CN103490270A - Reflection type sheet laser amplifier of ridge structure - Google Patents
Reflection type sheet laser amplifier of ridge structure Download PDFInfo
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- CN103490270A CN103490270A CN201310412974.6A CN201310412974A CN103490270A CN 103490270 A CN103490270 A CN 103490270A CN 201310412974 A CN201310412974 A CN 201310412974A CN 103490270 A CN103490270 A CN 103490270A
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- ridge structure
- gain media
- structure sheet
- sheet gain
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Abstract
The invention discloses a reflection type sheet laser amplifier of a ridge structure. The reflection type sheet laser amplifier of the ridge structure comprises a window, ridge structure sheet gain media, diode laser arrays, cushion blocks, a cooling and radiating device and a reflector, wherein m pairs of ridge structure sheet gain media are arranged on the inner walls of two cooling and radiating slabs of the cooling and radiating device in a vertically staggered mode, the two cooling and radiating slabs of the cooling and radiating device are vertically parallel to each other, m is a positive integer, the window is arranged at one ends of the cooling and radiating slabs, the reflector is arranged at the other ends of the cooling and radiating slabs, the plane where the window is located is parallel to the plane where the reflector is located, each ridge structure sheet gain medium is pumped by a corresponding diode laser array. According to the reflection type sheet laser amplifier of the ridge structure, two-pass four-time amplification of injected pulses can be achieved by the ridge structure sheet gain media without coating, low incidence loss of the surfaces of the gain media is guaranteed, and a series of problems caused by coating of the surfaces of the gain media are avoided. The reflection type sheet laser amplifier of the ridge structure has the advantages that quality of output light beams is good, and efficiency is high.
Description
Technical field
The present invention relates to a kind of laser system, be specifically related to a kind of ridge structure platelet-like reflective formula laser amplifier.
Background technology
High-Power Laser Amplifiers usually adopts multipass to amplify and slice technique improves the entire system operating efficiency.Than single-pass master-oscillator power amplifier structure (being called again the MOPA structure), the multipass amplification is conducive to improve energy extraction efficiency, thereby improves the energy conversion efficiency of system; Laminated structure makes gain media have high TEM
00filling rate, low thermal effect, be conducive to reduce thermal lensing effect and the thermic stress birfringence effect of medium, improves output beam quality.Utilize multipass to amplify and the operation principle of the High-Power Laser Amplifiers of slice technique is based on the Brewster's angle transmission-type structure of series connection of multi-disc thin slice crystal or the activation mirror structure that multi-disc thin slice crystal array formula is arranged mostly.But these two kinds of structures all have certain limitation.The Brewster's angle transmission-type structure of multi-disc crystal series connection, energy extraction efficiency is not high, and structure is not compact, and this operation mode has very high requirement to crystal cooling; The activation mirror structure at the gain media surface coating, exists the water erosion problem of rete under water cooling mode and the resisting laser damage capability problems of rete due to needs, and these all will limit its further application in High-Power Laser Amplifiers.Suitable pumping source not only can improve the system capacity transformation efficiency, obtains high output beam quality, can also effectively reduce the various thermal effects in pumping process.Adopt diode laser matrix as pumping source, energy conversion efficiency is high, beam quality is high, device architecture is compacter, not only can overcome the intrinsic electro-optical efficiency of lamp pump Solid State Laser amplification system low, the shortcomings such as heat load is higher, other negative effects such as hot depolarization that simultaneously also can effectively avoid flash lamp pumping to produce.
Summary of the invention
For above problem, in order to improve beam quality, reduce thermal effect, to improve system effectiveness, the invention provides a kind of ridge structure platelet-like reflective formula laser amplifier.In embodiments of the present invention, inject light and inject the related m(m=1 of the embodiment of the present invention with P polarization state (electric vector vibration direction is parallel to the plane of incidence), Brewster's angle, 2,3 ...M gets positive integer.) upper and lower parallel relative, staggered ridge structure sheet gain media is amplified.The present invention can be applied in various other laser amplifier structures and laser system.
