wavelength of shoot laser is 1550nm.This is the incoherent laser in a kind of space, has important application in a lot of fields.
This Technology Need is improved:
1. Threshold.In said system, need the threshold power of laser higher, reach 1.6W, high like this threshold value, too high to the power requirement of pump light, realize more difficult, so the reduction threshold value of must trying every possible means.
2. the power output of laser needs further to improve.Although power output has reached 150mw, in a lot of application, still cannot meet higher power demand.
3. the utilance of pump light is lower.In said system, total slope efficiency is 30%, should improve as much as possible the slope efficiency of laser.
Summary of the invention
Object of the present invention is exactly the performance index in order to improve random fiber laser, and can make random fiber laser instrumentation.Propose use fiber laser as pump light source, residual pump light has been returned to the scheme that optical fiber amplifies distributed Rayleigh scattering light again.Can reduce laser threshold so on the one hand, can also improve on the other hand power output and the slope efficiency of laser, and be conducive to manufacture practical instrument.
Basic thought of the present invention is as follows:
What the laser medium of accidental laser used is optical fiber, can be optical fiber of monomode fiber, photonic crystal fiber, plastic fiber, doped fiber and other kinds etc.In experiment, inclined-plane is cut at the two ends of optical fiber, to stop the Fresnel reflection being caused by fiber end face to enter fiber core.Pump light is provided by fiber laser, can be Photonic Crystal Fiber Lasers, nonlinear optical fibre laser (Raman fiber lasers and Brillouin optical fiber laser etc.), Rear Earth Doped Fiber Laser and plastic fiber laser etc.Refractive index due to optical fiber in laser medium is inhomogeneous, when light is propagated in optical fiber, Rayleigh scattering can occur, and backward rayleigh scattering coefficient is very little, is approximately δ=4.5 × 10
-5km
-1, therefore, in optical fiber, generally backward rayleigh scattered radiation is negligible.But if optical fiber long enough, and rear orientation light will form laser after being exaggerated.For example: if pump light wavelength is 1455nm, distributed backward Rayleigh scattering light is after Raman amplifies, have maximum gain in 1550nm left and right, be approximately 13THz with respect to the stokes frequency displacement of pump light, so the wavelength of the Random Laser of outgoing is approximately 1550nm left and right; If pump light wavelength is 1455nm, distributed backward Rayleigh scattering light is after Brillouin amplification, having maximum gain in 1455.1nm left and right, is to be approximately 10GHz with respect to the stokes frequency displacement of pump light, so the wavelength of the Random Laser of outgoing is approximately 1455.1nm left and right.
Native system uses fiber laser as pump light source, and the chamber of fiber laser can be linear cavity, can be also annular chamber.Fiber laser is divided into four kinds by gain media: Photonic Crystal Fiber Lasers, nonlinear optical fibre laser (Raman fiber lasers and Brillouin optical fiber laser etc.), Rear Earth Doped Fiber Laser and plastic fiber laser.Fiber laser, due to the advantage such as beam quality, high power, high efficiency and the volume of its high-quality be little, is the more satisfactory pump light source of Random Laser.
