CN203387045U - Optical fiber end-pumped laser - Google Patents
Optical fiber end-pumped laser Download PDFInfo
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- CN203387045U CN203387045U CN201320334929.9U CN201320334929U CN203387045U CN 203387045 U CN203387045 U CN 203387045U CN 201320334929 U CN201320334929 U CN 201320334929U CN 203387045 U CN203387045 U CN 203387045U
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Abstract
The utility model discloses an optical fiber end-pumped laser. The optical fiber end-pumped laser comprises a semiconductor pumping source, a transmission module, a coupling module, a resonant cavity and semiconductor refrigeration modules, wherein the resonant cavity comprises a laser crystal, and the semiconductor refrigeration modules are respectively disposed on the semiconductor pumping source and the laser crystal; and pump light emitted by the semiconductor pumping source is transmitted and homogenized by the transmission module and then enters into the coupling module, the pump light processed by the transmission module is coupled into the laser crystal in the resonant cavity by the coupling module, the laser crystal is excited by the pump light to generate a gain laser, and the gain laser is output after being processed by the resonant cavity. High peak power quasi-continuous pump light is transmitted and homogenized by using an energy optical fiber with a large diameter to make the pump light extremely uniform; high energy end pumping is used, efficiency is high, and power consumption is low; and a divergence angle is ensured to be small in the case that high peak power high energy and high beam quality output are ensured.
Description
Technical field
The utility model relates to all solid state laser technical field, relates in particular to a kind of fiber end face pump laser.
Background technology
All solid state laser (Diode Pumped solid state Laser is called for short DPL) has the advantages such as efficiency is high, stable performance, good reliability, life-span length, and the market demand is very huge.The all-solid state laser technology is that current China is few in number from the material source until one of integrated high-tech sector that has global advantage of laser system in the world, possessed the good basis in the certain fields accelerated development, become the main direction of Development of Laser Technology.The DPL of Non-water-cooled high-peak power is little, lightweight with its volume, the efficiency high develops rapidly in fields such as military and national defense, health care and Space-Based Radars, and its research receives very big concern.
By pump mode, classify, the Non-water-cooled all solid state laser can be divided into the types such as profile pump, end pumping and mixing pumping.End pumping Non-water-cooled laser, in order to obtain large energy output, adopt the leaded light cone pump light to be coupled into to the form of laser crystal, but the exiting surface of leaded light cone must be near the laser crystal end face, crystal end-face plates the film that is all-trans, and there is no total reflective mirror, is unfavorable for compressing the angle of divergence.Employing vertical cavity surface emitting laser (Vertical Cavity Surface Emitting Laser is also arranged, be called for short VCSEL) as the end pumping source, because its launch spot is round property, easy of integration is the large tracts of land array, can directly focus on plane of crystal, after increase, during anti-mirror, its output beam quality is good, the angle of divergence is little, but the output energy only has 18mJ.
How, in the situation that Non-water-cooled is all solid state, the output of high-peak power macro-energy, guaranteeing the beam quality that the little angle of divergence is become reconciled, is the technical barrier that current urgent need solves.
The utility model content
The technical problems to be solved in the utility model is to provide a kind of fiber end face pump laser, in the situation that the output high-peak power guarantees higher beam quality.
The technical solution adopted in the utility model is, described fiber end face pump laser, comprise: semiconductor pumping sources, transport module, coupling module, resonant cavity and semiconductor refrigerating module, wherein, comprise laser crystal in resonant cavity, the semiconductor refrigerating module is arranged at respectively on semiconductor pumping sources and laser crystal;
The pump light that semiconductor pumping sources sends through transport module transmit and homogenize after enter coupling module, pump light after coupling module is processed transport module is coupled into the laser crystal of resonant cavity, laser crystal produces gain laser under the excitation of pump light, and gain laser is output after resonant cavity is processed.
Further, as a kind of optional technical scheme, in described resonant cavity, double-colored plano-concave mirror and flat output mirror are as the border of resonant cavity, pump light sees through double-colored plano-concave mirror and incides in laser crystal, laser crystal produces gain laser under the excitation of pump light, and gain laser is injected flat output mirror through polarizer, quarter-wave plate, Pockers cell after processing successively, by flat output mirror, is reflected and transmission.