Technical solution of the present invention is as follows:
A kind of ridge structure platelet-like reflective formula laser amplifier, its characteristics are: comprise window, ridge structure sheet gain media, diode laser matrix, cushion block, cooling heat radiator and speculum, at the inwall of two cooling heat dissipation flat boards that are parallel to each other up and down of the described cooling heat radiator staggered m(m=1 that arranges abreast up and down, 2,3 ...M gets positive integer.) to ridge structure sheet gain media, wherein the value of m is positive integer, an end at described cooling heat dissipation flat board arranges described window, the other end arranges described speculum, between described window and described cooling heat dissipation flat board and between described speculum and described cooling heat dissipation flat board, by described cushion block, fixing, the plane of described window plane and described speculum is parallel to each other, angle between described window plane and described cooling heat dissipation flat board is α, α=tan
-1n, the ridge angle of described ridge structure sheet gain media is β: β={ π+2[(sin (tan
-1n))/n-sin
-1(1/n)] }, the linear refractive index that wherein n is sheet ridge structure gain media, adopt described diode laser matrix to carry out pumping to each piece ridge structure sheet gain media.
Longitudinal pitch between adjacent two ridge structure sheet gain medias that staggered opposing parallel is arranged up and down of described ridge structure sheet gain media determines by injecting beam size.
The right side edge of the left side edge of described ridge structure sheet gain media or right side edge and its another sheet ridge structure sheet gain media of relatively arranging of being staggered or the abscissa of left side edge position are identical.
Described diode laser matrix carries out end pumping or profile pump to described ridge structure sheet gain media.
Described speculum is level crossing, concave mirror or distorting lens.
A kind of ridge structure platelet-like reflective formula laser amplifier system comprises: window, window is positioned to receive along the P polarization input light of window side normal direction incident and along the ridge structure sheet gain media that light path guiding light beam injects, round trip is passed through by embodiment of the present invention arrangement mode for four times of arranging, finally output.This amplifier system also comprises multi-disc ridge structure sheet gain media, this m(m=1, and 2,3 ...M gets positive integer.) to ridge structure sheet gain media staggered parallel arrangement up and down, and a left side (right side) lateral edges of every ridge structure sheet gain media is identical with the abscissa (along horizontal direction in figure) of its lateral edges position, the right side (left side) of another sheet ridge structure sheet gain media of arrangement relatively of being staggered.The ridge structure of sheet gain media is characterised in that to have specific size and angle requirement, make the P polarization input light that injects from window with brewster angle incidence to this sheet ridge structure gain media side ridge the time, also meet the condition of experiences total internal reflection on the base, inside of ridge structure simultaneously.Longitudinal pitch between adjacent two ridge structure sheet gain medias of staggered parallel arrangement determines by injecting beam size up and down.This amplifier system also comprises a plurality of diode laser matrixs, and a plurality of diode laser matrixs are arranged and provided pumping for ridge structure sheet gain media according to the structure of end face and profile pump respectively.This amplifier system also comprises that this cooling device is arranged by described optical path for ridge structure sheet gain media and laser diode being provided to the device of cooling heat dissipation.This amplifier system also comprises speculum, and speculum is along described light path arrangement, and on vertical reflection, half way passes through m(m=1,2,3 ...M gets positive integer.) to the injection light of the ridge structure sheet gain media of staggered parallel arrangement up and down.This speculum can be concave mirror, distorting lens etc.This amplifier system also comprises cushion block, and cushion block, along described light path arrangement, is used for supporting being fixed in m(m=1,2,3 ...M gets positive integer.) to two ridge structure sheet gain medias of outermost of staggered parallel arrangement up and down.According to another embodiment of the present invention, provide a kind of method of amplifying injected pulse.The method comprises: input pulse injects along the face normal direction of the window that is positioned to become with horizontal plane certain special angle with the P polarization state, then with brewster angle incidence, from a side ridge of ridge structure sheet gain media, enter, once by after amplifying, emission in the bottom of this gain media is complete, again by this ridge structure sheet gain media and amplified by secondary, from the opposite side ridge outgoing of this gain media, be incident to successively and its ridge structure sheet gain media staggered relatively that interlocks up and down, so circulation until when light beam with Brewster's angle from the outgoing of last a slice ridge structure sheet gain media, realized that the first Cheng Shuantong amplifies, then by after the mirror reflects of specific angle orientation, reverse successively again by each sheet ridge structure sheet gain media along injecting light the first journey light path coaxial, thereby four amplifications of round trip have been realized, finally from window, export.