1. random fiber laser, is characterized in that, is one of following two schemes:
Scheme one comprises the first semiconductor laser 1, the second semiconductor laser 2, the first coupler 3, the second coupler 4, the 3rd coupler 5, the 4th coupler 6, the first optical fiber 7, the second optical fiber 8, the first fiber grating 9, the second fiber grating 10, the first optical isolator 11, the second optical isolator 12, the 3rd optical isolator 13, pump light speculum 14;
Wherein:
The first semiconductor laser 1 is coupled into the pump light as fiber laser in the first optical fiber 7 by the first coupler 3 and the first fiber grating 9 successively, the second semiconductor laser 2 is coupled into another bundle pump light as fiber laser in the first optical fiber 7 by the second coupler 4 and the second fiber grating 10 successively, the first optical fiber 7 is laser mediums of fiber laser, and the first fiber grating 9 and the second fiber grating 10 form the resonant cavity of fiber laser;
The shoot laser of fiber laser, as the pump light of random fiber laser, is coupled into the second optical fiber 8 through the first optical isolator 11 and the 3rd coupler 5; The second optical fiber 8 is laser mediums of random fiber laser; Second optical fiber 8 one end connect respectively pump light speculum 14 and the second optical isolator 12 through the 4th coupler 6, and the other end connects the 3rd optical isolator 13 by the 3rd coupler 5; In the second optical fiber 8, the rear of generation forms Random Laser to rayleigh scattered radiation after twice is even repeatedly amplified, and exports by the 3rd coupler 5 and the 3rd optical isolator 13;
Scheme two comprises the first semiconductor laser 1, the first coupler 3, the second coupler 4, the 3rd coupler 5, the 4th coupler 6, the first optical fiber 7, the second optical fiber 8, the first optical isolator 11, the second optical isolator 12, the 3rd optical isolator 13, the 4th optical isolator 15, pump light speculum 14, fiber grating 16;
Wherein:
The first semiconductor laser 1 is coupled into the first optical fiber 7 as the pump light of fiber laser by the first coupler 3, the first optical fiber 7 is laser mediums of fiber laser, the first optical fiber 7 connects the first optical isolator 11, the first optical isolator 11 connects one end of the second coupler 4, the second coupler 4 is also connected with fiber grating 16, the second couplers 4 and is connected to the first coupler 3 looping cavity optical fibre lasers;
Fiber laser output light is exported and as the pump light of random fiber laser through the second coupler 4; The second coupler 4 connects the second optical isolator 12, the second optical isolator 12 connects the second optical fiber 8 by the 3rd coupler 5, the second optical fiber 8 is laser mediums of random fiber laser, second optical fiber 8 one end connect respectively pump light speculum 14 through the 4th coupler 6 and the 3rd optical isolator 13, the second optical fiber 8 other ends connect the 4th optical isolator 15 by the 3rd coupler 5; In the second optical fiber 8, the rear of generation forms Random Laser to rayleigh scattered radiation after twice is even repeatedly amplified, and exports by the 3rd coupler 5 and the 4th optical isolator 15.
The first scheme is the random fiber laser system of the fiber laser based on linear cavity.
In this scheme, the pumping source of random fiber laser is the fiber laser of linear cavity.The fiber laser of linear cavity is made up of pumping source, working-laser material (gain media) and laserresonator three parts.Fiber laser is divided into following several by gain media: Photonic Crystal Fiber Lasers, nonlinear optical fibre laser (Raman fiber lasers and Brillouin optical fiber laser etc.), Rear Earth Doped Fiber Laser, plastic fiber laser etc.
Example one: fiber laser can, with rare-earth doped optical fibre as working-laser material, as laser resonant cavity, use semiconductor laser as pumping source with fiber grating.If rare-earth doped optical fibre is ytterbium, ytterbium ion has wider absorption band (800-1064nm) and excitation band (970-1200nm), and the selection of pumping source is more extensive.Have very strong absworption peak according to ytterbium ion absorption spectrum at 976nm and 915nm, so pumping source can use the semiconductor laser of 976nm, the fiber grating at two ends provides feedback for forming laser, forms resonant cavity, and possesses frequency-selecting effect.If the fiber grating of one end is high anti-to 1060nm light, the other end is to the reflection of 1060nm light part, when reaching the laser that after threshold value, exportable wavelength is 1060nm.The 1060nm laser of ytterbium-doping optical fiber laser output is as the pump light coupled into optical fibres of Random Laser, if Rayleigh rear orientation light amplifies and forms Random Laser through Raman.Random Laser produces 13THz frequency displacement with respect to pump light.
Example two: fiber laser is nonlinear optical fiber laser.Nonlinear optical fibre laser is mainly non-linear stimulated Raman scattering and the stimulated Brillouin scattering effect of utilizing in optical fiber.Use highly nonlinear optical fiber as gain media, resonant cavity can be grating pair or annular chamber, and its output wavelength depends on respectively Raman frequency shift and the Brillouin shift of pumping source wavelength and gain media.If Raman fiber lasers, the laser frequency of output is that the laser frequency of pumping source is through the result of Raman frequency shift so.If Brillouin laser, the Random Laser frequency of output is the result of pumping source laser frequency through a Brillouin shift so.Finally the Random Laser of output is if Rayleigh scattering forms after Raman amplifies, and the frequency of Random Laser is the frequency of the nonlinear optical fiber laser result after Raman frequency shift.
