CN103259172A - Radio frequency modulation tunable all-fiber laser based on fiber loop mirror - Google Patents
Radio frequency modulation tunable all-fiber laser based on fiber loop mirror Download PDFInfo
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- CN103259172A CN103259172A CN2013101416626A CN201310141662A CN103259172A CN 103259172 A CN103259172 A CN 103259172A CN 2013101416626 A CN2013101416626 A CN 2013101416626A CN 201310141662 A CN201310141662 A CN 201310141662A CN 103259172 A CN103259172 A CN 103259172A
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Abstract
The invention discloses a radio frequency modulation tunable all-fiber laser based on a fiber loop mirror. The radio frequency modulation tunable all-fiber laser based on the fiber loop mirror is characterized in that one arm of the fiber loop mirror, a dual-cladding non-doped fiber, a dual-cladding doped fiber, a signal optical channel of a wavelength division multiplexer and an output tail fiber are sequentially connected in a welding mode end-to-end. A pumping source is connected with a pumping source optical channel of the wavelength division multiplexer in a welding mode. A fiber fixing traction support comprises a left lobe and a right lobe. The dual-cladding non-doped fiber is wound in a groove outside the fiber fixing traction support and tightened. A triangular prism support is arranged on piezoelectric ceramic, and cushion blocks are arranged at the bottom of the piezoelectric ceramic. The piezoelectric ceramic is connected with a radio frequency power source. According to radio frequency modulation tunable all-fiber laser based on the fiber loop mirror, by the adoption of the tuned radio frequency mode, ultrasonic vibration is utilized to form a long period fiber grating with an adjustable period, wavelength tuning of the fiber laser is achieved, a full-fiber structure without discrete component is adopted in the fiber laser, and no inserting loss is generated, so that optical quality is good, output power is high, the structure is compact, performance is stable and reliable, and continuous tuning in a wide range can be achieved.
Description
Technical field
The invention belongs to laser technology field, be specifically related to a kind of fiber laser, particularly a kind of rf modulations tunable whole-optical fibre laser based on fiber loop mirror.
Background technology
Fiber laser is little with its volume, advantages such as efficient is high, good stability, good beam quality, develops very rapid.At present in fiber laser, common adjustable laser technology mainly based on the resonance of rotating grating, composite ring, regulate chamber internal standard tool angle, utilize acousto-optic filter, electricity to transfer technology such as liquid crystal etalon, fiber grating tuning, fiber annular, sampled-grating and Polarization Control, adopt non-all optical fibre structure, it is low that the grating pair that uses is inconvenient to regulate efficient, perhaps adjustable range is narrow, and perhaps power output is too small.
Summary of the invention
At existing problem in the at present existing tunable fiber laser, the present invention discloses a kind of rf modulations tunable whole-optical fibre laser based on fiber loop mirror, this laser inserts very little, the one end adopts fiber loop mirror as the wide range completely reflecting mirror, the other end adopts 4% Fei Nier reflection of fiber cut end face as outgoing mirror, in fiber laser, insert the filter of the rf modulations of an all optical fibre structure, when the gain spectral of the absorption spectra of filter and Active Optical Fiber takes place when overlapping, the absorption spectra of filter just forms the gain spectral modulating action to Active Optical Fiber, its result is moved the gain spectral center gain wavelength after the modulation, under the effect of wide range speculum, the laser center wavelength that excites will become with the centre wavelength of gain spectral, realizes wavelength tuning.
To achieve these goals, the present invention adopts following technical scheme to be solved:
A kind of rf modulations tunable whole-optical fibre laser based on fiber loop mirror, comprise fiber loop mirror, optical fiber is the tractive support fixedly, the triangular prism support, piezoelectric ceramic, cushion block, radio-frequency power supply, the non-doped fiber of double clad, the double clad doped fiber, wavelength division multiplexer, pumping source and output tail optical fiber, wherein, a wherein arm of described fiber loop mirror, the non-doped fiber of double clad, the double clad doped fiber, the flashlight passage of wavelength division multiplexer and the welding successively that joins end to end of output tail optical fiber, another arm sling sky of fiber loop mirror need not, the pump light passage welding of pumping source and wavelength division multiplexer; Described optical fiber fixedly tractive support comprises left lobe and right lobe, connects by rigid cage between described left lobe and the right lobe; Left side lobe, right lobe are flat cylinder in the outer arc, carve a plurality of parallel grooves on left lobe, the right lobe outer arc; Fixedly in the groove of tractive support outside and tension, triangular prism props up and is placed on the piezoelectric ceramic the non-doped fiber of double clad around optical fiber, and cushion block is established in the piezoelectric ceramic bottom makes triangular prism prop up the non-doped fiber of rib contact double clad of top of the trellis; Described piezoelectric ceramic connects radio-frequency power supply.