M(m=1 proposed by the invention, 2,3 ...M gets positive integer.) the ridge structure platelet-like reflective formula laser amplifier structure of the parallel arrangement that interlocks has up and down been realized to four amplifications of the round trip of injected pulse in gain media, with the Brewster's angle transmission-type structure that traditional multi-disc crystal is connected, compare, in the situation that guarantee to extract energy same four times, the quadruple pass light path is reduced to two journeys, fully extract energy storage, improved energy extraction efficiency; Structure is compacter, has greatly dwindled the volume of whole bundle group, is conducive to integrated and modularization.With activation mirror type structure, compare, ridge structure sheet gain media proposed by the invention can be realized four amplifications of round trip of injected pulse without plated film, guaranteed the low incident loss on gain media surface, avoided the existing series of problems of gain media surface coating, for example the water erosion problem of rete under water cooling mode and the resisting laser damage capability problems of rete, simultaneously ridge structure sheet gain media up and down staggered arrangement mode can reduce the non-linear light beam in amplification process, improve output beam quality.The method of the invention and system can be applied in various other laser amplifier structures and laser system.
The accompanying drawing explanation
Figure 1A is ridge structure platelet-like reflective formula laser amplifier embodiment 1(diode laser matrix end pumping of the present invention) 3-D view;
Figure 1B is the schematic three-dimensional top view according to the light path of the ridge structure platelet-like reflective formula laser amplifier of the diode laser matrix end pumping of the embodiment of the present invention;
Fig. 2 A is ridge structure platelet-like reflective formula laser amplifier embodiment 2(diode laser matrix profile pump of the present invention) 3-D view;
Fig. 2 B is the embodiment of the present invention 2 vertical views;
Fig. 3 is the m(m=1 of the embodiment of the present invention, 2,3 ...M gets positive integer.Get m=2 herein, take two pairs four be example.) position relationship between the ridge structure sheet gain media of staggered parallel arrangement and the three-dimensional top view of window and reflector position up and down;
Fig. 4 A is the 3-D view according to the single ridge structure sheet gain media of the embodiment of the present invention;
Fig. 4 B is the three-dimensional front view according to the single ridge structure sheet gain media of the embodiment of the present invention;
Fig. 4 C is the three-dimensional top view according to the single ridge structure sheet gain media of the embodiment of the present invention;
Fig. 4 D is the 3-D view according to the opticpath that passes through single ridge structure sheet gain media of the embodiment of the present invention;
Fig. 4 E is the three-dimensional front view according to the opticpath that passes through single ridge structure sheet gain media of the embodiment of the present invention;
In figure, 1. bound edge 3. cushion block 4. cooling heat radiator 5. diode laser matrix 6. window 7. speculums of ridge structure sheet gain media 2. ridge structure sheet gain medias
Embodiment
First refer to Fig. 1,
The present invention relates to a kind of laser system, be specifically related to a kind of ridge structure platelet-like reflective formula laser amplifier structure and pulse amplification method.In embodiments of the present invention, the light that need be exaggerated injects the related m(m=1 of the embodiment of the present invention with P polarization state (electric vector vibration direction is parallel to the plane of incidence), Brewster's angle, and 2,3 ...M gets positive integer.) the ridge structure sheet gain media of the parallel arrangement that interlocks is up and down amplified.Described method and system can be applied in various other laser amplifier structures and laser system.
Figure 1A is the 3-D view according to the simplification of the ridge structure platelet-like reflective formula laser amplifier of the embodiment of the present invention.The ridge structure platelet-like reflective formula laser amplifier of the embodiment of the present invention uses multi-disc ridge structure sheet gain media usually, and for convenience of description, the ridge structure sheet gain media in Figure 1A and every other figure described here all be take 4 as example.
Figure 1B utilizes diode laser matrix to carry out the schematic three-dimensional top view of opticpath of the ridge structure platelet-like reflective formula laser amplifier of end pumping according to the embodiment of the present invention, as shown in the figure, diode laser matrix 5 is placed along the direction identical with amplifying light beam ridge structure sheet gain media 1 is carried out to end pumping by described light path.Injected pulse is injected and enters from a side ridge of ridge structure sheet gain media with brewster angle incidence along the face normal direction of the window 6 with the specific angle orientation with the P polarization state, once by after amplifying, emission in the bottom of this gain media is complete, again by this ridge structure sheet gain media and amplified by secondary, from the opposite side ridge outgoing of this gain media, be incident to successively and its ridge structure sheet gain media staggered relatively that interlocks up and down, so circulation until when light beam with Brewster's angle from the outgoing of last a slice ridge structure sheet gain media, then by after the mirror reflects of specific angle orientation, reverse successively again by remaining each sheet ridge structure sheet gain media along the light path coaxial that injects light the first journey, thereby four amplifications of round trip have been realized, finally by window, lead the ejaculation amplifier system.
