CN106229804B - A kind of large-power optical fiber base pure-tone pulse laser - Google Patents
A kind of large-power optical fiber base pure-tone pulse laser Download PDFInfo
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- CN106229804B CN106229804B CN201610818728.4A CN201610818728A CN106229804B CN 106229804 B CN106229804 B CN 106229804B CN 201610818728 A CN201610818728 A CN 201610818728A CN 106229804 B CN106229804 B CN 106229804B
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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
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] 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
- H01S3/109—Frequency multiplication, e.g. harmonic generation
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Abstract
The invention discloses a kind of large-power optical fiber base pure-tone pulse lasers, including pumping source, bundling device, broadband fiber gratings, thermoelectric cooler TEC, input collimator, nonlinear crystal, temperature controlling stove, output collimator, high-gain Yb dosed optical fiber, narrowband polarization-maintaining fiber grating, PZT piezoelectric ceramics, dichroic mirror.The present invention is based on linear intonation Q mode and inner cavity frequency-doubling structures, and 960 ~ 980nm of wavelength, single longitudinal mode (single-frequency) basic frequency laser may be implemented.Wise temperature adjusting is carried out by two thermoelectric cooler TEC and PZT piezoelectric ceramics is stretched come the accurate Wavelength matched state for manipulating fiber grating pair, can then be realized with modulating resonance cavity loss and be adjusted the output of Q pure-tone pulse basic frequency laser；Furthermore by improving the harmonic generation efficiency and output power of frequency doubling Blue-light for centimetre length nonlinear crystal and inner cavity frequency-doubling structure, the final pure-tone pulse laser output realized based on fiber form.
Description
Technical field
The present invention relates to optical fiber lasers, are based especially on the linear chamber of centimetres and inner cavity frequency-doubling structure, are pressed with PZT
Electroceramics electrostriction and thermoelectric cooler TEC sectional temperature control adjust the single-frequency blue light pulse laser of Q.
Background technique
Single frequency optical fiber laser can operate at single longitudinal mode state, not only with general optical fiber laser good heat dissipation,
The features such as high-efficient, compact-sized, and have the advantages that output spectrum line width, noise are low, threshold value is low etc..However, in shortwave
In the case that (< 0.8 μm) shortage gain media of section directly can generate laser, second_harmonic generation (SHG) frequency multiplication is that acquisition is short
The effective means of wave band of laser light source.Especially frequency multiplication 980nm single-mode laser can obtain optical data storage, colored display, sea
The 490nm blue light that the numerous areas such as bottom imaging, subsurface communication need.For frequency multiplication process, using pulse fundamental frequency light
It (i.e. increase fundamental frequency light peak power) or nonlinear crystal is placed in basic frequency laser resonant cavity carries out frequency-doubled conversion, Ke Yiti
Its high harmonic generation efficiency and output power.Current research blue laser is based primarily upon frequency multiplication of outer-cavity structure, opposite using spectrum width
Wider (GHz magnitude) conventional solid laser or optical fiber laser are as fundamental frequency light source progress frequency multiplication, but system structure is more multiple
It is miscellaneous, stability is poor, harmonic generation efficiency is lower.Ytterbium light is mixed as Zou et al. mixes the pumping of Nd:YAG crystal laser using 946nm
Fibre obtains 1.32W, 980nm fundamental frequency light, then utilizes bismuth borate (BIBO) crystal and frequency multiplication of outer-cavity structure, realize 15mW,
490nm contineous blue light exports [Appl.Phys.B, 2009,95:685].In addition, Creeden et al. uses 1946nm pulse fiber
Laser and two block period poled lithium niobate (PPLN) crystal realize the output of 2W pulsed blue using frequency multiplication of outer-cavity structure
[Proc. of SPIE, 2015,9728:972829], transfer efficiency about 16%.Relevant patent has: (1) 2013 year, Shandong
Hai Fu photon Science and Technology Co., Ltd. has applied for the patent [publication number: CN 103545702A] of pure-tone pulse blue light source, benefit
Tune Q is carried out with the polarization direction of piezoelectric element periodically pressing gain fibre modulation 978nm fundamental frequency light, nonlinear crystal is placed in
Outside resonant cavity, the output of frequency multiplication of outer-cavity pure-tone pulse blue laser is realized, but required blue laser does not have entirely
Optical fiber characteristic, and structure is more complex.(2) 2015 years, Institute of Semiconductors,Academia Sinica applied for tunable blue laser
The patent [publication number: CN 105428986A] of device, it is real using 808nm semiconductor laser frequency multiplication sector polarization cycle crystal
Tunable frequency doubling Blue-light laser output is showed, but required blue laser does not have single-frequency and pulse output special
Property.
