CN206422378U - A kind of high-power random fiber laser based on inclined optical fiber grating - Google Patents
A kind of high-power random fiber laser based on inclined optical fiber grating Download PDFInfo
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- CN206422378U CN206422378U CN201720073959.7U CN201720073959U CN206422378U CN 206422378 U CN206422378 U CN 206422378U CN 201720073959 U CN201720073959 U CN 201720073959U CN 206422378 U CN206422378 U CN 206422378U
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Abstract
The utility model is related to a kind of high-power random fiber laser based on inclined optical fiber grating; based on the special index distribution of inclined optical fiber grating; the second order Raman light transmitted in fibre core is coupled as to the cladding mode or radiation mode of reverse transfer; so as to suppress second order Raman light " starting of oscillation ", limitation of the second order Raman light generation to laser output power is broken through.Basic composition includes：Pumping source, inclined optical fiber grating and passive optical fiber.The high-power random fiber laser breaks through limitation of the generation of second order Raman light in traditional random fiber laser to laser output power, further the power output of lifting random fiber laser.
Description
Technical field
The invention belongs to Fiber laser technology field, and in particular to a kind of high-power random light based on inclined optical fiber grating
Fibre laser.
Background technology
Random fiber laser provides accidental distributed feedback using Rayleigh scattering faint in passive optical fiber over long distances, together
The nonlinear effect of stimulated Raman scattering (SRS) provides gain in the passive optical fiber of Shi Liyong, realizes in " resonance free chamber ", " no increasing
Laser output under the conditions of beneficial optical fiber ".Due to providing random feedback using the Rayleigh scattering in Disordered Media, it is not necessary to strict
Cavity resonator structure, random fiber laser have it is simple in construction, without longitudinal mode, high conversion efficiency, smooth spectrum the features such as, be laser
The study hotspot of technical field.The random optical-fiber laser research of early stage is main in face of fields, laser work(such as communication, sensing, imagings
Rate demand is not high, typically within watt level；In recent years, with the lifting of pumpage and continuing to optimize for laser parameter, with
Machine optical fiber laser has been carried out hectowatt grade power output, is expected to turn into a kind of novel high-power optical fiber source.
In the research process of early stage, the length of passive optical fiber is general more than several kilometers in random fiber laser, with
Ensure sufficient distributed Feedback.Theoretical research shows that the passive optical fiber of random fiber laser structure middle and long distance causes high-order
The threshold value of Raman light is relatively low, thus power output reaches after certain level that second order Raman light can quickly produce and cause single order to draw
Graceful luminous power can not be lifted, and this is that random optical fiber laser output power lifts topmost limiting factor at present.Second order Raman light
Generation can also reduce the light light conversion efficiency of laser., can be using shortening fiber lengths to realize that more power is exported
Method improves the generation threshold value of second order Raman light, and current hectowatt grade above high power random fiber laser is typically all using hundreds of
Meter Chang Du passive optical fiber.But shortening fiber lengths can cause accidental distributed feedback to weaken, while can also improve laser
Go out photo threshold, add the difficulty of high-power output.
The random fiber laser of early stage does not need any feedback device such as grating, thus be referred to as " standard-sized sheet chamber " structure with
Machine optical fiber laser.In recent years, researcher proposes to tie by introducing high reflective grid, i.e. " partly beginning to speak " in one end of laser
Structure, theoretical and experimental study shows that " partly beginning to speak " structure can reduce out photo threshold, improving laser device efficiency, and cause originally
The Random Laser of transmitted in both directions is exported from single-end optical fiber in " standard-sized sheet chamber " structure, advantageously in practical application.
However, shortening the length of passive optical fiber and introducing " is partly begun to speak " structure, laser can only be all improved to a certain extent
The power output of device, after power ascension is to certain threshold value, can still produce second order Raman light, and then limit the output of laser
Power and efficiency.
The content of the invention
The purpose of the present invention is to propose to the high-power random fiber laser based on inclined optical fiber grating, tradition is broken through random
Limitation of the generation of second order Raman light to laser output power in optical fiber laser, further lifts random fiber laser
Power output.Its basic thought is：Based on the special index distribution of inclined optical fiber grating, by the second order Raman transmitted in fibre core
Optocoupler is combined into the cladding mode or radiation mode of reverse transfer, so as to suppress second order Raman light " starting of oscillation ", breaks through second order Raman light and produces
Limitation to laser output power.High-power random fiber laser constitute substantially including：Pumping source, inclined optical fiber grating and
Passive optical fiber, the output end of pumping source and one end of inclined optical fiber grating are connected by the way of welding, tilt optical fiber light
The other end of grid is connected with passive optical fiber by the way of welding；The other end sharping of passive optical fiber is to suppress this end face
Feedback, and as the output end of Random Laser, the optical fiber of pumping source output terminal, inscribes optical fiber and quilt used in inclined optical fiber grating
Dynamic optical fiber is consistent.