The present invention also comprises following other technologies feature:
Described piezoelectric ceramic feeds the vibration that radio-frequency power supply causes the non-doped fiber of double clad, make the non-doped fiber fiber core refractive index of double clad generating period change and form long period fiber grating, the absorption spectra of generation centered by a certain wavelength, when the gain spectral of this absorption spectra and double clad doped fiber overlapping, the output frequency of radio-frequency power supply changes makes the movement of long-period gratings absorption spectra, thereby makes gain spectral centre wavelength move; The output wavelength of described laser and gain spectral centre wavelength match, thereby the adjustment of the output frequency by regulating radio frequency realizes the output wavelength that needs.
Distance between described left lobe and the right lobe is 8cm～30cm.
Described left lobe, right lobe are semicolumn, semiellipse post or rectangular band semicolumn.
Adjacent separation is 2mm～5mm on described left lobe, the right lobe, and groove depth is the non-doped fiber surrounding layer of double clad radius.
Described left lobe, right lobe top are equipped with press strip.
The drift angle of described triangular prism support is with 30 °～60 °.
The non-doped fiber of described double clad fixedly twines 4 circles, every circle spacing 2mm in tractive support outside at optical fiber.
It is 50:50 that described fiber loop mirror adopts coupling ratio.
The signal end of described wavelength division multiplexer is as the output tail optical fiber, and 4% Fei Nier of the cut surface of output tail optical fiber is reflected into outgoing mirror.
The present invention adopts the mode of tuned radio-frequency to form adjustable long period fiber grating of cycle with ultrasonic vibration and realizes the fiber laser wavelength tuning, fiber laser adopts all optical fibre structure of no discrete component, there is not the loss of insertion, have good beam quality, power output height, compact conformation, advantage stable and reliable for performance, this laser can be realized the continuous tuning of wide range simultaneously.
Description of drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is absorption spectrum test schematic diagram.
Fig. 3 is the fixing structural representation of tractive support of optical fiber.
Fig. 4 is the vertical view of Fig. 3.
Fig. 5 is the graph of a relation of the output wavelength of the radio frequency output frequency of radio-frequency power supply and laser of the present invention.
Below in conjunction with the drawings and specific embodiments the present invention is further explained.
Embodiment
Referring to Fig. 1, rf modulations tunable whole-optical fibre laser based on fiber loop mirror of the present invention, comprise fiber loop mirror 1, optical fiber is tractive support 2 fixedly, triangular prism support 3, piezoelectric ceramic 4, cushion block 5, radio-frequency power supply 6, the non-doped fiber 7 of double clad, double clad doped fiber 8, wavelength division multiplexer 9, pumping source 10 and output tail optical fiber 11, wherein, a wherein arm of fiber loop mirror 1, the non-doped fiber 7 of double clad, double clad doped fiber 8, the flashlight passage of wavelength division multiplexer 9 and the welding successively that joins end to end of output tail optical fiber 11, another arm sling sky of fiber loop mirror 1 need not, the pump light passage welding of pumping source 10 and wavelength division multiplexer (9); The full-optical-fiber laser of the present invention that above-mentioned parts are formed is divided into four parts from principle, is respectively resonant cavity, gain fibre, pumping part and tunable optic filter.