Summary of the invention
The purpose of the invention is to overcome the prior art, provide a kind of based on fiber form and in resonance
It is intracavitary to generate efficient large-power optical fiber base pure-tone pulse laser.
The purpose of the present invention is realized at least through one of following technical solution.
A kind of large-power optical fiber base pure-tone pulse laser, including pumping source, bundling device, broadband fiber gratings, the first heat
Electric refrigerator TEC, input collimator, nonlinear crystal, temperature controlling stove (such as Miniature precision temperature controlling stove), output collimator, high-gain
Yb dosed optical fiber, narrowband polarization-maintaining fiber grating, PZT piezoelectric ceramics, the second thermoelectric cooler TEC, dichroic mirror.Knot between each component
Structure relationship is: wherein the pumping input terminal of the tail optical fiber of the pumping source and bundling device connects, the signal output end of bundling device with
Broadband fiber gratings connection, broadband fiber gratings are connected through one end of input collimator and nonlinear crystal, nonlinear crystal
The other end is connect through output collimator with one end of high-gain Yb dosed optical fiber, the other end and narrowband polarization-maintaining of high-gain Yb dosed optical fiber
One end of fiber grating connects, and the other end of narrowband polarization-maintaining fiber grating is connect with dichroic mirror.Wherein the first thermoelectric cooler TEC
The side of broadband fiber gratings, narrowband polarization-maintaining fiber grating is separately fixed at TEC 2；PZT piezoelectric ceramics is fixed on narrowband guarantor
The side of inclined fiber grating.
The pumping source is semiconductor laser, the optical fiber laser or other solid that wave-length coverage is 900 ~ 930nm
State laser is that single transverse mode or more transverse modes export, and specific pumping wavelength is according to doping with rare-earth ions type and level structure
It is selected accordingly.
The broadband fiber gratings are high to 900 ~ 930nm of pump light wavelength thoroughly, and transmissivity is between 70% ~ 99.9%；It is right
960 ~ 980nm of basic frequency laser and blue light wavelength are both high anti-, and between 70 ~ 99.9%, 3dB reflection spectrum width is reflectivity
0.01~20nm。
The input collimator and output collimator are ultrashort focus type, and focal length is 0.5 ~ 5cm, to fundamental frequency, blue light
Laser plays the role of collimation, coupling.
The nonlinear crystal is periodically poled lithium niobate (LiNbO3) or lithium tantalate (LiTaO3) crystal, shape is
Block or waveguide type structure are 0.5 ~ 5cm using length.
The high-gain Yb dosed optical fiber is double-clad structure, and the gain at 960 ~ 980nm wavelength is greater than 1dB/cm；
Its specifically used length is selected according to laser output power, single longitudinal mode state, reflectance spectrum of narrowband polarization-maintaining fiber grating etc.,
It the use of length is generally 0.2 ~ 20cm.
The narrowband polarization-maintaining fiber grating both partially reflects 960 ~ 980nm of basic frequency laser and blue light wavelength,
For the reflectivity of the two central wavelength between 10 ~ 80%, it is 0.01 ~ 1nm that 3dB, which reflects spectrum width,.
The PZT piezoelectric ceramics is fixed on the side of narrowband polarization-maintaining fiber grating, applies biased electrical to PZT piezoelectric ceramics
It presses signal to realize flexible, then the central wavelength of narrowband polarization-maintaining fiber grating is adjusted and is controlled.
The dichroic mirror is high to pulsed blue wavelength thoroughly, and transmissivity is greater than 90%, to 960 ~ 980nm of basic frequency laser and pump
Pu 900 ~ 930nm of light wave band is all that height is anti-, and reflectivity is greater than 90%.
