CN106356710A - Full-optical-fiber single-frequency blue laser device - Google Patents
Full-optical-fiber single-frequency blue laser device Download PDFInfo
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- CN106356710A CN106356710A CN201610905560.0A CN201610905560A CN106356710A CN 106356710 A CN106356710 A CN 106356710A CN 201610905560 A CN201610905560 A CN 201610905560A CN 106356710 A CN106356710 A CN 106356710A
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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 full-optical-fiber single-frequency blue laser device which comprises a linear polarization single-frequency laser seed source, a thulium-doped optical fiber amplifier, a first polarization controller, a first tail-fiber-containing coupling waveguide crystal, a first temperature control furnace, a first filter, a second polarization controller, a second tail-fiber-containing coupling waveguide crystal, a second temperature control furnace and a second filter. The full-optical-fiber single-frequency blue laser device consists of three parts, wherein the first part is a 2.0mu m-waveband single-frequency fundamental frequency light device, and the thulium-doped optical fiber amplifier amplifies the power of the linear polarization single-frequency laser seed source to relatively high output power; the second part is a first-stage frequency doubling device for doubling 2.0mu m-waveband fundamental frequency light to a 1.0mu m-waveband through a nonlinear crystal; and the third part is a second-stage frequency doubling device for continuously doubling the 1.0mu m-waveband laser subjected to first-stage frequency doubling to blue light waveband, and finally, the filters filter out the residual fundamental frequency light, so that single-frequency blue laser outputting with high light beam quality is realized. The full-optical-fiber single-frequency blue laser device is compact and simple in structure and high in stability.
Description
Technical field
The present invention relates to laser instrument, especially a kind of single-frequency blue laser based on frequency multiplication of outer-cavity, all-fiber structure.
Background technology
All -fiber single-frequency laser operates at single longitudinal mode state, and not only output beam quality is good for it, compact conformation, be easy to
Integrated, also have the advantages that output spectrum line width and noise are low, thus development is very rapid.In current short-wave band (< 0.8
M), in the case that shortage gain media directly can produce laser, second_harmonic generation (shg) frequency multiplication is that acquisition short-wave band is (visible
Light) LASER Light Source effective means.The single-frequency blue laser particularly obtaining through frequency multiplication mode, can be used as laser storage, coloured silk
Color shows, the perfect light source of biological and medical diagnosiss, subsurface communication etc..
Current research institution in the world produces key component 940nm or the 980nm of blue laser for frequency multiplication of outer-cavity
Fundamental frequency light, mainly uses the mode such as rare earth ion doped crystalline material, semi-conducting material laser instrument, air cladding layer special fiber,
It haves such problems as that output is relatively low, spectral line width is wider, mode quality is poor, due to frequency-doubling conversion efficiency and fundamental frequency light work(
Rate density, breadth of spectrum line, spectral luminance factor, crystal parameter etc. are closely related, thus result in corresponding frequency-doubling conversion efficiency harmonic
Power is relatively low.Frequency multiplication of outer-cavity mode needs higher fundamental frequency luminous power, because absorption cross-section near 978nm for the ytterbium ion is short
Wave band increases substantially and re-absorption is serious, the power amplification for this wave band more difficult although using larger core diameter/bag
The Yb dosed optical fiber of layer diameter proportion can obtain high power 978nm light source, but the beam quality of output laser is very poor, and spectrum is
Wide spectrum.And these laser aids typically adopt spatial coupling, whole system structure is more complicated, volume is larger, stable
Property is poor.As zou et al. obtains power 1.32w's using the nd:yag solid state laser pumping Yb dosed optical fiber of wavelength 946nm
980nm laser exports, and then by way of bibo crystal frequency multiplication of outer-cavity, obtains power 15mw, wavelength 490nm blue laser output
[appl. phys. b, 2009, 95].