Resonant cavity is made up of fiber loop mirror 1 and outgoing mirror, fiber loop mirror 1 is the passive device that two output port fused fiber splices with 2 * 2 melting cone type broadband optical fiber coupler form together, coupling ratio is 50:50, and its effect is equivalent to completely reflecting mirror, requires its reflectivity more than or equal to 95%; Outgoing mirror adopts directly does cutting with the signal end of wavelength division multiplexer 9, also namely with 4% Fei Nier reflection of cutting end face as outgoing mirror.Incident light forms after by 2 * 2 melting cone type broadband optical fiber coupler beam splitting along clockwise direction and the two-beam of transmission counterclockwise, the latter has 90 ° bit phase delay than the former, always delaying time from the phase of light wave of clockwise direction contribution from the light wave of contribution counterclockwise in the output during again through the coupler beam splitting after light beam goes in ring a week is 180 ° of [Cao Xue, Li Xinying, et al. (2009). " based on the optimal design of the fiber laser of fiber loop mirror. "
Optical communication technique07.].Do not consider the supplementary load loss of coupler, if coupling ratio is α: (1-α), when α=0.5, destructive interference will appear in the light wave of two kinds of contributions in the output, according to conservation of energy principle, all importing luminous energy will be by the output of incident end, because identical its reflection characteristic of medium that the light of both direction is advanced shows as Wavelength-independent, so it can be used as a wide range completely reflecting mirror, serve as the end mirror of fiber laser.Because what end mirror and outgoing mirror all adopted is the wide range speculum, it does not have the frequency-selecting effect to laser output wavelength, and laser output wavelength only is subjected to the influence of net gain spectrum, namely equals the highest-gain wavelength of net gain spectrum yet.Laser output wavelength will be that the gain spectral centre wavelength of double clad doped fiber 8 is consistent with gain fibre like this.
Gain fibre is double clad doped fiber 8, it can adopt existing any to have double clad single-mode fiber than wide gain spectrum, have overlappingly as long as can satisfy the gain spectral of the absorption spectra of tunable optic filter of employing and gain fibre, just can realize tunable output.The present invention is adapted to the fiber laser of all doping, its main difference of fiber laser of the doubly clad optical fiber medium that mixes at difference is: double clad doped fiber 8 differences that fiber laser is selected, corresponding pumping source 10 will match, and the output frequency range of corresponding radio-frequency power supply 6 also needs to match.The output mode of consideration laser is selected corresponding core size and fibre core numerical aperture; According to the absorbing state of 8 pairs of pumpings of double clad doped fiber, definite size, covering absorptivity and the fiber lengths that need select the inner cladding of optical fiber for use.
Tunable optic filter is core component of the present invention, sees also Fig. 1-Fig. 4, and tunable optic filter comprises the fixedly non-doped fiber 7 of tractive support 2, triangular prism support 3, piezoelectric ceramic 4, cushion block 5, radio-frequency power supply 6 and double clad of optical fiber; Wherein, described optical fiber fixedly tractive support 2 comprises left lobe 21 and right lobe 22, connects by rigid cage 23 between described left lobe 21 and the right lobe 22 and both distances (being the length of rigid cage 23) are 8cm～30cm; Left side lobe 21, right lobe 22 are flat cylinder in the outer arc, specifically can be semicolumn, semiellipse post or rectangular band semicolumn, the column length of left side lobe 21, right lobe 22 is can satisfy fiber reel around being principle, all be carved with a plurality of parallel grooves 25 on left side lobe 21, right lobe 22 outer arcs, adjacent groove 25 spacings are 2mm～5mm, groove depth is the non-doped fiber 7 surrounding layer radiuses of double clad, guaranteeing namely that the non-doped fiber 7 of double clad is put in wherein can expose half, is provided be used to the press strip 24 that is fixed the non-doped fiber 7 of double clad at left lobe 21, right lobe 22 tops.
The filter, dielectric of tunable optic filter is that the physical dimension of the non-doped fiber 7 of double clad need be mated fully with gain fibre, is convenient to welding like this and loss is less.With the non-doped fiber 7 of double clad around optical fiber fixedly in the groove 25 of tractive support 2 outsides and tension, then triangular prism support 3 is placed on the piezoelectric ceramic 4, piezoelectric ceramic 4 bottom cushioning cushion blocks 5 make the non-doped fiber 7 of rib contact double clad at triangular prism support 3 tops, form the structure of the string and the support that are similar to seven-stringed plucked instrument in some ways similar to the zither.The drift angle of triangular prism support 3 is good with 30 °～60 °.Triangular prism support 3, piezoelectric ceramic 4, cushion block 5 constitute vibration and produce and the vibrational energy transmitting portions.Piezoelectric ceramic 4 connects radio-frequency power supply 6, when radio frequency output causes piezoelectric ceramic 4 vibrations, vibrational energy passes to the non-doped fiber 7 of double clad by triangular prism support 3, in this optical fiber, form periodic swinging, when the pattern in fibre core pattern and the inner cladding satisfies phase-matching condition, fibre core pattern and inner cladding pattern effects of coupling between will take place, its effect is equivalent to a long period fiber grating, its center absorption spectra is relevant with the grating cycle, and the frequency of grating cycle and radio frequency vibration, Oscillation Amplitude is relevant, when Oscillation Amplitude one timing, can change the absorption spectra of this long period fiber grating by the output frequency of regulating radio-frequency power supply 6, when the gain spectral of the absorption spectra of this long period fiber grating and gain fibre takes place when overlapping, just can change the centre wavelength that net gain is composed by the output frequency of regulating radio-frequency power supply 6, realize tunable output laser.