Example three: fiber laser is Photonic Crystal Fiber Lasers.Such as the LD pump photon crystal fiber of 915nm obtains the output of 980nm continuous laser.Now the laser of 980nm amplifies through Raman as the pump light coupled into optical fibres of Random Laser, and the frequency displacement that produces 13THz forms Random Laser.Directly as compared with pumping source, the better quality of Photonic Crystal Fiber Lasers Output of laser is more stable with the semiconductor laser of 980nm.
First scheme is the random fiber laser system based on circular cavity optic fibre laser.Circular cavity optic fibre laser has low threshold value, does not have the advantages such as hole burning effect.In annular cavity laser, pumping light passes through in wavelength division multiplexer coupled into optical fibres, then after the energy distribution of coupler, a lasing part is directly exported, and another part is reflected back by fiber grating.Fiber grating plays a part energy back and frequency-selecting as chamber mirror.The laser reflecting back reenters optical fiber through coupler again, forms closed circuit, forms circular cavity optic fibre laser.Working-laser material in circular cavity optic fibre laser can be each type optical fiber.The laser of circular cavity optic fibre laser output is as the pump light coupled into optical fibres of Random Laser, if amplify through Raman, the frequency displacement that produces 13THz, forms Random Laser.
Example one: the laser frequency of Brillouin's annular optical fiber laser output is the laser result that process Brillouin shift obtains in annular chamber that pump laser sends.Brillouin's annular optical fiber laser is the high-coherence light source of utmost point narrow linewidth.Brillouin optical fiber laser all adopts annular chamber mostly.The gain media of Brillouin optical fiber laser can be optical fiber of monomode fiber, highly nonlinear optical fiber, photonic crystal fiber, plastic fiber, doped fiber and other kinds etc.If pump light is coupled in optic fiber ring-shaped cavity by coupler, in the fiber gain medium of annular chamber, can there is stimulated Brillouin scattering, after amplifying, the feedback of annular chamber forms Laser output.Then this laser is as the pump light coupled into optical fibres of random fiber laser, if Rayleigh scattering after Raman amplifies, the frequency displacement that produces 13THz, forms Random Laser.
Example two: rear-earth-doped circular cavity optic fibre laser, as Erbium-doped-fiber Ring Laser, the pumping light of 980nm is coupled in Er-doped fiber by a 980/1550nm wavelength division multiplexer.Fiber bragg grating center wavelength is 1555.10nm, and reflectivity is 99.9%.Last excitation wavelength is 1555.10nm, and then this laser is as the pump light coupled into optical fibres of random fiber laser, if Rayleigh scattering after Raman amplifies, the frequency displacement that produces 13THz, forms Random Laser.
And in order effectively to utilize pump light, the present invention has also adopted round trip to amplify scheme, also residual pump light is reflected back to optical fiber with pump light speculum, and therefore pump light all forms and amplifies Rayleigh rear orientation light in the communication process of former and later two directions.Twice of pump light and even repeatedly pass through gain fibre, makes Rayleigh rear orientation light through repeatedly amplifying, and has improved the slope efficiency of magnification ratio and laser.This random fiber laser system based on fiber laser not only can reduce the threshold value that laser produces, and can also effectively utilize pump light simultaneously, improves the slope efficiency of laser.