When further, the level inversion population in laser crystal reaches maximum, be that Pockers cell powers on.
Further, as the optional technical scheme of another kind, in described resonant cavity, double-colored plano-concave mirror and flat output mirror are as the border of resonant cavity, pump light sees through double-colored plano-concave mirror and incides in laser crystal, laser crystal produces gain laser under the excitation of pump light, and gain laser is injected flat output mirror after passive Q-adjusted crystal is processed, and by flat output mirror, is reflected and transmission.
Further, described passive Q-adjusted crystal is KD*P crystal or Cr4+:YAG crystal.
Further, the peak power≤2000W of the pump light that described semiconductor pumping sources provides, the pulse modulation width is 100～480 μ s, repetition rate is 10～100Hz;
Described transport module is energy optical fiber, and its core diameter is 800～1000 μ m.
Further, described laser crystal is Nd:YAG crystal or Nd:YLF or Nd:YVO4 crystal, and its length is 60～80mm, and mixing atomic fraction is 0.8～1%.
Further, described coupling module adopts optical coupling system;
When the coupling ratio of described coupling module is 1:4, the laser crystal diameter is 5mm;
When the coupling ratio of described coupling module is 1:5, the laser crystal diameter is 6mm;
When the coupling ratio of described coupling module is 1:6, the laser crystal diameter is 7mm.
Further, described semiconductor refrigerating module is controlled at 23 ± 0.1 ℃ by the temperature of semiconductor pumping sources and laser crystal.
Further, plane one side of described double-colored plano-concave mirror is coated with the pump light anti-reflection film, and concave surface one side is coated with pump light anti-reflection film and the gain laser film that is all-trans successively;
Described flat output mirror is selected transmitance corresponding when maximum to gain laser output energy to the transmitance of gain laser.
Adopt technique scheme, fiber end face pump laser described in the utility model at least has following advantages:
1) adopt energy optical fiber transmission and the homogenize high-peak power quasi-cw pumping light that diameter is thick, make pump light extremely evenly.
2) adopt the macro-energy end pumping, efficiency is high, and power consumption is little.
3) in the situation that assurance high-peak power macro-energy and high light beam quality output can also guarantee the little angle of divergence.
The accompanying drawing explanation
The light channel structure schematic diagram of the single-ended pump laser of optical fiber that Fig. 1 is the utility model the first embodiment;
The pulsed light wave figure of the single-ended pump laser output of the optical fiber that Fig. 2 is the utility model the first embodiment;
The light channel structure schematic diagram of the single-ended pump laser of optical fiber that Fig. 3 is the utility model the second embodiment;
The light channel structure schematic diagram of the single-ended pump laser of optical fiber that Fig. 4 is the utility model the 3rd embodiment.
Embodiment
Be to reach technological means and the effect that predetermined purpose is taked for further setting forth the utility model, below in conjunction with accompanying drawing and preferred embodiment, the utility model be elaborated as rear.
The utility model the first embodiment, a kind of fiber end face pump laser, as shown in Figure 1, the single-ended pump laser of described optical fiber comprises its light channel structure schematic diagram: semiconductor pumping sources 1, for high-peak power pulse (quasi-continuous) pump light is provided; Energy optical fiber 2, for being transmitted and homogenize this pump light; Coupled system 3, be suitable for pump light is coupled into to the laser crystal 5 in resonant cavity, double-colored plano-concave mirror 4 and the border of flat output mirror 9 as resonant cavity; Laser crystal 5, provide gain, under the excitation of pump light, produces gain laser; Double-colored plano-concave mirror 4, for the transmission pump light, reflection gain laser; Polarizer 6, play partially laser, produces vertical direction polarised light or horizontal direction polarised light; Quarter-wave plate 7, laser is by 45 ° of its polarization direction rotations; Pockers cell 8, control the voltage applied on it, makes when this Pockers cell not being applied to voltage and be equivalent to plain film, is equivalent to the effect of quarter-wave plate when this Pockers cell is applied to 3800V voltage; Flat output mirror 9, part sees through laser and part reflector laser.