Now to each part the characteristics of, is described as follows：
Pumping source：Can be that the semiconductor laser or solid of conventional optical fiber laser or fiber coupling swashs
Light device.Laser is exported by fiber coupling, and the diameter of fiber core is consistent with the diameter of passive fiber core, the numerical value of fiber core
Aperture is consistent with the numerical aperture of passive fiber core, and the centre wavelength of laser, line width, polarization characteristic do not have particular/special requirement；It is defeated
Go out power more than 10 watts, to realize random optical-fiber laser high-power output.
Inclined optical fiber grating：Inscribe in a fiber, the optical fiber is consistent with the parameter of passive optical fiber described hereinafter, the work of grating
Make the line width that line width is more than pumping laser, the operation wavelength λ of grating2The second order Raman light of the centre wavelength of correspondence pumping laser,
Can be according to the central wavelength lambda of pumping laser1And following formula is determined：λ=λ1+λ1×λ1×Δυ÷c,λ2=λ+λ × λ ×
Δ υ ÷ c, wherein Δ υ=13.2THz are the Raman frequency shift in silica-based optical fiber, and c is the light velocity.
Passive optical fiber：Conventional silica-based optical fiber, is made up of fibre core, covering and coat.Pump light and the laser produced
Transmitted in fibre core, transmission loss is less than 1dB/ kilometers.
The composition of the high-power random fiber laser can also include wavelength division multiplexer, and wavelength division multiplexer is arranged on pump
Between Pu source and inclined optical fiber grating.Specially：The output end of pumping source and the pumping end of wavelength division multiplexer use the side of welding
Formula is connected, and the common port of wavelength division multiplexer and one end of inclined optical fiber grating are connected by the way of welding, is tilted
The other end of fiber grating is connected with passive optical fiber by the way of welding；The other end sharping of passive optical fiber is to suppress
Facet feedback, and as the output end of Random Laser, the signal end of wavelength division multiplexer is also the output end of Random Laser.Pumping source
The optical fiber of output end, inscribe used in optical fiber, wavelength division multiplexer pumping end, signal end and common port used in inclined optical fiber grating
Optical fiber is consistent with passive optical fiber.
Compared with conventional art, the present invention breaches the power ascension technical bottleneck of second order Ramam effect introducing, can be achieved
More power is exported, with advanced and practicality.
Brief description of the drawings
Fig. 1 is structural representation Fig. 1 of the high-power random fiber laser of the invention based on inclined optical fiber grating,
Fig. 2 is structural representation Fig. 2 of the high-power random fiber laser of the invention based on inclined optical fiber grating.
Embodiment
The present invention is further described with reference to diagram.High-power random fiber laser shown in Fig. 1 includes
Pumping source (2), (4) 3 parts of inclined optical fiber grating (3) and passive optical fiber.Wherein the output end of pumping source (2) is with tilting optical fiber
One end of grating (3) is connected by the way of welding, and the other end and the passive optical fiber (4) of inclined optical fiber grating (3) are used
The mode of welding is connected；The other end sharping of passive optical fiber (4) is used as the defeated of Random Laser to suppress facet feedback
Go out end.The optical fiber of pumping source (2) output end, the optical fiber inscribed used in inclined optical fiber grating (3) are consistent with passive optical fiber (4).Figure
In " x " represent fusion point, " " represent sharping.
Fig. 2 is another implementation of high-power random fiber laser, and it includes pumping source (2), tilts optical fiber light
Grid (3) and passive optical fiber (4), (5) 4 parts of wavelength division multiplexer.The wherein output end of pumping source (2) and wavelength division multiplexer (5)
Pumping end connected by the way of welding, one end of the common port and inclined optical fiber grating (3) of wavelength division multiplexer (5) is adopted
Connected with the mode of welding, the other end and the passive optical fiber (4) of inclined optical fiber grating (3) are connected by the way of welding
Connect；The other end sharping of passive optical fiber (4) is used as the output end of Random Laser, wavelength division multiplexer to suppress facet feedback
(5) signal end is also the output end of Random Laser.The optical fiber, inscription inclined optical fiber grating (3) of pumping source (2) output end are used
Optical fiber, wavelength division multiplexer (5) pumping end, signal end and common port used in optical fiber it is consistent with passive optical fiber (4).In figure
" x " represents fusion point, " " represent sharping.