Technical scheme of the present invention is as follows:
Scheme one comprises the first semiconductor laser 1, the second semiconductor laser 2, the first coupler 3, the second coupler 4, the 3rd coupler 5, the 4th coupler 6, the first optical fiber 7, the second optical fiber 8, the first fiber grating 9, the second fiber grating 10, the first optical isolator 11, the second optical isolator 12, the 3rd optical isolator 13, pump light speculum 14.Wherein:
The first semiconductor laser 1 and the second semiconductor laser 2 are as the pump light source of fiber laser, be coupled in the first optical fiber 7 and formed fiber laser by the first coupler 3 and the second coupler 4 respectively, the first optical fiber 7 can be the optical fiber of photonic crystal fiber, highly nonlinear optical fiber, plastic fiber, rare-earth doped optical fibre or other kind.The first fiber grating 9 and the second fiber grating 10 form resonant cavity, and have frequency-selecting effect.The shoot laser of fiber laser, as the pump light of random fiber laser, is coupled into the second optical fiber 8 through the first optical isolator 11 and the 3rd coupler 5.The second optical fiber 8 can be the optical fiber of photonic crystal fiber, highly nonlinear optical fiber, plastic fiber, rare-earth doped optical fibre or other kind.The Rayleigh scattering light producing in the second optical fiber 8 if will produce laser after Raman amplifies, and sharp light frequency is that fiber laser output light frequency produces the result after 13THz frequency displacement.In order to improve laser utilance, after residual pump light is reflected by pump light speculum 14, through the 4th coupler 6, be coupled in the second optical fiber 8, back scattering rayleigh radiation is after twice is even repeatedly amplified, export by the 3rd coupler 5 and the 3rd optical isolator 13, thereby obtain Random Laser.The second optical isolator 12 is in order to stop the reverberation that fiber end face causes to enter in optical fiber.Wherein the first coupler 3, the second coupler 4, the 3rd coupler 5, the 4th coupler 6 can be wavelength division multiplexer, circulator or other optical passive components of satisfying the demand.
Scheme two comprises the first semiconductor laser 1, the first coupler 3, the second coupler 4, the 3rd coupler 5, the 4th coupler 6, the first optical fiber 7, the second optical fiber 8, the first optical isolator 11, the second optical isolator 12, the 3rd optical isolator 13, the 4th optical isolator 15, pump light speculum 14, fiber grating 16.Wherein:
It can be the optical fiber of photonic crystal fiber, highly nonlinear optical fiber, plastic fiber, rare-earth doped optical fibre or other kind that the laser that the first semiconductor laser 1 sends is coupled into the first optical fiber 7, the first optical fiber 7 by the first coupler 3.The first optical isolator 11 can make light one-way transmission.After the energy distribution of the second coupler 4, a part of laser is reflected back in annular chamber via fiber grating 16, and another part is as the Laser output of fiber laser.Output light, as the pump light of random fiber laser, is coupled in the second optical fiber 8 via the second optical isolator 12 and the 3rd coupler 5.The second optical fiber 8 can be the optical fiber of photonic crystal fiber, highly nonlinear optical fiber, plastic fiber, rare-earth doped optical fibre or other kind.The Rayleigh scattering light producing in the second optical fiber 8 if will produce Random Laser after Raman amplifies.The frequency of Random Laser is by the result that is fiber laser Output of laser frequency shift 13THz.In order to improve laser utilance, after residual pump light is reflected by pump light speculum 14, be coupled in the second long optical fibers 8 through the 4th coupler 6, back scattering rayleigh radiation is after twice is even repeatedly amplified, export by the 3rd coupler 5 and the 4th optical isolator 15, thereby obtain Random Laser.The 3rd optical isolator 13 is in order to stop the reverberation that fiber end face causes to enter in optical fiber.Wherein the first coupler 3, the second coupler 4, the 3rd coupler 5, the 4th coupler 6 can be wavelength division multiplexer, circulator or other optical passive components of satisfying the demand.
Beneficial effect of the present invention mainly contains:
One, this random fiber laser system is used fiber laser that good beam quality, good stability, efficiency the are high pump light source as Random Laser, makes that whole random fiber laser system has that volume is little, good stability, is easy to the advantages such as integrated.
Two, native system can be that one way can be also that scheme is amplified in round trip pumping, residual pump light comes back to optical fiber after being reflected by pump light speculum, twice of pump light and even repeatedly pass through gain fibre, make Rayleigh rear orientation light through repeatedly amplifying, so native system can make the threshold value of laser be controlled at below 1.6W, the power output of laser is more than 150mW, and the slope efficiency of laser reaches 15%.