Patents have: (1) 2008 year, Northwest University applied for high-power blue-light fiber laser patent [publication number:
Cn 100372197c], resonator cavity is become by active cavity by two directional pump intracavity frequency doubling mode, finally realizes high-power indigo plant
Light output, but the blue light of this structure output not single-frequency form, and beam quality is poor.(2) 2013 years, Shandong sea richness photon
Science and Technology Co., Ltd. has applied for the patent [publication number: cn 103545702a] of pure-tone pulse blue light source, using piezoelectricity unit
The polarization direction that part periodically presses gain fibre modulation 978nm fundamental frequency light carries out adjusting q, and nonlinear crystal is placed in resonator cavity
Outward it is achieved that pure-tone pulse blue laser exports, but its required blue laser does not have all-fiber characteristic, and ties
Structure is more complicated.
Content of the invention
The invention aims to overcoming the deficiencies in the prior art, one kind is provided to be based on two-stage frequency multiplication of outer-cavity, all -fiber
Change the single-frequency blue laser of structure.Technical problem to be solved is: overcomes existing blue laser output linewidth wider, defeated
Go out the shortcomings of power is relatively low, structure is more complicated.
One of for reaching above-mentioned purpose, the present invention at least adopts the following technical scheme that.
A kind of all -fiber single-frequency blue laser, puts including 2.0 m wave band linear polarization single-frequency laser seed sources, thulium doped fiber
Big device, the first Polarization Controller, first band pigtail coupling waveguide type crystal, the first temperature controlling stove, the first wave filter, the second polarization control
Device processed, the second band tail optical fiber coupled waveguide type crystal, the second temperature controlling stove, the second wave filter.Structural relation between each part is: institute
The output tail optical fiber of the single-frequency laser seed source stated is connected with the input of thulium doped fiber amplifier, the output of thulium doped fiber amplifier
End is connected with one end of the first Polarization Controller, the other end of the first Polarization Controller and first band pigtail coupling waveguide type crystal
Input be connected, the outfan of first band pigtail coupling waveguide type crystal is connected with the input of the first wave filter, first filter
The outfan of ripple device is connected with one end of the second Polarization Controller, and the other end of the second Polarization Controller and second carries pigtail coupling
The input of waveguide type crystal is connected, the input phase of the second outfan with tail optical fiber coupled waveguide type crystal and the second wave filter
Even, the outfan of the second wave filter is as the output port of single-frequency blue laser.Wherein first band pigtail coupling waveguide type crystal
It is respectively placed in inside the first temperature controlling stove and the second temperature controlling stove with the second band tail optical fiber coupled waveguide type crystal.
Further, described 2.0 m wave band linear polarization single-frequency laser seed sources are based on the linear short bore configurations of dbr, its two ends
Carry out wavelength selection using constituting before and after's reflecting cavity mirror with bragg grating, middle is highly doped thulium ion germanate glass
Optical fiber, is 0.5 ~ 5cm using length；Single-frequency laser seed source be linear polarization single longitudinal mode output, output wavelength scope be 1850 ~
2000nm, output state is continuous or pulse.
Further, described thulium doped fiber amplifier adopt multimode cladding pumping structure, gain fibre be highly doped thulium from
Sub- germanate glass optical fiber or the thulium-doped silica fib of commercialization, pumping source number, pump power, pumping wavelength and gain fibre
Length can determine according to required fundamental frequency light watt level during concrete frequency multiplication, and pump mode can be forward pumping, backward pump
Pu or two directional pump.
Further, described first Polarization Controller include 3 become set angles arrangement optical fiber squeezers and one section be subject to
Control optical fiber.By adjusting Polarization Controller thus realizing the control to polarization state in fiber-optic transfer, and pass through accurate adjustment first
The control temperature of temperature controlling stove, makes first band pigtail coupling waveguide type crystal reach the quasi-phase matched condition needed for frequency multiplication, realizes
Efficient output from the first order double-frequency laser of 2.0 m to 1.0 m wave band.
Further, described first band pigtail coupling waveguide type crystal and the second band tail optical fiber coupled waveguide type crystal are by front
Optical fiber collimator, nonlinear crystal, the encapsulation of rear optical fiber collimator form, and realize all-fiber structure.Wherein frequency-doubling crystal is week
Phase polarized crystal Lithium metaniobate (ppln), lithium tantalate (pplt), or birefringece crystal three Lithium biborate (lbo), barium metaborate
(bbo), bismuth borate (bibo) etc..