In the said structure of tunable optic filter, be wrapped in optical fiber fixedly the number of turns of the non-doped fiber 7 of double clad of tractive support 2 outsides be 1-8 circle, the number of turns is more many, the degree of depth of absorption spectra is more dark, generally according to the width number of turns suitable with the intensity selection of the gain spectral of gain media, get at Danone and effectively to be modulated to principle.
In this structure, the mode coupling effect is relevant with intensity and the fibre diameter of radio frequency vibration, vibrational energy is more many, coupling efficiency is more high, the more thin coupling effect of optical fiber is more obvious, particularly behind the surrounding layer that takes down the non-doped fiber 7 of double clad, coupling effect is obviously strengthened, trace it to its cause and be that surrounding layer is resin material, the fibre core and the inner cladding material that stay after it is removed are quartz glass, vibrating effect is obviously strengthened, and absorbs the degree of depth and also strengthens a lot, can reduce the requirement to radio-frequency power supply 6 power outputs like this.Can adopt hot soarfing to remove or the method for chemical corrosion with optical fiber fixedly the left lobe, the surrounding layer of optical fiber between the right lobe of tractive support 2 divest, obtain the coupling effect of stronger pattern and the bigger absorption degree of depth with it.
In this structure, absorbent core wavelength and rf frequency variable quantity are linear, and it satisfies
λ＝λ
0+kΔf
In the formula, λ is the absorbent core wavelength, and Δ f is the rf frequency variable quantity, λ
0Be the measuring basis wavelength, the corresponding absorbent core wavelength of Δ f=0 just, k is the slope that the frequent rate of absorbent core wavelength carried as side-arm changes, it is except outside the Pass having with fiber core and inner cladding structural parameters, also relevant with the mechanical characteristic of optical fiber, the k value is-0.1～-1nm/KHz, along with the increase of rf frequency, blue shift can take place in the absorbent core wavelength.
Pumping partly is used for laser works institute energy requirement is provided, and is made of pumping source 10 and wavelength division multiplexer 9.Pumping source 10 adopts the semiconductor laser of the fine output of magnetic tape trailer, and its output wavelength need satisfy the desired pumping wavelength of gain fibre, and the power output size that requires according to laser of the present invention is selected corresponding pump power then.Pump light is by pumping source 10 outputs, be coupled into the inner cladding of double clad doped fiber 8 through wavelength division multiplexer 9, and then be transported to continually the fibre core of double clad doped fiber 8 from this inner cladding, for the working-laser material in the fibre core provides pump energy, working-laser material is fluorescence excitation under the effect of pump light, if increase speculum this moment at the working-laser material two ends, gratings etc. provide certain light feedback just can form laser output, the output wavelength of laser output is determined by reflectance spectrum and the coefficient result of gain spectral, for fiber grating during as speculum, owing to be narrow spectrum reflection, output wavelength is exactly that (this wavelength must drop in the gain spectral certainly for the reflection wavelength of fiber grating, be preferably in high gain region), for the wide range speculum, in the high reflectance range of wavelengths, the highest-gain wavelength is exactly the final laser output wavelength that obtains.
In the present invention, by increasing the fixedly non-doped fiber 7 of tractive support 2, triangular supports 3, piezoelectric ceramic 4, cushion block 5, radio-frequency power supply 6 and double clad of optical fiber, its effect is to form at the non-doped fiber 7 of double clad to have the absorption spectra of certain depth, formation is to the modulation of original excitation spectrum, when changing the output frequency of radio-frequency power supply 6, just can change the centre wavelength of absorption spectra, thereby change the centre wavelength of the excitation spectrum after the modulation.
Embodiment:
As shown in Figure 1, follow technique scheme of the present invention, the rf modulations tunable whole-optical fibre laser based on fiber loop mirror of present embodiment comprises resonant cavity, gain fibre, pumping source and tunable optic filter four parts.
