CN204885810U - Four crystal U die cavity laser instruments of high power end pump - Google Patents
Four crystal U die cavity laser instruments of high power end pump Download PDFInfo
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- CN204885810U CN204885810U CN201520605771.3U CN201520605771U CN204885810U CN 204885810 U CN204885810 U CN 204885810U CN 201520605771 U CN201520605771 U CN 201520605771U CN 204885810 U CN204885810 U CN 204885810U
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Abstract
The utility model discloses a four crystal U die cavity laser instruments of high power end pump, including the resonant cavity, the Q -switch, by the pumping unit, the end pump device that coupled system and laser crystal constitute, the resonant cavity is including being all -trans mirror and outgoing mirror, the end pump device has four, per two end pump devices constitute an end pump group, two end pump group symmetries set up, the optical axis of two end pump devices of each end pump group intersects vertically, the position that intersects vertically of the optical axis of two end pump devices of each end pump group is equipped with a pentagonal prism, pentagonal prism is located between the laser crystal and coupled system of each end pump device, the resonant cavity is by the mirror that is all -trans, " U " type refrative cavity that two pentagonal prism and outgoing mirror constitute. The utility model discloses a four crystal U die cavity laser instruments of high power end pump can produce high power laser and optical quality is high, has guaranteed the stability of laser instrument and the convenience of installation and debugging.
Description
Technical field
The utility model relates to a kind of laser, particularly relates to the U-shaped cavity laser of a kind of high power end pumping four crystal.
Background technology
For the manufacture of the laser-processing system of industry, require that laser has high power laser light output, high light beam quality, high long-time stability, these require to be difficult to meet simultaneously, usually can only select within the specific limits to meet.Such as conventional diode pumping solid laser, the pump mode of usual laser diode to laser crystal mainly contains two kinds: end pumping structure and profile pump.
In LD profile pump structure, the laser of LD radiation is usually perpendicular to the resonant cavity axle of laser, direct irradiation or be irradiated to the side of laser crystal after being transmitted by light-guide device, large-area gain regions is produced in laser crystal, provide the foundation for high-power laser produces, but shortcoming is that the beam quality difference of Output of laser and energy extraction efficiency are low.
In LD end pumping structure, LD radiation laser beam is from laser crystal surface feeding sputtering, greatly reduce the coupling loss of pump light, simultaneously, the gain regions produced at crystal end-face due to this pumping configuration is limited, makes laser crystal can have the very high gain of light in less pumped region, this be laser efficient energy extract and high light beam quality output provide good condition, but relatively little gain regions, its power output is restricted.
In numerous laser diode end-face pump solid laser, great majority adopt single-ended pump mode, the method of double-end pumping mode and double-end pumping bicrystal, due to by pump power can not be too high, the impacts such as crystal heat conductivility, thermal effect, laser output power is not high, also may there is the problem such as laser beam quality and laser stability.
Meanwhile, refrative cavity many employings level crossing of conventional laser turns to as light path, therefore there is Installation and Debugging difficulty, easily produces unstable problem.
Utility model content
The purpose of this utility model is to provide the U-shaped cavity laser of a kind of high power end pumping four crystal, while generation high power laser light, can meet the requirement of high light beam quality, and ensure that the stability of laser and the convenience of Installation and Debugging.
For achieving the above object, the utility model provides a kind of high power end pumping four crystal U-shaped cavity laser, comprise resonant cavity, be located at the Q switching in resonant cavity, and by pump unit, the end pumping device that coupled system and laser crystal are formed, resonant cavity comprises total reflective mirror and outgoing mirror, described end pumping device has four, every two end pumping devices form an end pumping group, two end pumping groups are symmetrical arranged, the optical axis of two end pumping devices of each end pumping group intersects vertically, the position that intersects vertically of the optical axis of two end pumping devices of each end pumping group is provided with a pentagonal prism that can make outgoing after incident laser beam half-twist, pentagonal prism is between the laser crystal and coupled system of each end pumping device, resonant cavity also comprises the pentagonal prism of two end pumping groups, resonant cavity is by total reflective mirror, " U " type refrative cavity that two pentagonal prisms and outgoing mirror are formed.
As further improvement of the utility model, described total reflective mirror is level crossing, and the lower surface of level crossing is coated with the high anti-deielectric-coating of 808nm, 1064nm.