Fig. 2 A carries out the 3-D view of simplification of the ridge structure platelet-like reflective formula laser amplifier of profile pump according to the diode laser matrix that utilizes of the embodiment of the present invention.Fig. 2 B carries out the schematic three-dimensional top view of simplification of the ridge structure platelet-like reflective formula laser amplifier of profile pump according to the diode laser matrix that utilizes of the embodiment of the present invention.In the embodiment of Fig. 2 B explanation, diode laser matrix 5 is placed along the direction vertical with amplifying light beam ridge structure sheet gain media is carried out to profile pump by described light path.Inject the light path that light path in the present embodiment of light and embodiment of the present invention Figure 1B inject light identical.
Fig. 3 is the m(m=1 according to the embodiment of the present invention, 2,3 ...M gets positive integer.Get m=2 herein, take two pairs four be example) to the position relationship between the ridge structure sheet gain media of staggered parallel arrangement up and down and the three-dimensional top view of window and reflector position.In the embodiment of Fig. 3 explanation, the interlaced parallel placement of each sheet ridge structure sheet gain media, and a left side (right side) lateral edges of every ridge structure sheet gain media is identical with the abscissa (along horizontal direction in figure) of the lateral edges position, the right side (left side) of its relative another sheet ridge structure sheet gain media of arranging that is staggered.In the embodiment of Fig. 3 explanation, window 6 and speculum 7 are α, wherein α=tan with the angle of cushion block 3 respectively
-1n, the linear refractive index that n is sheet ridge structure gain media 1.
Fig. 4 A is the 3-D view according to the single ridge structure sheet gain media of the embodiment of the present invention.Fig. 4 B is the three-dimensional front view according to the single ridge structure sheet gain media of the embodiment of the present invention.Fig. 4 C is the three-dimensional top view according to the single ridge structure sheet gain media of the embodiment of the present invention; The both sides of edges of ridge structure sheet gain media 1 has bound edge 2, the both sides of edges of ridge structure sheet gain media 1 is made to mill simultaneously and tiltedly processes, and is used for decrease uptake parasitic oscillation and amplified spont-aneous emission.The mill rake angle has different values in some specific application examples, and for example, in embodiments of the present invention, the mill rake angle is approximately 1.5 °.
Fig. 4 D is the 3-D view according to the opticpath that passes through single ridge structure sheet gain media of the embodiment of the present invention;
Fig. 4 E is the three-dimensional front view according to the opticpath that passes through ridge structure sheet gain media of the embodiment of the present invention.The input light injected by window 6 is with a side ridge of Brewster's angle α angle incident ridge structure sheet gain media 1, then on the base of gain media 1, with alinternal reflection angle β, reflect, finally, from the ridge opposite side of gain media 1 with Brewster's angle α outgoing.Ridge structure is characterised in that to have specific size and angle requirement, except will meet the requirement that incident beam aperture and light beam transversal move on optical path direction, also need to meet along the incident of window side normal direction and with brewster angle incidence to the side ridge of this sheet ridge structure gain media and on the base, inside of ridge structure experiences total internal reflection.