Resonant cavity: completely reflecting mirror is that coupling ratio is the 50:50 fiber loop mirror, and outgoing mirror is 4% non-Neil reflection of the fiber cut end face of output tail optical fiber 11, and the two all is the wide range speculum, can be adapted to any doped fiber and any wavelength.
Gain fibre: what double clad doped fiber 8 was chosen 6/125 μ m mixes the thulium doubly clad optical fiber, and the covering absorptivity is 1.4dB/m790nm, is 1.4dB/m in 790nm place covering absorptivity namely also, and the fibre core numerical aperture is 0.23, and fiber lengths is got 10m.Because thulium doped fiber has wideer gain spectral, so can realize bigger tuning range; Size at its tuning range of fiber laser of other doping depends primarily on the gain spectral of working-laser material in institute's doped fiber, and gain spectral is more wide to realize that tuning scope is also just more big.
The pumping part: it is 100 μ m that pumping source 10 is selected the output tail optical fiber of 790nm, and peak power output is the semiconductor laser of 35W.Wavelength division multiplexer 9 adopts output and signal end to be 6/125 μ m, and the pumping end is the wavelength division multiplexer of 100 μ m (1+1*1).
Tunable optic filter: non-doped fiber 7 physical dimensions of double clad and double clad doped fiber 8 couplings, namely select the non-doping double-cladding optical fiber of 6/125 μ m, the fibre core numerical aperture is 0.23, the non-doped fiber 7 of double clad is fixedly pushed down with press strip 24 around 4 circle backs on the tractive support 2 at optical fiber, every circle spacing 2mm, optical fiber fixedly on the tractive support 2 left lobe 21, right lobe 22 all than the high 1cm in triangular prism support 3 tops; The surrounding layer of oscillating component optical fiber is removed.Piezoelectric ceramic 4 adopts and is of a size of the rectangular sheet of 45*8*5mm.
The tuning range of the vibration frequency of radio-frequency power supply 6 needs to measure in advance, see also Fig. 2, inject wide range light signal by wide spectrum light source 12 from non-doped fiber 7 one ends of double clad via lens 13, this light source light spectrum scope should comprise the fluorescence Spectra of doped chemical in the double clad doped fiber 8, the other end at the non-doped fiber 7 of double clad is placed spectrometer 14, behind piezoelectric ceramic 4 connection radio-frequency power supplies 6, the absorption spectra that the vibration that measurement and record radio-frequency current cause produces, the gain fluorescence Spectra of absorption spectra and double clad doped fiber 8 is compared, and the corresponding frequency of intersection is exactly radio-frequency power supply 6 corresponding tuning ranges.
Experiment graph of a relation referring to the output wavelength of the radio frequency output frequency that Figure 3 shows that radio-frequency power supply 6 in the present embodiment and laser, therefore, the output wavelength of laser needs is adjusted the radio frequency output frequency of radio-frequency power supply 6 according to the present invention, and radio frequency output adjustable range is 1MHz～1.5MHz in this example.Make radio frequency power output comparable for good can satisfy by absorption spectra and gain spectral, this parameter is method acquisition by experiment also.
Finishing above-mentioned device selects and test, multiplexing end head and the tail phase welding successively with the non-doped fiber 7 of the 1st arm, the double clad of fiber loop mirror 1, double clad doped fiber 8, wavelength division multiplexer 9, pumping source 10 is molten mutually with the pumping input of wavelength division multiplexer 9, the signal end of wavelength division multiplexer 9 is as output tail optical fiber 11, the signal end of wavelength division multiplexer 9 is directly done cutting, with 4% non-Neil reflection of cutting end face as output reflector, the 2nd arm sling sky of fiber loop mirror 1 requires fibre core to aim at during welding.