As further improvement of the utility model, described outgoing mirror is level crossing, is coated with the 1064nm anti-reflection film that the high anti-deielectric-coating of 808nm and transmitance are 20%, is coated with the high anti-deielectric-coating of 1064nm outside its chamber in its chamber.
As further improvement of the utility model, described pentagonal prism has two for the inner surface of laser incidence and the outer surface of two reflects laser, two inner surfaces are adjacent and towards resonant cavity, two outer surfaces connect with an inner surface respectively, the outer surface of pentagonal prism tool is coated with 808nm anti-reflection film and the high anti-deielectric-coating of 1064nm, and the inner surface of pentagonal prism is coated with 808nm and 1064nm anti-reflection film.
Further improve as of the present utility model, the angle of two inner surfaces of described pentagonal prism is 90 °, and the inner surface of pentagonal prism and outer surface angle are 67.5 °.
As further improvement of the utility model, the power output of described pump unit is 30W, centre wavelength 808nm.
As further improvement of the utility model, described laser crystal adopts the Nd:YVO4 crystal of cooling by water, and doping content is 0.25%, and specification is 4 × 4 × 12mm, and its two sides is coated with 1064nm anti-reflection film.
As further improvement of the utility model, described Q switching is adopt the acoustooptic Q-switching of vitreous silica, and its supersonic frequency is 40.68MHz, and it is two-sided is coated with 1064nm anti-reflection film.
As further improvement of the utility model, described coupled system is the coupling mirror be made up of two-piece type lens, and two panels lens are all coated with the anti-reflection film of 808nm, and its magnification ratio is 1:2.
Compared with prior art, the beneficial effect of the U-shaped cavity laser of high power end pumping four crystal of the present utility model is as follows:
(1) the U-shaped cavity laser of high power end pumping four crystal adopts U-shaped refrative cavity structure, the straight chamber of laser relative tradition is made to substantially reduce length at cavity length direction, ensure that laser volume is less, more compact structure, be convenient to be integrated in various laser-processing system, and ensure that four pumpings can incide the topology layout on laser crystal.
(2) the U-shaped cavity laser of high power end pumping four crystal utilizes the mode of four series crystal rod difference pumping, by increasing the method for laser crystal quantity, decrease the pump power that laser crystal unit are is born, dispersion pyrotoxin, improves laser output power.
(3) the U-shaped cavity laser of high power end pumping four crystal adopts pentagonal prism as the structure of 90 degree of corners, even if during the skew of pentagonal prism occurrence positions, as long as two pentagonal prisms are still in light path, just can ensure that light path is stable and not occur change, thus ensure that the stability of laser and the convenience of Installation and Debugging, particularly when laser breaks down, easily investigate reason, facilitate the maintenance of laser.
(4) the U-shaped cavity laser of high power end pumping four crystal is because laser is at two secondary reflections of pentagonal prism inner surface, form a light path instead of linear transmission of turning back, shorten light path when identical light path, further reduce laser volume, improve the compactedness of equipment.
By following description also by reference to the accompanying drawings, the utility model will become more clear, and these accompanying drawings are for explaining embodiment of the present utility model.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the U-shaped cavity laser of the utility model high power end pumping four crystal.
Fig. 2 is the schematic diagram of pentagonal prism.
Embodiment
With reference now to accompanying drawing, describe embodiment of the present utility model, element numbers similar in accompanying drawing represents similar element.
Please refer to Fig. 1-2, the end pumping device that the described U-shaped cavity laser of high power end pumping four crystal comprises resonant cavity, is located at the Q switching 1 in resonant cavity and is made up of pump unit 2, coupled system 3 and laser crystal 4.
Described end pumping device has four, every two end pumping devices form an end pumping group, two end pumping groups are symmetrical arranged, the optical axis of two end pumping devices of each end pumping group intersects vertically, the position that intersects vertically of the optical axis of two end pumping devices of each end pumping group is provided with a pentagonal prism 5, pentagonal prism 5 is between the laser crystal 4 and coupled system 3 of each end pumping device, and two pentagonal prisms 5 tilt and are symmetrical arranged.
Described resonant cavity comprises the pentagonal prism 5 of two end pumpings, total reflective mirror 6 and outgoing mirror 7, and resonant cavity forms " U " type refrative cavity by total reflective mirror 6, two pentagonal prisms 5 and outgoing mirror 7.