Wherein, the pump light sent from semiconductor pumping sources 1 is through energy optical fiber 2 homogenizes and transmission, by coupled system 3 and double-colored plano-concave mirror 4, incide on laser crystal 5, vibration back and forth in the resonant cavity of double-colored plano-concave mirror 4 and flat output mirror 9 compositions after the laser starting of oscillation, after the inverted population that laser crystal 5 is accumulated reaches maximum, through Pockers cell 8, adjust the Q Output of lasers.
Peak power≤the 2000W of the pump light that semiconductor pumping sources 1 provides, the pulse modulation width is 100～480 μ s, repetition rate is 10～100Hz.The core diameter of energy optical fiber is 800～1000 μ m.
Laser crystal 5 can be Nd:YAG crystal or Nd:YLF or Nd:YVO
4crystal, its length is 60～80mm, mixing atomic fraction is 0.8～1%.That preferably, laser crystal 5 adopts is Nd:YAG crystal or Nd:YLF.
Preferably, the semiconductor laser in semiconductor pumping sources 1, at 25 ℃ of output wavelength 808nm pump lights, is exported maximum peak power 2000W when input current 190A, and the pulse modulation width of pump light is 250 μ s, so maximum output single pulse energy 500mJ.Semiconductor pumping sources 1 is by a slice 57W power semiconductor cooling piece refrigeration, and temperature is controlled in 23 ± 0.1 ℃ of scopes.High-peak power 808nm pump light is that 800 μ m energy optical fibers 2 are transferred to coupled system 3 by core diameter, energy optical fiber 2 maximums are born peak power 8KW, energy optical fiber 2 length are 2m, make the 808nm pump light become very even in transmitting procedure, in transmitting procedure, the loss of 808nm pump light is less than 1%.The 808nm pump light enters laser crystal 5 by coupled system 3 uniformly, and the coupling ratio of coupled system 3 is 1:4, so the minimum light spot diameter in crystal is 3.2mm.Laser crystal 5 is the Nd:YAG crystal, and mixing atomic fraction is 0.8%, and diameter is 5mm, and length is 60mm.The Nd:YAG crystal is by a slice 40W power semiconductor cooling piece refrigeration, and temperature is controlled in 23 ± 0.1 ℃ of scopes.
In resonant cavity, double-colored plano-concave mirror 4 plane one sides plating 808nm pump light anti-reflection films, concave surface one side plating 1064nm gain laser be all-trans film and 808nm pump light anti-reflection film, radius of curvature is 8～12m, preferably 10m.Flat output mirror 9 plates the 1064nm deielectric-coating that sees through 70% in resonant cavity, another side plating 1064nm anti-reflection film.Total chamber length of the resonant cavity of the present embodiment can be accomplished only 14cm.
808nm pump light pumping laser crystal 5, make its population inversion, Emission Lasers, laser is inclined to one side by 6 of polarizers, suppose that polarization direction is vertical direction, the laser of vertical direction is by quarter-wave plate 7,45 ° of polarization direction rotations, now do not add the 3800V high pressure on the KD*P crystal in Pockers cell 8, is equivalent to plain film, laser does not change by KD*P crystal polarization direction, through double-colored plano-concave mirror 4 reflections, again by quarter-wave plate 7, polarization direction rotates 45 ° again, now, just become 90 ° with polarizer 6 printing opacity directions, laser can not pass through.When the level inversion population reaches maximum on the Nd:YAG crystal, reach maximum during normally through 230 μ s, add the 3800V high pressure now to the KD*P crystal, laser is by flat output mirror 9 output 1064nm laser.
At input current 160A, during repetition rate 20Hz, carefully regulate double-colored plano-concave mirror 4 and flat output mirror 9, make its output energy maximum, and by CCD(Charge-coupled Device, charge coupled cell) observe output facula, make hot spot round.Then strengthen gradually electric current, when 190A, export maximum single pulse energy 82mJ, the light light conversion efficiency reaches 16.4%, and the Output of laser angle of divergence is 1.7mrad, and as shown in Figure 2, pulse duration is 8.2ns to output pulse waveform.