The present invention uses short straight chamber and inner cavity frequency-doubling structure, by broadband fiber gratings, centimetre length high-gain Yb dosed optical fiber
Laser resonator is constituted with narrowband polarization-maintaining fiber grating.Wherein made using highly doped and high gain characteristics yb-doped double-clad fiber
For laser medium material, acted on using the frequency-selecting of broadband fiber gratings and narrowband polarization-maintaining fiber grating, by designing narrowband polarization-maintaining
The reflection spectrum width of fiber grating and the chamber for controlling resonant cavity are long, under the lasting pumping of pumping source, can produce in laser resonator
Single-frequency 960 ~ 980nm basic frequency laser is excited in life.Since the central wavelength of fiber grating pair is influenced by temperature, stress,
The wave of fiber grating pair is accurately manipulated using thermoelectric cooler TEC and the PZT piezo ceramic element being placed in above fiber grating
Long matching status, and then the loss intracavitary to laser resonance is modulated.The second thermoelectric cooler TEC is to narrowband polarization-maintaining light first
Fine grating carries out temperature adjusting, changes the central wavelength of narrowband polarization-maintaining fiber grating, makes its reflectance spectrum with broadband fiber gratings
Generate mismatch state.Secondly without load signal above PZT piezoelectric ceramics, and pass through TEC pairs of the first thermoelectric cooler
Broadband fiber gratings carry out temperature adjusting, change the wave-length coverage and drift bearing of broadband fiber gratings, are further exacerbated by narrowband
Polarization-maintaining fiber grating central wavelength with broadband grating reflectance spectrum mismatched degree, so that basic frequency laser lasing will not be generated.Again
It is secondary after be loaded with proper signal above PZT piezoelectric ceramics, so that the central wavelength and broadband light of narrowband polarization-maintaining fiber grating
There is corresponding matching in the reflectance spectrum of fine grating, thus laser generation is formed in resonant cavity.When load a cycle signal
On PZT piezoelectric ceramics, so that it may obtain the output of Q impulse basic frequency laser.Nonlinear crystal is especially placed in fundamental frequency to swash
Carry out frequency multiplication in optical cavity, it is intracavitary exist simultaneously single-frequency fundamental frequency pulse laser, nonlinear second harmonic generates process, can be with
Realize compact-sized, high conversion efficiency single-frequency blue light pulse laser output.
Compared with prior art, the invention has the advantages that and technical effect:
Centimetres high-gain Yb dosed optical fiber, nonlinear crystal are used as laser working medium and inner cavity times respectively by the present invention
Frequency medium.Single-frequency basic frequency laser resonant cavity is by high-gain Yb dosed optical fiber, broadband fiber gratings, narrowband polarization-maintaining fiber grating together group
At wherein broadband fiber gratings and narrowband polarization-maintaining fiber grating are used as front and back hysteroscope.Under the continuous pump of pumping source, in fibre core
Mix ytterbium light emitting ionic occur population inversion, generate stimulated radiation；Pass through the anti-of design and fabrication narrowband polarization-maintaining fiber grating
Penetrate spectrum width, and the chamber of the entire resonant cavity of control is long, can produce wavelength 960 ~ 980nm single-frequency basic frequency laser.On the one hand it utilizes
The characteristics of central wavelength of fiber grating is by temperature, stress influence, first by the second thermoelectric cooler TEC to narrowband polarization-maintaining
Fiber grating carries out temperature adjusting, changes the central wavelength of narrowband polarization-maintaining fiber grating, makes its reflection with broadband fiber gratings
Compose existing mismatch state；Then temperature adjusting is carried out to broadband fiber gratings by the first thermoelectric cooler TEC, changes broadband
The wave-length coverage and drift bearing of fiber grating further increase narrowband polarization-maintaining fiber grating central wavelength and broadband fiber gratings
Reflectance spectrum generates unmatched degree, thus will not starting of oscillation output basic frequency laser.On the other hand the volume of PZT piezoelectric ceramics is utilized
The characteristics of by load effect of signals, changes narrowband polarization maintaining optical fibre light by load signal and generating to stretch to PZT piezoelectric ceramics
The length of grid, to change its central wavelength, so that narrowband polarization-maintaining fiber grating central wavelength is with broadband fiber gratings reflectance spectrum
Corresponding matching is generated, basic frequency laser oscillation is formed.It, can since load a cycle signal is on PZT piezoelectric ceramics
The intracavitary loss of modulating resonance (i.e. tune Q effect), so that it may obtain the output of pulse single-frequency basic frequency laser.Finally by will be non-linear
Crystal is placed in the pulse laser resonant cavity under high power density operating, and basic frequency laser and blue light repeatedly lead under the action of hysteroscope
Crystal is crossed, higher harmonic generation efficiency and output power effect can be obtained, finally realizes compact-sized, fiber form list
The output of frequency blue light pulse laser.
Detailed description of the invention
Fig. 1 is large-power optical fiber base pure-tone pulse laser schematic illustration in the embodiment of the present invention.