Accompanying drawing explanation
Fig. 1 is scheme one invention technological system schematic diagram.
In figure: 1. the first semiconductor laser, 2. the second semiconductor laser, 3. the first coupler, 4. the second coupler, 5. the 3rd coupler, 6. the 4th coupler, 7. the first optical fiber, 8. the second optical fiber, 9. the first fiber grating, 10. the second fiber grating, 11. first optical isolators, 12. second optical isolators, 13. the 3rd optical isolators, 14. pump light speculums.
Fig. 2 is scheme two invention technological system schematic diagrams.
In figure: 1. the first semiconductor laser, 3. the first coupler, 4. the second coupler, 5. the 3rd coupler, 6. the 4th coupler, 7. the first optical fiber, 8. the second optical fiber, 11. first optical isolators, 12. second optical isolators, 13. the 3rd optical isolators, 15. the 4th optical isolators, 14. pump light speculums, 16. fiber gratings.
Embodiment
First by reference to the accompanying drawings the embodiment of 1 pair of system schema one is described in detail below:
It in this programme, is the random fiber laser system based on linear cavity fiber laser, system, referring to Fig. 1, comprises the first semiconductor laser 1, the second semiconductor laser 2, the first coupler 3, the second coupler 4, the 3rd coupler 5, the 4th coupler 6, the first optical fiber 7, the second optical fiber 8, the first fiber grating 9, the second fiber grating 10, the first optical isolator 11, the second optical isolator 12, the 3rd optical isolator 13, pump light speculum 14.
Linear cavity fiber laser is made up of the first semiconductor laser 1, the second semiconductor laser 2, the first coupler 3, the second coupler 4, the first optical fiber 7, the first fiber grating 9, the second fiber grating 10.The laser that the first semiconductor laser 1 and the second semiconductor laser 2 are launched, as the pump light source of fiber laser, is coupled in the first optical fiber 7 by the first coupler 3 and the second coupler 4 respectively, and the first optical fiber 7 is the laser mediums in fiber laser.The first optical fiber 7 can be the optical fiber of photonic crystal fiber, highly nonlinear optical fiber, plastic fiber, rare-earth doped optical fibre or other kind.The first fiber grating 9 and the second fiber grating 10 form the resonant cavity of fiber laser, and have frequency-selecting effect.The fiber laser being made up of said elements can be Photonic Crystal Fiber Lasers, nonlinear optical fibre laser (Raman fiber lasers and Brillouin optical fiber laser etc.), plastic fiber laser, Rear Earth Doped Fiber Laser etc. according to the difference of gain media.Pump light by fiber laser emitting laser as random fiber laser, is coupled in the second optical fiber 8 through the first optical isolator 11 and the 3rd coupler 5.The second optical fiber 8 is gain medias of random fiber laser, and the second optical fiber 8 can be the optical fiber of photonic crystal fiber, highly nonlinear optical fiber, plastic fiber, rare-earth doped optical fibre or other kind.Inclined-plane is cut at the second optical fiber 8 two ends, enters fiber core with the Fresnel reflection light that stops the pump light being caused by fiber end face.Rayleigh rear orientation light in the second optical fiber 8 if will produce Random Laser after Raman amplifies.The frequency of Random Laser has 13THz frequency displacement with respect to pumping light frequency.In order to improve laser utilance, residual pump light is reflected by pump light speculum 14, through the 4th coupler 6, is coupled in the second optical fiber 8.In the second optical fiber 8 produce rear to rayleigh scattered radiation through twice even repeatedly amplify after, export by the 3rd coupler 5 and the 3rd optical isolator 13, thereby obtain Random Laser.The second optical isolator 12 is in order to stop the reverberation that fiber end face causes to enter in optical fiber.