The utility model the second embodiment, a kind of fiber end face pump laser, its light channel structure schematic diagram as shown in Figure 3, the described fiber end face pump laser of the present embodiment and the first embodiment's is roughly the same, difference is, passive Q-adjusted polarizer, quarter-wave plate and the Pockers cell replaced in the first embodiment resonant cavity for the present embodiment, the effect of playing is identical.
The single-ended pump laser of this optical fiber comprises: semiconductor pumping sources 1, energy optical fiber 2, coupled system 3, double-colored plano-concave mirror 4, laser crystal 5, the passive Q-adjusted crystal 6 of Cr4+:YAG, flat output mirror 7.
Concrete, passive Q-adjusted crystal 6 initial transmissions of Cr4+:YAG are 30%, and 7 pairs of 1064nm transmitances of flat output mirror are 50%, and the resonant cavity that double-colored plano-concave mirror 4 and flat output mirror 7 form can be accomplished 11cm.At input current 190A, during repetition rate 20Hz, output single pulse energy 57mJ, light light conversion efficiency 11.4%, pulse duration 7.9ns.
The utility model the 3rd embodiment, a kind of fiber end face pump laser, its light channel structure schematic diagram as shown in Figure 4, the described fiber end face pump laser of the present embodiment is identical with the principle of the first embodiment, difference is, the present embodiment adopts the both-end pumped fiber, makes the two-way pump light incide two end faces of a laser crystal 5 simultaneously.
As shown in Figure 4, this fiber end face pump laser, comprise: the first semiconductor pumping sources 1 and the second semiconductor pumping sources 9, the first energy optical fibers 2 and the second energy optical fiber 8, the first coupled systems 3 and the second coupled system 7, resonant cavity comprises: first double-colored 45 ° of level crossings 4 and second double-colored 45 ° of level crossings 6, Nd:YAG laser crystal 5, plano-concave total reflective mirror 10, Pockers cell 11, quarter-wave plate 12, polarizer 13 and flat output mirror 14.First double-colored 45 ° of level crossings 4 and second double-colored 45 ° of level crossings 6 be coated with anti-reflection film towards pump light one side, be coated with towards a side of gain laser the film that is all-trans.The border of resonant cavity is still plano-concave total reflective mirror 10 and flat output mirror 14.
When the both-end pumped fiber, pump energy is increased to 1000mJ, and the pulse duration of pump light is 250 μ s.When repetition rate 20Hz, export maximum single pulse energy 150mJ, hot spot is very even, and the angle of divergence is 1.9mrad.
Laser crystal 5 can also be changed to the Nd:YLF crystal, the pump light wavelength is changed to 798nm, and pumping width 480 μ s and mate corresponding glasses lens plated parameter can export the 1053nm laser of low repetition, macro-energy, high light beam quality.
Should illustrate, above embodiment is only unrestricted in order to the technical solution of the utility model to be described, those of ordinary skill in the art is to be understood that, the technical solution of the utility model is modified or is equal to replacement, such as using similar chamber type, strengthen pump power, shorten chamber long in the type of similar chamber, replace gain crystal and the parameters such as corresponding glasses lens plated parameter and curvature and do not break away from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (10)
1. a fiber end face pump laser, it is characterized in that, comprising: semiconductor pumping sources, transport module, coupling module, resonant cavity and semiconductor refrigerating module, wherein, comprise laser crystal in resonant cavity, the semiconductor refrigerating module is arranged at respectively on semiconductor pumping sources and laser crystal;
The pump light that semiconductor pumping sources sends through transport module transmit and homogenize after enter coupling module, pump light after coupling module is processed transport module is coupled into the laser crystal of resonant cavity, laser crystal produces gain laser under the excitation of pump light, and gain laser is output after resonant cavity is processed.