Further, described first wave filter can be completely through absorbance is more than 99.9% to 1.0 m wave band of laser；Right
2.0 m wave band of laser are fully reflective, and reflectance is more than 99.9%.For filtering 2.0 m wave bands of residual after first order frequency multiplication
Fundamental frequency light.
Further, described second Polarization Controller is same includes 3 optical fiber squeezers and becoming set angle arrangement
Section controlled fiber.Its adjustment be 1.0 m wave band of laser after first order frequency multiplication polarization state, be allowed to and the second band tail optical fiber coupled wave
The polarization state coupling that conductivity type crystal is supported；And by the control temperature of accurate adjustment second temperature controlling stove, make the second band tail optical fiber coupling
Close waveguide type crystal and reach quasi-phase matched condition needed for frequency multiplication, realize 1.0 m wave band fundamental frequency light to the second of blue laser
Level frequency multiplication output.
Further, described second wave filter can be completely through absorbance is more than 99.9% to blue wave band of laser；Right
1.0 m wave band of laser are fully reflective, and reflectance is more than 99.9%；Its 1.0 m wave band base remaining after being used for filtering second level frequency multiplication
Frequency light, and its outfan plating anti-reflection film or grind to form inclined-plane as the output port of single-frequency blue light.
The present invention utilizes two-stage frequency multiplication of outer-cavity structure, by 2.0 m wave band high power single-frequency optical-fiber lasers of amplification to non-
Linear crystal carries out frequency conversion.Under thulium doped fiber amplifier effect, by 2.0 m wave band linear polarization single-frequency laser seed source work(
Rate is amplified to higher output power, and as first order fundamental frequency light source；Process is produced based on nonlinear second harmonic, by 2.0 m
Wave band fundamental frequency light passes through nonlinear crystal frequency multiplication to 1.0 m wave bands；Again 1.0 m wave band of laser after frequency multiplication are continued through non-thread
Property crystal double frequency is to blue wave band.This laser instrument avoids and adopts bulk optics components and parts in existing blue laser it is achieved that whole
The all-fiber of individual structure；And due to polarizing single frequency optical fiber laser as fundamental frequency light source using 2.0 m wave band high power line,
While ensureing higher fundamental frequency luminous power and narrow linewidth, it is possible to achieve good single transverse mode operating, therefore can obtain full light
Fibrillation, the single-frequency blue laser output of high light beam quality.
Compared with prior art, the solution have the advantages that: produced using two-stage outer-cavity structure and nonlinear second harmonic
Raw process, carries out frequency conversion using 2.0 m wave band high power single-frequency optical-fiber lasers to nonlinear crystal.Based on 2.0 m wave bands
Linear polarization single-frequency laser seed source, obtains the first order high power base needed for frequency multiplication by thulium doped fiber amplifier after being amplified
Frequency light source；Again 2.0 m wave band fundamental frequency light are passed through nonlinear crystal frequency multiplication to 1.0 m wave bands, obtain the second level needed for frequency multiplication
Fundamental frequency light source；Finally 1.0 m wave band of laser are continued through nonlinear crystal frequency multiplication to blue wave band, obtained by two-stage frequency multiplication
Obtain the single-frequency blue laser output of high light beam quality.Due to adopting all-fiber structure, whole system is extremely compact, simply easily
OK, and working stability.
Brief description
Fig. 1 is the dbr short bore configurations schematic diagram of 2.0 m wave band linear polarization single-frequency laser seed sources in example.
Fig. 2 is to carry tail optical fiber coupled waveguide type crystal packaging structure schematic diagram described in example.
Fig. 3 is all -fiber single-frequency blue laser structure schematic diagram in example.
In figure: the high anti-fiber grating in 201 broadbands, 202 highly doped thulium ion germanate glass optical fibers, 203 arrowbands
Low anti-polarization-maintaining fiber grating；Optical fiber collimator before 301,302 nonlinear crystals, optical fiber collimator after 303；11—2.0µ
M wave band linear polarization single-frequency laser seed source, 12 thulium doped fiber amplifiers, 21 first Polarization Controllers, 22 first magnetic tape trailers
Fine coupled wave conductivity type crystal, 23 first temperature controlling stoves, 31 first wave filter, 32 second Polarization Controllers, 33 second bands
Pigtail coupling waveguide type crystal, 34 second temperature controlling stoves, 41 second wave filter.