In figure: 1-pumping source, 2-bundling devices, 3-broadband fiber gratings, the 4-the first thermoelectric cooler TEC, 5-inputs
Collimator, 6-nonlinear crystals, 7-Miniature precision temperature controlling stoves, 8-output collimators, 9-high-gain Yb dosed optical fibers, 10-is narrow
Band polarization-maintaining fiber grating, 11-PZT piezoelectric ceramics, the 12-the second thermoelectric cooler TEC, 13-dichroic mirrors.
Specific embodiment
The invention will be further described with specific example with reference to the accompanying drawing, it should be noted that claimed
Range be not limited to the range that embodiment is stated, if having below especially be described in detail place, be art technology
Personnel can refer to prior art realization.
As shown in Figure 1, large-power optical fiber base pure-tone pulse laser includes pumping source, bundling device, broadband fiber gratings,
One thermoelectric cooler TEC, input collimator, nonlinear crystal, temperature controlling stove (Miniature precision temperature controlling stove can be used), output collimation
Device, high-gain Yb dosed optical fiber, narrowband polarization-maintaining fiber grating, PZT piezoelectric ceramics, the second thermoelectric cooler TEC, dichroic mirror.Each portion
Structural relation between part is: wherein the pumping input terminal of the tail optical fiber of the pumping source and bundling device connects, the letter of bundling device
Number output end is connect with broadband fiber gratings, and broadband fiber gratings are connected through one end of input collimator and nonlinear crystal, non-
The other end of linear crystal is connect through output collimator with one end of high-gain Yb dosed optical fiber, the other end of high-gain Yb dosed optical fiber
It is connect with one end of narrowband polarization-maintaining fiber grating, the other end of narrowband polarization-maintaining fiber grating is connect with dichroic mirror.Wherein the first heat
Electric refrigerator TEC and TEC 2 is separately fixed at the side of broadband fiber gratings, narrowband polarization-maintaining fiber grating；PZT piezoelectric ceramics is solid
It is scheduled on the side of narrowband polarization-maintaining fiber grating.Wherein pumping source 1 is multimode semiconductor laser, and output state is continuous defeated
Out, using forward pumping mode.Pumping wavelength is 915nm, pump power 10W in this example.Wherein bundling device 2 is (2+1) × 1
Pumping input optical fibre is directly drawn cone to be fused to above doubly clad optical fiber inner cladding and carries out pumping function by form, i.e. 2 pump ports
The coupling of rate.Wherein broadband fiber gratings 3 are high to pump light 915nm wavelength thoroughly, and transmissivity is greater than 99.9% in this example；To fundamental frequency
Laser 976nm wavelength and 488nm blue light wavelength are both high anti-, and reflectivity is all larger than 99.5%, 3dB reflectance spectrum in this example
Width is less than 0.5nm.It wherein inputs collimator 5 and output collimator 8 is ultrashort focal length, this example mid-focal length is 0.5cm.It is wherein non-thread
Property crystal 6 be periodically poled lithium niobate (LiNbO3) or lithium tantalate (LiTaO3) crystal, shape be block or waveguide type structure,
Nonlinear crystal is waveguide type periodically poled lithium niobate crystal (LiNbO in this example3), it the use of length is 1cm.Wherein high-gain is mixed
Gain of the ytterbium optical fiber 9 at 960 ~ 980nm wavelength is greater than 1dB/cm and uses length for 0.2 ~ 20cm, in 976nm wave in this example
The gain of strong point is 10dB/cm, the use of length is 0.5cm.Wherein narrowband polarization-maintaining fiber grating 10 is to basic frequency laser 976nm wavelength
It is both partially reflected with 488nm blue light wavelength, reflectivity is respectively greater than 10% and 50% in this example, to basic frequency laser 976nm
The 3dB reflection spectrum width of wavelength is 0.1nm.Wherein PZT piezoelectric ceramics 11 is fixed on the side of narrowband polarization-maintaining fiber grating 10, right
PZT piezoelectric ceramics applies biasing voltage signal and realizes flexible, the central wavelength of adjusting and control narrowband polarization-maintaining fiber grating.Wherein
Dichroic mirror 13 is high to pulse 488nm blue light wavelength thoroughly, and transmissivity is greater than 99% in this example；To basic frequency laser 976nm wavelength and pumping
Light 915nm wavelength is all that height is anti-, and reflectivity is all larger than 99.9%.Working media by high-gain Yb dosed optical fiber 9 as laser, by