Wherein, described Q switching 1 is adopt the acoustooptic Q-switching of vitreous silica, and its supersonic frequency is 40.68MHz, and it is two-sided is coated with 1064nm anti-reflection film, for modulating generation pulse laser.The power output of described pump unit 2 is 30W, centre wavelength 808nm.Described coupled system 3 is the coupling mirror be made up of two-piece type lens, and for pump light is focused on laser crystal 4, two panels lens are all coated with the anti-reflection film of 808nm, and its magnification ratio is 1:2.Described laser crystal 4 adopts the Nd:YVO4 crystal of cooling by water, and doping content is 0.25%, and specification is 4 × 4 × 12mm, and its two sides is coated with 1064nm anti-reflection film.Described pentagonal prism 5 has two outer surface 5b for inner surface 5a and two reflects laser of laser incidence, two inner surface 5a are adjacent and towards resonant cavity, two outer surface 5b connect with an inner surface 5a respectively, the angle of two inner surface 5a of pentagonal prism 5 is 90 °, the inner surface 5a of pentagonal prism 5 is coated with 808nm and 1064nm anti-reflection film, the inner surface 5a of pentagonal prism 5 and the angle of outer surface 5b are 67.5 °, and the outer surface 5b of pentagonal prism 5 is coated with 808nm anti-reflection film and the high anti-deielectric-coating of 1064nm.The 1064nm laser that laser crystal 4 produces is incident from arbitrary inner surface 5a of pentagonal prism 5, exports, make light beam form the rotation of 90 ° of angles after two outer surface 5b reflect from another inner surface 5a.Described total reflective mirror 6 is level crossing, and the lower surface of level crossing is coated with the high anti-deielectric-coating of 808nm, 1064nm.Described outgoing mirror 7 is level crossing, is coated with the 1064nm anti-reflection film that the high anti-deielectric-coating of 808nm and transmitance are 20%, is coated with the high anti-deielectric-coating of 1064nm outside its chamber in its chamber.
During work, the pump light produced by the pump unit 2 of each end pumping device through coupled system 3 respectively by behind the outer surface 5b of pentagonal prism 5, inner surface 5a two faces, focus on respectively on laser crystal 4 end face and carry out pumping, form the resonance amplification that four crystal bar series systems carry out laser, thus obtain larger mode volume, realize the high-power output of laser.Laser generation, in " U " type refrative cavity be made up of total reflective mirror 6, two pentagonal prisms 5 and outgoing mirror 7, produces pulse laser, and goes out 1064nm laser by outgoing mirror 7 under the modulating action of Q switching 1.
The direction of propagation being the laser made in resonant cavity due to pentagonal prism 5 effect changes 90 °, two pentagonal prisms 5 make the laser in resonant cavity form the rotation of 180 °, form a symmetrical U-shaped structure, the structure of such symmetric configuration is not only conducive to the pumping input of four pump lights, and meet the requirement to crystal bar and chamber mirror symmetric position of four rod series laser devices, and reduce the volume of laser, shorten light path when identical light path, increase the compactedness of laser.And, no matter incident at any angle the input light of pentagonal prism 5 is, its exit direction all turns over 90 °, when pentagonal prism 5 occurrence positions offsets, as long as two pentagonal prisms 5 are still in light path, just can ensure that light path is stable and not occur change, thus ensure that stability and the laser-quality of Laser output.In addition, the U-shaped cavity laser of high power end pumping four crystal analyzes distance and the excellent mirror between thermal focal coupling and crystal of crystal thermal focal, four crystal bars apart from relation between the two simultaneously, obtains crystal thermal focal and must be greater than 0.5 times of excellent mirror distance; The spacing of crystal necessary equal, four crystal bar thermal focals also must equal guarantee thermal focal coupling; The spacing of crystal must equal 2 times of excellent mirror distance, and design employs symmetrical U-shaped cavity resonator structure, and ensure that resonant cavity has maximum stable region working range, laser obtains stable high-power output.
More than in conjunction with most preferred embodiment, the utility model is described, but the utility model is not limited to the embodiment of above announcement, and should contain various carry out according to essence of the present utility model amendment, equivalent combinations.