Claims (10)
1. rf modulations tunable whole-optical fibre laser based on fiber loop mirror, it is characterized in that, comprise fiber loop mirror (1), optical fiber is tractive support (2) fixedly, triangular prism support (3), piezoelectric ceramic (4), cushion block (5), radio-frequency power supply (6), the non-doped fiber of double clad (7), double clad doped fiber (8), wavelength division multiplexer (9), pumping source (10) and output tail optical fiber (11), wherein, a wherein arm of described fiber loop mirror (1), the non-doped fiber of double clad (7), double clad doped fiber (8), the flashlight passage of wavelength division multiplexer (9) and output tail optical fiber (11) welding successively that joins end to end, another arm sling sky of fiber loop mirror (1) need not, the pump light passage welding of pumping source (10) and wavelength division multiplexer (9); Described optical fiber fixedly tractive support (2) comprises left lobe (21) and right lobe (22), connects by rigid cage (23) between described left lobe (21) and the right lobe (22); Left side lobe (21), right lobe (22) are flat cylinder in the outer arc, carve a plurality of parallel grooves (25) on left lobe (21), right lobe (22) outer arc; The non-doped fiber of double clad (7) is around optical fiber fixedly in the outside groove (25) of tractive support (2) and tension, triangular prism support (3) places on the piezoelectric ceramic (4), and cushion block (5) is established in piezoelectric ceramic (4) bottom makes the rib at triangular prism support (3) top contact the non-doped fiber of double clad (7); Described piezoelectric ceramic (4) connects radio-frequency power supply (6).
2. the rf modulations tunable whole-optical fibre laser based on fiber loop mirror as claimed in claim 1, it is characterized in that, described piezoelectric ceramic (4) causes the non-doped fiber of double clad (7) vibration when feeding radio-frequency power supply (6), make the non-doped fiber of double clad (7) fiber core refractive index generating period change and form long period fiber grating, the absorption spectra of generation centered by a certain wavelength, when the gain spectral of this absorption spectra and double clad doped fiber (8) overlapping, the change of the output frequency of radio-frequency power supply (6) makes the long-period gratings absorption spectra move, thereby makes gain spectral centre wavelength move; The output wavelength of described laser and gain spectral centre wavelength match, thereby the adjustment of the output frequency by regulating radio frequency (6) realizes the output wavelength that needs.
3. the rf modulations tunable whole-optical fibre laser based on fiber loop mirror as claimed in claim 1 is characterized in that, the distance between described left lobe (21) and the right lobe (22) is 8cm～30cm.
4. the rf modulations tunable whole-optical fibre laser based on fiber loop mirror as claimed in claim 1 is characterized in that, described left lobe (21), right lobe (22) are semicolumn, semiellipse post or rectangular band semicolumn.
5. the rf modulations tunable whole-optical fibre laser based on fiber loop mirror as claimed in claim 1, it is characterized in that, it is 2mm～5mm that described left lobe (21), right lobe (22) are gone up adjacent groove (25) spacing, and groove depth equals the non-doped fiber of double clad (7) surrounding layer radius.
6. the rf modulations tunable whole-optical fibre laser based on fiber loop mirror as claimed in claim 1 is characterized in that, described left lobe (21), right lobe (22) top are equipped with press strip (24).
7. the rf modulations tunable whole-optical fibre laser based on fiber loop mirror as claimed in claim 1 is characterized in that the drift angle of described triangular prism support (3) is with 30 °～60 °.
8. the rf modulations tunable whole-optical fibre laser based on fiber loop mirror as claimed in claim 1 is characterized in that, the non-doped fiber of described double clad (7) fixedly twines 4 circles, every circle spacing 2mm in tractive support (2) outside at optical fiber.
9. the rf modulations tunable whole-optical fibre laser based on fiber loop mirror as claimed in claim 1 is characterized in that, it is 50:50 that described fiber loop mirror (1) adopts coupling ratio.
10. the rf modulations tunable whole-optical fibre laser based on fiber loop mirror as claimed in claim 1, it is characterized in that, the signal end of described wavelength division multiplexer (9) is as output tail optical fiber (11), and 4% Fei Nier of the cut surface of output tail optical fiber (11) is reflected into outgoing mirror.
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| CN104466634A (en) * | 2014-11-25 | 2015-03-25 | 武汉光迅科技股份有限公司 | Linear cavity doped fiber laser device |
| CN105137624A (en) * | 2015-09-25 | 2015-12-09 | 西北工业大学 | Device and method for generating columnar vector beams in optical fiber by utilizing electrically-controlled tunable optical grating |
| CN117589312A (en) * | 2024-01-16 | 2024-02-23 | 中国工程物理研究院激光聚变研究中心 | Wavelength following characteristic measuring device and method for semiconductor laser pumping source |
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| CN117589312A (en) * | 2024-01-16 | 2024-02-23 | 中国工程物理研究院激光聚变研究中心 | Wavelength following characteristic measuring device and method for semiconductor laser pumping source |
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