Specific embodiment
The present invention is described in further detail by specific embodiment below in conjunction with accompanying drawing, in order to be more clearly understood that
The present invention, but the enforcement volume of present invention protection not limited to this, if it is noted that have below not especially the process of detailed description or
Person's technological parameter, is all that those skilled in the art can refer to prior art realization.
As shown in figure 1, the dbr short bore configurations of this example 2.0 m wave band linear polarization single-frequency laser seed source, its two ends is general
With the high anti-fiber grating 201 in broadband, before and after the low anti-polarization-maintaining fiber grating 203 in arrowband is constituted, reflecting cavity mirror carries out wavelength selection, in
Between be highly doped thulium ion germanate glass optical fiber 202, using length be 0.5 ~ 5cm.In this example, described 2.0 m wave band lines
Polarization single-frequency laser seed source form before and after's hysteroscope by the low anti-polarization-maintaining fiber grating in a pair of arrowband and broadband high anti-fiber grating, logical
Cross welding or the mode of docking is connected to the two of the highly doped thulium ion germanate glass optical fiber that a segment length is 0.5 ~ 5cm
End, collectively forms single-frequency laser resonator cavity, the output wavelength scope of single-frequency laser seed source is 1850 ~ 2000nm.
As shown in Fig. 2 the band tail optical fiber coupled waveguide type crystal packaging structure that this example is used, by front optical fiber collimator
301st, nonlinear crystal 302, rear optical fiber collimator 303 encapsulation form, and then realize the all-fiber transmission structure of whole system.
Wherein nonlinear crystal 302 can be periodical poled crystal Lithium metaniobate (ppln), lithium tantalate (pplt), or birefringece crystal three
Lithium biborate (lbo), barium metaborate (bbo), bismuth borate (bibo) etc..
As shown in figure 3, a kind of all -fiber single-frequency blue laser of this example, mainly include three parts, respectively singly
Frequency fundamental frequency electro-optical device part 1, is made up of 2.0 m wave band linear polarization single-frequency laser seed sources 11 and thulium doped fiber amplifier 12；The
One-level frequency doubling device part 2, by the first Polarization Controller 21, first band pigtail coupling waveguide type crystal 22, the first temperature controlling stove 23
(can use small-sized temperature controlled stove) composition；Second level frequency doubling device part 3, by the first wave filter 31, the second Polarization Controller 32, second
Band tail optical fiber coupled waveguide type crystal 33, the second temperature controlling stove 34(can use small-sized temperature controlled stove) composition.Structural relation between each part
It is: the output tail optical fiber of 2.0 described m wave band linear polarization single-frequency laser seed sources 11 and the input of thulium doped fiber amplifier 12
It is connected, the outfan of thulium doped fiber amplifier 12 is connected with one end of the first Polarization Controller 21, the first Polarization Controller 21
The other end is connected with the input of first band pigtail coupling waveguide type crystal 22, first band pigtail coupling waveguide type crystal 22 defeated
Go out end to be connected with the input of the first wave filter 31, one end phase of the outfan of the first wave filter 31 and the second Polarization Controller 32
Even, the other end of the second Polarization Controller 32 is connected with the second input with tail optical fiber coupled waveguide type crystal 33, the second magnetic tape trailer
The outfan of fine coupled wave conductivity type crystal 33 is connected with the input of the second wave filter 41, the outfan conduct of the second wave filter 41
The output port of single-frequency blue laser.Wherein first band pigtail coupling waveguide type crystal 22 and the second band tail optical fiber coupled waveguide type are brilliant
Body 33 is respectively placed in inside the first temperature controlling stove 23 and the second temperature controlling stove 34.First Polarization Controller 21 and the second Polarization Controller 32
All include three optical fiber squeezers becoming set angle (as triangle) to arrange and one section of controlled fiber, and controlled fiber is to protect partially
Single-mode fiber.