The corresponding specific embodiment of two kinds of structural representations of the invention is given below：
For the high-power random fiber laser shown in Fig. 1, pumping source (2) is ytterbium-doping optical fiber laser, and it, which is exported, swashs
Center wavelength of light is 1070nm, and power output is 1000 watts, and 10dB line widths are 5nm.The output end optical fiber of pumping source (2) is double-contracting
Layer optical fiber, core diameter is 20 μm, and numerical aperture is 0.06；After inclined optical fiber grating (3), 1070nm laser is about 980
Watt (general consider 2% or so loss), the operation wavelength of inclined optical fiber grating (3) is 1178nm, and 10dB line widths are 6nm；Quilt
The length of dynamic optical fiber (4) is 500 meters, and transmission loss is 0.3dB/ kilometers, and core diameter is 20 μm, and numerical aperture is 0.06, defeated
Go out end and cut 8 degree of oblique angles.The accidental distributed feedback and stimulated Raman scattering provided by Rayleigh scattering faint in passive optical fiber
The gain of offer, can be achieved 1120nm single order Raman light outputs；Due to the presence of inclined optical fiber grating (3), 1120nm single orders are drawn
The corresponding 1178nm second orders Raman light of graceful light will be converted into cladding mode or radiation mode, it is impossible to be transmitted in fibre core, therefore not
Second order Raman light " starting of oscillation " can be triggered.In view of the Excited state of 1070nm laser to 1120nm laser, under ideal case, laser
Conversion efficiency up to 95%；The loss of inclined optical fiber grating and the transmission loss of optical fiber are deducted, can be obtained more than 900 watts
Random optical-fiber laser output.Higher than the highest output of 200 watts of power output this random optical-fiber lasers of current open report
Performance number.
For the high-power random fiber laser shown in Fig. 2, pumping source (2) is ytterbium-doping optical fiber laser, and it, which is exported, swashs
Center wavelength of light is 1070nm, and power output is 1000 watts, and 10dB line widths are 5nm.The output end optical fiber of pumping source (2) is double-contracting
Layer optical fiber, core diameter is 10 μm, and numerical aperture is 0.12；After wavelength division multiplexer (5) and inclined optical fiber grating (3),
1070nm laser is about 950 watts (losses of general consideration 5% or so), and the operation wavelength of inclined optical fiber grating (3) is 1178nm,
10dB line widths are 6nm；The pumping end operation wavelength of wavelength division multiplexer (5) is 1070nm, and active line is wider than 5nm, signal end work
Make wavelength for 1120nm, active line is wider than 5nm, common port energy simultaneous transmission 1070nm and 1120nm laser；Passive optical fiber
(4) length is 300 meters, and transmission loss is 0.3dB/ kilometers, and core diameter is 10 μm, and numerical aperture is 0.12, and output end cuts 8
Spend oblique angle.The increasing that the accidental distributed feedback and stimulated Raman scattering provided by Rayleigh scattering faint in passive optical fiber is provided
Benefit, can be achieved 1120nm single order Raman light outputs；Due to the presence of inclined optical fiber grating (3), 1120nm single orders Raman light correspondence
1178nm second orders Raman light will be converted into cladding mode or radiation mode, it is impossible to transmitted in fibre core, therefore two will not be triggered
Rank Raman light " starting of oscillation ".In view of the Excited state of 1070nm laser to 1120nm laser, under ideal case, the conversion effect of laser
Rate is up to 95%；The loss of inclined optical fiber grating and the transmission loss of optical fiber are deducted, the random light more than 900 watts can be obtained
Fine laser output.Higher than the maximum power output value of 200 watts of power output this random optical-fiber lasers of current open report.
Claims (5)
1. a kind of high-power random fiber laser based on inclined optical fiber grating, by the second order Raman optical coupling transmitted in fibre core
For the cladding mode or radiation mode of reverse transfer, so that suppress second order Raman light " starting of oscillation ", including：Pumping source, inclined optical fiber grating
With passive optical fiber, it is characterised in that the output end of pumping source and one end of inclined optical fiber grating are connected by the way of welding
Connect, the other end of inclined optical fiber grating is connected with passive optical fiber by the way of welding；The other end of passive optical fiber is cut tiltedly
Angle is used as the output end of Random Laser, optical fiber, the inscription inclined optical fiber grating of pumping source output terminal to suppress this facet feedback
Optical fiber used is consistent with passive optical fiber.