The last embodiment of 2 pairs of system schemas two is by reference to the accompanying drawings described in detail:
It in this programme, is the accidental laser system based on ring property cavity optical fibre laser, system, referring to Fig. 2, comprises the first semiconductor laser 1, the first coupler 3, the second coupler 4, the 3rd coupler 5, the 4th coupler 6, the first optical fiber 7, the second optical fiber 8, the first optical isolator 11, the second optical isolator 12, the 3rd optical isolator 13, the 4th optical isolator 15, pump light speculum 14, fiber grating 16.
Circular cavity optic fibre laser is made up of the first semiconductor laser 1, the first coupler 3, the first optical fiber 7, the first optical isolator 11 and the second coupler 4.The laser that the first semiconductor laser 1 sends is coupled into the first optical fiber 7 by the first coupler 3.The first optical fiber 7 can be the optical fiber of photonic crystal fiber, highly nonlinear optical fiber, plastic fiber, rare-earth doped optical fibre or other kind.The first optical isolator 11 can make light one-way transmission.Light in the first optical fiber 7 is after port output of the second coupler 4 and reflect via fiber grating 16, after return via the second coupler 4 again, then transmit looping chamber through the first coupler 3 and the first optical fiber 7.The laser forming is exported by the another port of the second coupler 4.Circular cavity optic fibre laser can be Photonic Crystal Fiber Lasers, nonlinear optical fibre laser (Raman fiber lasers and Brillouin optical fiber laser etc.), plastic fiber laser, Rear Earth Doped Fiber Laser etc.The laser of being exported by circular cavity optic fibre laser, as the pump light of random fiber laser, is coupled in the second optical fiber 8 via the second optical isolator 12 and the 3rd coupler 5.The second optical fiber 8 is gain medias of random fiber laser.The second optical fiber 8 can be the optical fiber of photonic crystal fiber, highly nonlinear optical fiber, plastic fiber, rare-earth doped optical fibre or other kind.Inclined-plane is cut at the second optical fiber 8 two ends, enters fiber core with the Fresnel reflection light that stops the pump light being caused by fiber end face.Rayleigh rear orientation light in the second optical fiber 8 if will produce Random Laser after Raman amplifies.The frequency of Random Laser has 13THz frequency displacement with respect to pumping light frequency.In order to improve laser utilance, residual pump light is reflected by pump light speculum 14, through the 4th coupler 6, is coupled in the second optical fiber 8.In the second optical fiber 8 produce rear to rayleigh scattered radiation through twice even repeatedly amplify after, export by the 3rd coupler 5 and the 4th optical isolator 15, thereby obtain Random Laser.The 3rd optical isolator 13 is in order to stop the reverberation that fiber end face causes to enter in optical fiber.
In the time that light transmits in optical fiber, due to the inhomogeneous generation coherent scattering of refractive index of fiber medium, form distributed Rayleigh scattering (RS), most scattered photon lets out from fiber cores, only has the backscattered photons of minority along Optical Fiber Transmission.If pump light has produced distributed gain in optical fiber.If when the overall gain of rear orientation light is greater than total losses, backward scattered photon is just exaggerated formation laser.The frequency of shoot laser is relevant with amplification type, if Raman amplifies, the frequency of the Random Laser of generation is the result that pumping light frequency moves down 13THz.
Realization in order to demonstrate the invention, has described above-mentioned instantiation.But other variations of the present invention and modification, it will be apparent to those skilled in the art that, all belong to claim protection range of the present invention in the present invention without any modification/variation within the scope of essence and the basic principle of disclosure or imitation conversion.