Wherein 2.0 m wave band linear polarization single-frequency laser seed sources 11 adopt dbr short bore configurations, using length in this example
The highly doped thulium ion germanate glass optical fiber 202 of 1.5cm is as gain media, 3db bandwidth 0.4nm, the width of reflectance 99.9%
With fiber grating 201 and 3db bandwidth 0.06nm, reflectance 70% arrowband polarization-maintaining fiber grating 203 as in front and back's hysteroscope, center
Wavelength is 1940nm.And carry out backward pump, single-frequency laser seed using the 793nm single mode semiconductor laser of power 200mw
The 1940nm single-frequency laser output that power 20mw, polarization extinction ratio are more than 26db is finally realized in source.
In this example, thulium doped fiber amplifier 12 carries out power amplification using cladding pumping mode to seed source, in this example
Thulium doped fiber amplifier 12 adopts 793nm multimode semiconductor laser using commercial thulium-doped silica fib, pump light source, utilizes
Two-stage structure for amplifying, by seed source power amplification to 30w.1940nm fundamental frequency light after wherein first Polarization Controller 21 adjustment amplification
Polarization state, the polarization state being allowed to be supported with first band pigtail coupling waveguide type crystal 22 mated, wherein first band tail optical fiber coupling
Closing waveguide type crystal 22 is periodical poled crystal Lithium metaniobate (ppln).Wherein first temperature controlling stove 23 passes through the non-linear crystalline substance of precise control
The temperature of body, realizes quasi-phase matched, obtains 970nm single-frequency laser after first order frequency multiplication.Wherein first wave filter 31 is filtered
Except the 1940nm fundamental frequency light of residual after first order frequency multiplication, realize high-quality 970nm single-frequency linearly polarized laser output, and make
Fundamental frequency light source for next stage frequency multiplication.Wherein second Polarization Controller 32 adjust frequency multiplication after 970nm laser polarization state, be allowed to
Second polarization state supported with tail optical fiber coupled waveguide type crystal 33 is mated, the wherein second band tail optical fiber coupled waveguide type crystal 33
It is periodical poled crystal Lithium metaniobate (ppln).Wherein second temperature controlling stove 34 passes through the temperature of precise control nonlinear crystal, realizes
Quasi-phase matched, thus obtain the single-frequency blue light of 485nm after the frequency multiplication of the second level.Wherein second wave filter 41 filters through the second level
The 970nm laser of residual after frequency multiplication, realizes the 485nm single-frequency blue laser output of all optical fibre structure.
The single-frequency blue laser output of the present embodiment up to watt level more than, device is compact, structure is simple, light beam matter
Measure, can be used as preferable blue laser light source.
Claims (10)
1. a kind of all -fiber single-frequency blue laser is it is characterised in that include 2.0 m wave band linear polarization single-frequency laser seed sources
(11), thulium doped fiber amplifier (12), the first Polarization Controller (21), first band pigtail coupling waveguide type crystal (22), first
Temperature controlling stove (23), the first wave filter (31), the second Polarization Controller (32), the second band tail optical fiber coupled waveguide type crystal (33), the
Two temperature controlling stoves (34) and the second wave filter (41)；The output tail optical fiber of described single-frequency laser seed source is defeated with thulium doped fiber amplifier
Enter end be connected, the outfan of thulium doped fiber amplifier is connected with one end of the first Polarization Controller, the first Polarization Controller another
One end is connected with the input of first band pigtail coupling waveguide type crystal, the outfan of first band pigtail coupling waveguide type crystal with
The input of the first wave filter is connected, and the outfan of the first wave filter is connected with one end of the second Polarization Controller, the second polarization
The other end of controller is connected with the second input with tail optical fiber coupled waveguide type crystal, the second band tail optical fiber coupled waveguide type crystal
Outfan be connected with the input of the second wave filter, the outfan of the second wave filter is as the outfan of single-frequency blue laser
Mouthful；First band pigtail coupling waveguide type crystal and the second band tail optical fiber coupled waveguide type crystal are respectively placed in the first temperature controlling stove and second
In temperature controlling stove；Described be connected all using optical fiber splicer carry out welding be connected, and optical device used be guarantor inclined type optical device.
2. all -fiber single-frequency blue laser as claimed in claim 1 it is characterised in that: 2.0 described m wave band linear polarizations
Single-frequency laser seed source (11) is based on the linear short bore configurations of dbr, and its two ends adopts with bragg grating (201,203) structure
Before and after one-tenth, reflecting cavity mirror carries out wavelength selection, and middle is highly doped thulium ion germanate glass optical fiber (202), using length is
0.5~5cm；Single-frequency laser seed source (11) exports for linear polarization single longitudinal mode, and output wavelength scope is 1850 ~ 2000nm, exports shape
State is continuous or pulse.