2. a kind of high-power random fiber laser based on inclined optical fiber grating according to claim 1, the pumping
Source：Can be conventional optical fiber laser or the semiconductor laser or solid state laser of fiber coupling, laser is by light
Fibre coupling output, the diameter of fiber core is consistent with the diameter of passive fiber core, the numerical aperture of fiber core and passive light
The numerical aperture of long and slender core is consistent, and the centre wavelength of laser, line width, polarization characteristic do not have particular/special requirement；Power output is more than 10
Watt, to realize random optical-fiber laser high-power output.
3. a kind of high-power random fiber laser based on inclined optical fiber grating according to claim 1, the inclination
Fiber grating：Inscribe in a fiber, the optical fiber is consistent with the parameter of passive optical fiber, and the active line of grating is wider than pumping laser
Line width, the operation wavelength λ of grating2The second order Raman light of the centre wavelength of correspondence pumping laser, can be according to the center of pumping laser
Wavelength X1And following formula is determined：λ=λ1+λ1×λ1×Δυ÷c, λ2=λ+λ×λ×Δυ÷ c, wherein Δυ=13.2
THz is the Raman frequency shift in silica-based optical fiber,cFor the light velocity.
4. a kind of high-power random fiber laser based on inclined optical fiber grating according to claim 1, described passive
Optical fiber：Conventional silica-based optical fiber, is made up of fibre core, covering and coat, and pump light and the laser produced are transmitted in fibre core.
5. a kind of high-power random fiber laser based on inclined optical fiber grating according to claim 1, the big work(
The composition of rate random fiber laser can also include wavelength division multiplexer, and wavelength division multiplexer is arranged on pumping source and inclined optical fiber grating
Between, it is specially：The output end of pumping source and the pumping end of wavelength division multiplexer are connected by the way of welding, wavelength-division multiplex
The common port of device and one end of inclined optical fiber grating are connected by the way of welding, the other end and quilt of inclined optical fiber grating
Dynamic optical fiber is connected by the way of welding；The other end sharping of passive optical fiber to suppress this facet feedback, and as with
The output end of machine laser, the signal end of wavelength division multiplexer is also the output end of Random Laser, the optical fiber of pumping source output terminal, inscription
The optical fiber used in optical fiber, wavelength division multiplexer pumping end, signal end and common port used in inclined optical fiber grating with passive optical fiber
Unanimously.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106549292A (en) * | 2017-01-19 | 2017-03-29 | 中国人民解放军国防科学技术大学 | A kind of high-power random fiber laser based on inclined optical fiber grating |
| CN108493748A (en) * | 2018-04-03 | 2018-09-04 | 电子科技大学 | Ytterbium-Raman hybrid gain random fiber laser is mixed based on fibre core pumping |
| CN109193337A (en) * | 2018-10-29 | 2019-01-11 | 中国人民解放军国防科技大学 | Stimulated Raman scattering inhibition method for high-power optical fiber laser amplifier system |
| US20220149583A1 (en) * | 2020-11-09 | 2022-05-12 | Sichuan Guangsheng Iot Technology Co., Ltd. | Narrow-band, Low-noise Raman Fiber Laser with A Random Fiber Laser Pump |
-
2017
- 2017-01-19 CN CN201720073959.7U patent/CN206422378U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106549292A (en) * | 2017-01-19 | 2017-03-29 | 中国人民解放军国防科学技术大学 | A kind of high-power random fiber laser based on inclined optical fiber grating |
| CN108493748A (en) * | 2018-04-03 | 2018-09-04 | 电子科技大学 | Ytterbium-Raman hybrid gain random fiber laser is mixed based on fibre core pumping |
| CN108493748B (en) * | 2018-04-03 | 2020-04-17 | 电子科技大学 | ytterbium-Raman mixed gain random fiber laser based on fiber core pumping |
| CN109193337A (en) * | 2018-10-29 | 2019-01-11 | 中国人民解放军国防科技大学 | Stimulated Raman scattering inhibition method for high-power optical fiber laser amplifier system |
| US20220149583A1 (en) * | 2020-11-09 | 2022-05-12 | Sichuan Guangsheng Iot Technology Co., Ltd. | Narrow-band, Low-noise Raman Fiber Laser with A Random Fiber Laser Pump |
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