Claims (3)
1. random fiber laser, is characterized in that, is one of following two schemes:
Scheme one comprises the first semiconductor laser, the second semiconductor laser, the first coupler, the second coupler, the 3rd coupler, the 4th coupler, the first optical fiber, the second optical fiber, the first fiber grating, the second fiber grating, the first optical isolator, the second optical isolator, the 3rd optical isolator, pump light speculum;
Wherein:
The first semiconductor laser is coupled into the pump light as fiber laser in the first optical fiber by the first coupler and the first fiber grating successively, the second semiconductor laser is coupled into another bundle pump light as fiber laser in the first optical fiber by the second coupler and the second fiber grating successively, the first optical fiber is the laser medium of fiber laser, the resonant cavity of the first fiber grating and the second fiber grating composition fiber laser;
The shoot laser of fiber laser, as the pump light of random fiber laser, is coupled into the second optical fiber through the first optical isolator and the 3rd coupler; The second optical fiber is the laser medium of random fiber laser; Second optical fiber one end connects respectively pump light speculum and the second optical isolator through the 4th coupler, and the other end connects the 3rd optical isolator by the 3rd coupler; What in the second optical fiber, produce forms Random Laser to rayleigh scattered radiation afterwards after twice is even repeatedly amplified, by the output of the 3rd coupler and the 3rd optical isolator;
Scheme two comprises the first semiconductor laser, the first coupler, the second coupler, the 3rd coupler, the 4th coupler, the first optical fiber, the second optical fiber, the first optical isolator, the second optical isolator, the 3rd optical isolator, the 4th optical isolator, pump light speculum, fiber grating;
Wherein:
The first semiconductor laser is coupled into the first optical fiber as the pump light of fiber laser by the first coupler, the first optical fiber is the laser medium of fiber laser, the first optical fiber connects the first optical isolator, the first optical isolator connects one end of the second coupler, the second coupler is also connected with fiber grating, and the second coupler is connected to the first coupler looping cavity optical fibre laser;
Fiber laser output light is through the second coupler output and as the pump light of random fiber laser; The second coupler connects the second optical isolator, the second optical isolator connects the second optical fiber by the 3rd coupler, the second optical fiber is the laser medium of random fiber laser, second optical fiber one end connects respectively pump light speculum and the 3rd optical isolator through the 4th coupler, and the second optical fiber other end connects the 4th optical isolator by the 3rd coupler; What in the second optical fiber, produce forms Random Laser to rayleigh scattered radiation afterwards after twice is even repeatedly amplified, by the output of the 3rd coupler and the 4th optical isolator.
2. random fiber laser according to claim 1, is characterized in that: the first coupler, the second coupler, the 3rd coupler, the 4th coupler are wavelength division multiplexer or circulator.
3. random fiber laser according to claim 1, is characterized in that: the first optical fiber and the second optical fiber are photonic crystal fiber, highly nonlinear optical fiber, plastic fiber or rare-earth doped optical fibre.
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| CN103022866A (en) * | 2012-12-17 | 2013-04-03 | 北京化工大学 | Modulated oscillator power amplifier (MOPA) type random fiber optic laser device |
| CN103762485A (en) * | 2014-01-21 | 2014-04-30 | 中国计量学院 | Multi-wavelength optical fiber laser based on chirp grating and random distribution feedback |
| CN103825169A (en) * | 2014-03-03 | 2014-05-28 | 中国计量学院 | Fiber laser based on doped fiber random phase shift raster |
| CN103825170A (en) * | 2014-03-03 | 2014-05-28 | 杭州光络科技有限公司 | Random distributed feedback fiber laser based on semiconductor optical amplifier |
| CN106848815B (en) * | 2017-01-19 | 2023-10-13 | 中国人民解放军国防科学技术大学 | High-power random fiber laser based on hydrogen-carrying fiber |
| CN107809058B (en) | 2017-11-16 | 2020-09-04 | 太原理工大学 | Monolithic integrated semiconductor random laser |
| JP7355945B2 (en) | 2020-09-24 | 2023-10-03 | 株式会社フジクラ | fiber laser equipment |
| CN113540948B (en) * | 2021-06-30 | 2023-04-18 | 深圳公大激光有限公司 | Polarization-maintaining random green light and ultraviolet light laser |
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| CN2901348Y (en) * | 2006-06-01 | 2007-05-16 | 上海交通大学 | High power erbium doped optical fiber light source based on reciprocating double range double pump |
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| CN102437500B (en) * | 2011-12-02 | 2013-03-13 | 北京化工大学 | Random fiber laser with tunable wavelength |
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| CN2901348Y (en) * | 2006-06-01 | 2007-05-16 | 上海交通大学 | High power erbium doped optical fiber light source based on reciprocating double range double pump |
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