Broadband fiber gratings 3 and narrowband polarization-maintaining fiber grating 10 form the front and back hysteroscope of short F-P resonant cavity.Multimode semiconductor laser 1
The pump light of output is inputted through the pumping end of bundling device 2, then is coupled to high-gain through broadband fiber gratings 3, nonlinear crystal 6 and is mixed
In the inner cladding of ytterbium optical fiber 9, and fibre core is passed through repeatedly with refractive Iy, it is anti-to form population after being absorbed by ytterbium Doped ions
Turn, and then generate excited radiation light, by control Resonant Intake System to increase intracavitary adjacent longitudinal mode spacing, single-frequency can be obtained
The oscillation of 976nm basic frequency laser and operating.The characteristics of using the central wavelength of fiber grating by temperature, stress influence, passes through
The temperature of narrowband polarization-maintaining fiber grating 10 is adjusted in two thermoelectric cooler TEC12, changes narrowband polarization-maintaining fiber grating 10
Central wavelength makes the reflectance spectrum of itself and broadband fiber gratings 3 generate mismatch state；And further pass through the first thermoelectric cooling
Device TEC4 carries out temperature adjusting to broadband fiber gratings 3, changes its wave-length coverage and drift bearing, so that narrowband polarization-maintaining light
There is unmatched degree aggravation with the reflectance spectrum of broadband fiber gratings 3 in the central wavelength of fine grating 10, is finally unable to starting of oscillation and swashs
Penetrate basic frequency laser.The characteristics of volume of PZT piezoelectric ceramics 11 is by load effect of signals is recycled, by loading signal to PZT
Piezoelectric ceramics 11 changes the length for the narrowband polarization-maintaining fiber grating 10 being tightly secured in above PZT piezoelectric ceramics 11, to change
Its central wavelength, so that the central wavelength of narrowband polarization-maintaining fiber grating 10 occurs accordingly with the reflectance spectrum of broadband fiber gratings 3
Matching status, the laser reflected from broadband fiber gratings 3 can reflect at narrowband polarization-maintaining fiber grating 10, form fundamental frequency
Laser generation.Due to load a cycle signal on PZT piezoelectric ceramics 11 can the intracavitary loss of modulating resonance, thus
Available tune Q pure-tone pulse basic frequency laser output.Then humorous under high power density operating by the way that nonlinear crystal 6 to be placed in
It shakes intracavitary, fundamental frequency pulse laser is existed simultaneously in resonant cavity, nonlinear second harmonic generates process, single-frequency under the action of hysteroscope
Basic frequency laser and single-frequency blue light multipass Crystallization resonant check frequency multiplication, can obtain compact-sized, high conversion efficiency
488nm single-frequency blue light pulse laser output.Based on aforesaid way, may finally realize high-power, narrow based on fiber form
Line width single-frequency blue light pulse laser, and apparatus structure is very compact, simple and easy.
The above is only a specific embodiment of the present invention, but the design concept of the present invention is not limited to this, all to utilize this
Design makes a non-material change to the present invention, and should belong to and invades the scope of the present invention and behavior.
Claims (3)
1. a kind of large-power optical fiber base pure-tone pulse laser, including pumping source (1), it is characterised in that further include bundling device (2),
Broadband fiber gratings (3), the first thermoelectric cooler TEC(4), it is input collimator (5), nonlinear crystal (6), temperature controlling stove (7), defeated
Collimator (8), high-gain Yb dosed optical fiber (9), narrowband polarization-maintaining fiber grating (10), PZT piezoelectric ceramics (11), the second thermoelectricity system out
Cooler TEC(12), dichroic mirror (13)；The wherein working media by high-gain Yb dosed optical fiber (9) as laser, by broadband optical fiber light
Grid (3) and narrowband polarization-maintaining fiber grating (10) form the front and back hysteroscope of short F-P resonant cavity;The wherein tail optical fiber of pumping source (1) and conjunction
The pumping input terminal of beam device (2) connects, and the signal output end of bundling device (2) is connect with broadband fiber gratings (3), broadband optical fiber light
Grid (3) are connect through input collimator (5) with one end of nonlinear crystal (6), and the other end of nonlinear crystal (6) is collimated through output