Claims (9)
1. the U-shaped cavity laser of high power end pumping four crystal, comprise resonant cavity, be located at the Q switching in resonant cavity, and by pump unit, the end pumping device that coupled system and laser crystal are formed, resonant cavity comprises total reflective mirror and outgoing mirror, it is characterized in that: described end pumping device has four, every two end pumping devices form an end pumping group, two end pumping groups are symmetrical arranged, the optical axis of two end pumping devices of each end pumping group intersects vertically, the position that intersects vertically of the optical axis of two end pumping devices of each end pumping group is provided with a pentagonal prism that can make outgoing after incident laser beam half-twist, pentagonal prism is between the laser crystal and coupled system of each end pumping device, resonant cavity also comprises the pentagonal prism of two end pumping groups, resonant cavity is by total reflective mirror, " U " type refrative cavity that two pentagonal prisms and outgoing mirror are formed.
2. the U-shaped cavity laser of high power end pumping four crystal as claimed in claim 1, is characterized in that: described total reflective mirror is level crossing, and the lower surface of level crossing is coated with the high anti-deielectric-coating of 808nm, 1064nm.
3. the U-shaped cavity laser of high power end pumping four crystal as claimed in claim 1, it is characterized in that: described outgoing mirror is level crossing, be coated with the 1064nm anti-reflection film that the high anti-deielectric-coating of 808nm and transmitance are 20% in its chamber, outside its chamber, be coated with the high anti-deielectric-coating of 1064nm.
4. the U-shaped cavity laser of high power end pumping four crystal as claimed in claim 1, it is characterized in that: described pentagonal prism has two for the inner surface of laser incidence and the outer surface of two reflects laser, two inner surfaces are adjacent and towards resonant cavity, two outer surfaces connect with an inner surface respectively, the outer surface of pentagonal prism tool is coated with 808nm anti-reflection film and the high anti-deielectric-coating of 1064nm, and the inner surface of pentagonal prism is coated with 808nm and 1064nm anti-reflection film.
5. the U-shaped cavity laser of high power end pumping four crystal as claimed in claim 4, is characterized in that: the angle of two inner surfaces of described pentagonal prism is 90 °, and the inner surface of pentagonal prism and outer surface angle are 67.5 °.
6. the U-shaped cavity laser of high power end pumping four crystal as claimed in claim 1, is characterized in that: the power output of described pump unit is 30W, centre wavelength 808nm.
7. the U-shaped cavity laser of high power end pumping four crystal as claimed in claim 1, is characterized in that: described laser crystal adopts the Nd:YVO4 crystal of cooling by water, and doping content is 0.25%, and specification is 4 × 4 × 12mm, and its two sides is coated with 1064nm anti-reflection film.
8. the U-shaped cavity laser of high power end pumping four crystal as claimed in claim 1, is characterized in that: described Q switching is the acoustooptic Q-switching adopting vitreous silica, and its supersonic frequency is 40.68MHz, and it is two-sided is coated with 1064nm anti-reflection film.
9. the U-shaped cavity laser of high power end pumping four crystal as claimed in claim 1, it is characterized in that: described coupled system is the coupling mirror be made up of two-piece type lens, and two panels lens are all coated with the anti-reflection film of 808nm, its magnification ratio is 1:2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520605771.3U CN204885810U (en) | 2015-08-12 | 2015-08-12 | Four crystal U die cavity laser instruments of high power end pump |
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| CN201520605771.3U CN204885810U (en) | 2015-08-12 | 2015-08-12 | Four crystal U die cavity laser instruments of high power end pump |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105514777A (en) * | 2016-01-30 | 2016-04-20 | 长春理工大学 | Folded cavity laser |
| CN107221832A (en) * | 2017-08-01 | 2017-09-29 | 南京先进激光技术研究院 | A kind of U-shaped cavity laser that can efficiently debug and its adjustment method |
-
2015
- 2015-08-12 CN CN201520605771.3U patent/CN204885810U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105514777A (en) * | 2016-01-30 | 2016-04-20 | 长春理工大学 | Folded cavity laser |
| CN105514777B (en) * | 2016-01-30 | 2019-03-12 | 长春理工大学 | A kind of folding-cavity laser |
| CN107221832A (en) * | 2017-08-01 | 2017-09-29 | 南京先进激光技术研究院 | A kind of U-shaped cavity laser that can efficiently debug and its adjustment method |
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