3. all -fiber single-frequency blue laser as claimed in claim 1 it is characterised in that: described thulium doped fiber amplifier
(12) single-frequency laser seed source is carried out with power amplification, the gain fibre of thulium doped fiber amplifier is highly doped thulium ion germanate
Glass optical fiber or the thulium-doped silica fib of commercialization, pumping source number, pump power, pumping wavelength and gain fibre length according to
During concrete frequency multiplication, required fundamental frequency light watt level selects to determine.
4. all -fiber single-frequency blue laser as claimed in claim 1 it is characterised in that: the first described Polarization Controller
(21) with the second Polarization Controller (32) all includes three optical fiber squeezers becoming set angle arrangement and one section of controlled fiber, and
Controlled fiber is polarization-maintaining single-mode fiber.
5. all -fiber single-frequency blue laser as claimed in claim 4 it is characterised in that: the first described Polarization Controller
(21) it is used for being adjusted into the polarization state of 2.0 m wave band fundamental frequency light in first band pigtail coupling waveguide type crystal (22), make fundamental frequency
The polarization state that the polarization state of light and nonlinear crystal are supported matches, thus producing the frequency doubled light of 1.0 m wave bands, and under conduct
The fundamental frequency light source of one-level frequency multiplication.
6. all -fiber single-frequency blue laser as claimed in claim 1 it is characterised in that: described first band pigtail coupling ripple
Conductivity type crystal (22) and the second band tail optical fiber coupled waveguide type crystal (33) are by front optical fiber collimator (301), nonlinear crystal
(302), rear optical fiber collimator (303) encapsulation forms, and then realizes the all-fiber transmission structure of whole laser instrument, wherein non-thread
Property crystal (302) is periodical poled crystal Lithium metaniobate (ppln), lithium tantalate (pplt), or birefringece crystal three Lithium biborate
(lbo), barium metaborate (bbo), bismuth borate (bibo).
7. all -fiber single-frequency blue laser as claimed in claim 1 it is characterised in that: described the first wave filter (31) is right
1.0 m wave band of laser can be completely through absorbance is more than 99.9%；Fully reflective to 2.0 m wave band of laser, reflectance is more than
99.9%, the first wave filter is used for filtering 2.0 m wave band fundamental frequency light of residual after first order frequency multiplication.
8. all -fiber single-frequency blue laser as claimed in claim 4 it is characterised in that: the second described Polarization Controller
(32) it is used for being adjusted into the polarization state of 1.0 m wave band fundamental frequency light in the second band tail optical fiber coupled waveguide type crystal (33), make fundamental frequency
The polarization state that the polarization state of light and crystal waveguide are supported matches, thus producing the single-frequency blue laser of linear polarization.
9. all -fiber single-frequency blue laser as claimed in claim 1 it is characterised in that: described the second wave filter (41) is right
Blue wave band of laser can be completely through absorbance is more than 99.9%；Fully reflective to 1.0 m wave band of laser, reflectance is more than
99.9%；The 1.0 m wave band fundamental frequency light that second wave filter remains after being used for filtering second level frequency multiplication.
10. all -fiber single-frequency blue laser as claimed in claim 1 it is characterised in that: described the second wave filter (41)
Outfan as laser system export tail optical fiber, ground be polished to inclined-plane or plating anti-reflection film to prevent end face reflection.
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| CN110908214A (en) * | 2019-11-01 | 2020-03-24 | 华南理工大学 | Full optical fiber bright compressed state light field generating device |
| CN110908214B (en) * | 2019-11-01 | 2021-04-06 | 华南理工大学 | Full optical fiber bright compressed state light field generating device |
| CN112993735A (en) * | 2019-12-14 | 2021-06-18 | 中国科学院大连化学物理研究所 | High-efficiency blue laser |
| CN111711061A (en) * | 2020-06-29 | 2020-09-25 | 华南理工大学 | Dual-wavelength all-fiber laser |
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Application publication date: 20170125 |