2. fiber end face pump laser according to claim 1, it is characterized in that, in described resonant cavity, double-colored plano-concave mirror and flat output mirror are as the border of resonant cavity, pump light sees through double-colored plano-concave mirror and incides in laser crystal, laser crystal produces gain laser under the excitation of pump light, and gain laser is injected flat output mirror through polarizer, quarter-wave plate, Pockers cell after processing successively, by flat output mirror, is reflected and transmission.
3. fiber end face pump laser according to claim 2, is characterized in that, the level inversion population in laser crystal is that Pockers cell powers on while reaching maximum.
4. fiber end face pump laser according to claim 1, it is characterized in that, in described resonant cavity, double-colored plano-concave mirror and flat output mirror are as the border of resonant cavity, pump light sees through double-colored plano-concave mirror and incides in laser crystal, laser crystal produces gain laser under the excitation of pump light, and gain laser is injected flat output mirror after passive Q-adjusted crystal is processed, and by flat output mirror, is reflected and transmission.
5. fiber end face pump laser according to claim 4, is characterized in that, described passive Q-adjusted crystal is KD*P crystal or Cr4+:YAG crystal.
6. fiber end face pump laser according to claim 1, is characterized in that, the peak power≤2000W of the pump light that described semiconductor pumping sources provides, and the pulse modulation width is 100～480 μ s, repetition rate is 10～100Hz;
Described transport module is energy optical fiber, and its core diameter is 800～1000 μ m.
7. fiber end face pump laser according to claim 1, is characterized in that, described laser crystal is Nd:YAG crystal or Nd:YLF or Nd:YVO
4crystal, its length is 60～80mm, mixing atomic fraction is 0.8～1%.
8. fiber end face pump laser according to claim 1, is characterized in that, described coupling module adopts optical coupling system;
When the coupling ratio of described coupling module is 1:4, the laser crystal diameter is 5mm;
When the coupling ratio of described coupling module is 1:5, the laser crystal diameter is 6mm;
When the coupling ratio of described coupling module is 1:6, the laser crystal diameter is 7mm.
9. fiber end face pump laser according to claim 1, is characterized in that, described semiconductor refrigerating module is controlled at 23 ± 0.1 ℃ by the temperature of semiconductor pumping sources and laser crystal.
10. fiber end face pump laser according to claim 2, is characterized in that, plane one side of described double-colored plano-concave mirror is coated with the pump light anti-reflection film, and concave surface one side is coated with pump light anti-reflection film and the gain laser film that is all-trans successively;
Described flat output mirror is selected transmitance corresponding when maximum to gain laser output energy to the transmitance of gain laser.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320334929.9U CN203387045U (en) | 2013-06-09 | 2013-06-09 | Optical fiber end-pumped laser |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337775A (en) * | 2013-06-09 | 2013-10-02 | 中国电子科技集团公司第十一研究所 | Optical fiber end-pumped laser |
| CN105322429A (en) * | 2015-11-19 | 2016-02-10 | 中国科学院合肥物质科学研究院 | Semiconductor laser end plane pumping Er: YSGG electro-optical Q-switched laser |
| CN105470804A (en) * | 2015-12-28 | 2016-04-06 | 中国电子科技集团公司第十一研究所 | Diode pumped solid state laser (DPL) and debugging method therefor |
-
2013
- 2013-06-09 CN CN201320334929.9U patent/CN203387045U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337775A (en) * | 2013-06-09 | 2013-10-02 | 中国电子科技集团公司第十一研究所 | Optical fiber end-pumped laser |
| CN103337775B (en) * | 2013-06-09 | 2015-12-23 | 中国电子科技集团公司第十一研究所 | A kind of fiber end face pump laser |
| CN105322429A (en) * | 2015-11-19 | 2016-02-10 | 中国科学院合肥物质科学研究院 | Semiconductor laser end plane pumping Er: YSGG electro-optical Q-switched laser |
| CN105470804A (en) * | 2015-12-28 | 2016-04-06 | 中国电子科技集团公司第十一研究所 | Diode pumped solid state laser (DPL) and debugging method therefor |
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Granted publication date: 20140108 |