Device (8) is connect with one end of high-gain Yb dosed optical fiber (9), the other end and narrowband polarization maintaining optical fibre light of high-gain Yb dosed optical fiber (9)
One end of grid (10) connects, and the other end of narrowband polarization-maintaining fiber grating (10) is connect with dichroic mirror (13)；Wherein the first thermoelectricity system
Cooler TEC(4), the second thermoelectric cooler TEC(12) be separately fixed at broadband fiber gratings (3) and narrowband polarization-maintaining fiber grating
(10) on, pass through the first thermoelectric cooler TEC(4) temperature adjusting is carried out to broadband fiber gratings 3, change its wave-length coverage and drift
Direction is moved, so that the central wavelength of narrowband polarization-maintaining fiber grating (10) occurs not with the reflectance spectrum of broadband fiber gratings (3)
Matched degree aggravation, is finally unable to starting of oscillation lasing basic frequency laser；Pass through the second thermoelectric cooler TEC(12) to narrowband polarization-maintaining light
The temperature of fine grating (10) is adjusted, and changes the central wavelength of narrowband polarization-maintaining fiber grating (10), makes itself and broadband optical fiber light
The reflectance spectrum of grid (3) generates mismatch state；Nonlinear crystal (6) is fixed on temperature controlling stove (7), and PZT piezoelectric ceramics (11) is solid
It is scheduled on narrowband polarization-maintaining fiber grating (10), the PZT piezoelectric ceramics (11) is fixed on narrowband polarization-maintaining fiber grating (10)
Side applies biasing voltage signal realization to PZT piezoelectric ceramics (11) and stretches, then in narrowband polarization-maintaining fiber grating (10)
Cardiac wave length is adjusted and controls；The input collimator (5) and output collimator (8) is ultrashort focal length, focal length 0.5-
5cm；The nonlinear crystal (6) is periodically poled lithium niobate (LiNbO3) or lithium tantalate (LiTaO3) crystal, shape is block
Body or waveguide type structure are 0.5-5cm using length；The high-gain Yb dosed optical fiber (9) is double-clad structure, in 960-
Gain coefficient at 980nm wavelength is greater than 1dB/cm, the use of length is 0.2-20cm；The dichroic mirror (13) is to pulsed blue
Wavelength is high thoroughly, and transmissivity is greater than 90%, is all high anti-, reflection to basic frequency laser 960-980nm and 900 ~ 930nm of pump light wave band
Rate is greater than 90%.
2. large-power optical fiber base pure-tone pulse laser as described in claim 1, it is characterised in that: the pumping source (1) is
The semiconductor laser of wavelength 900-930nm, optical fiber laser perhaps other solid-state lasers and be single transverse mode or more transverse modes
Output；The broadband fiber gratings (3) are high to pump light 900-930nm wavelength thoroughly, transmissivity 70%-99.9%；Broadband light
Fine grating (3) is both high anti-to 960 ~ 980nm basic frequency laser and blue light wavelength, reflectivity 70-99.9%, 3dB reflection
Spectrum width is 0.01-20nm.
3. large-power optical fiber base pure-tone pulse laser as claimed in claim 2, it is characterised in that: the narrowband polarization-maintaining light
Fine grating (10) both partially reflects basic frequency laser 960-980nm and blue light wavelength, the reflection of the two central wavelength
Rate is 10-80%, and it is 0.01-1nm that 3dB, which reflects spectrum width,.
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| CN109193314A (en) * | 2018-09-21 | 2019-01-11 | 华南理工大学 | A kind of adjustable narrow linewidth photo-generated microwave source based on Polarization Control |
| CN111934179A (en) * | 2020-09-03 | 2020-11-13 | 中国人民解放军国防科技大学 | Ytterbium-doped fiber laser using specific wavelength band pump |
| CN115755269A (en) * | 2023-01-09 | 2023-03-07 | 武汉中科锐择光电科技有限公司 | Optical frequency comb generation device and method based on precise optical fiber micro-nano structure |
| CN117712817B (en) * | 2023-12-14 | 2024-05-31 | 上海频准激光科技有限公司 | Single-frequency laser system and laser interferometer comprising same |
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| CN104242039A (en) * | 2014-09-23 | 2014-12-24 | 合肥恒锐光电科技有限公司 | Small-size frequency doubling green light optical fiber laser |
| CN104466636A (en) * | 2014-11-30 | 2015-03-25 | 华南理工大学 | Single-frequency Q-switched pulsed fiber laser |
| CN105356216A (en) * | 2015-11-16 | 2016-02-24 | 华南理工大学 | All-fiber narrow-linewidth single frequency green laser |
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| CN106229804A (en) | 2016-12-14 |
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