Inject the linear refractive index n decision of the brewster angle incidence angle α of light by ridge structure sheet gain media 1 material:
α=tan
-1n
Inject the linear refractive index n decision of the alinternal reflection angle β of light on ridge structure sheet gain media 1 bottom by ridge structure sheet gain media 1 material:
β=sin
-1(1/n)
2γ=π＋2[(sin(tan
-1n))/n－sin
-1(1/n)]。
Claims (5)
1. a ridge structure platelet-like reflective formula laser amplifier, it is characterized in that: comprise window (6), a plurality of ridge structure sheet gain medias (1), a plurality of diode laser matrixs (5), cushion block (3), cooling heat radiator, speculum (7), the inwall of the cooling heat dissipations that are parallel to each other up and down two of described cooling heat radiator dull and stereotyped (4) arranges m up and down alternately to ridge structure sheet gain media (1), wherein the value of m is positive integer, an end at described cooling heat dissipation dull and stereotyped (4) arranges described window (6), the other end arranges described speculum (7), ridge structure sheet gain media (1) in dull and stereotyped (4) outermost end of described cooling heat dissipation is fixing by described cushion block (3), the plane of described window (6) plane and described speculum (7) is parallel to each other, angle between described window (6) plane and described cooling heat dissipation dull and stereotyped (4) is α: α=tan
-1n, the ridge angle of described ridge structure sheet gain media (1) is β: β={ π+2[(sin (tan
-1n))/n-sin
-1(1/n)] }, the linear refractive index that wherein n is sheet ridge structure gain media (1), adopt described diode laser matrix (5) to carry out pumping to each piece ridge structure sheet gain media (1).
2. ridge structure platelet-like reflective formula laser amplifier according to claim 1 is characterized in that: the longitudinal pitch between adjacent two ridge structure sheet gain medias that staggered opposing parallel is arranged up and down of described ridge structure sheet gain media (1) determines by injecting beam size.
3. ridge structure platelet-like reflective formula laser amplifier according to claim 1 is characterized in that: the right side edge of the left side edge of described ridge structure sheet gain media (1) or right side edge and its another sheet ridge structure sheet gain media of relatively arranging of being staggered or the abscissa of left side edge position are identical.
4. ridge structure platelet-like reflective formula laser amplifier according to claim 1, it is characterized in that: described diode laser matrix (5) carries out end pumping or profile pump to described ridge structure sheet gain media (1).
5. according to the described ridge structure platelet-like reflective of claim 1 to 4 any one formula laser amplifier, it is characterized in that: described speculum (7) is level crossing, concave mirror or distorting lens.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310412974.6A CN103490270B (en) | 2013-09-11 | 2013-09-11 | Reflection type sheet laser amplifier of ridge structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310412974.6A CN103490270B (en) | 2013-09-11 | 2013-09-11 | Reflection type sheet laser amplifier of ridge structure |
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| Publication Number | Publication Date |
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| CN103490270A true CN103490270A (en) | 2014-01-01 |
| CN103490270B CN103490270B (en) | 2015-12-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113258418A (en) * | 2021-07-16 | 2021-08-13 | 四川光天下激光科技有限公司 | Laser amplification system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61134088A (en) * | 1984-12-04 | 1986-06-21 | Nec Corp | Total reflection type prism amplifier |
| CN1039332A (en) * | 1988-07-12 | 1990-01-31 | 加利福尼亚实验室有限公司 | Multiply folded laser system |
| US7894496B2 (en) * | 2004-05-11 | 2011-02-22 | Lawrence Livermore National Security, Llc | Gain media edge treatment to suppress amplified spontaneous emission in a high power laser |
| EP2475054A1 (en) * | 2011-01-05 | 2012-07-11 | UAB "Ekspla" | Collinearly pumped multiple thin disk active medium and its pumping scheme |
| CN203150893U (en) * | 2013-01-16 | 2013-08-21 | 北京工业大学 | Multi-way slab laser amplifier |
-
2013
- 2013-09-11 CN CN201310412974.6A patent/CN103490270B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61134088A (en) * | 1984-12-04 | 1986-06-21 | Nec Corp | Total reflection type prism amplifier |
| CN1039332A (en) * | 1988-07-12 | 1990-01-31 | 加利福尼亚实验室有限公司 | Multiply folded laser system |
| US7894496B2 (en) * | 2004-05-11 | 2011-02-22 | Lawrence Livermore National Security, Llc | Gain media edge treatment to suppress amplified spontaneous emission in a high power laser |
| EP2475054A1 (en) * | 2011-01-05 | 2012-07-11 | UAB "Ekspla" | Collinearly pumped multiple thin disk active medium and its pumping scheme |
| CN203150893U (en) * | 2013-01-16 | 2013-08-21 | 北京工业大学 | Multi-way slab laser amplifier |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113258418A (en) * | 2021-07-16 | 2021-08-13 | 四川光天下激光科技有限公司 | Laser amplification system |
| CN113258418B (en) * | 2021-07-16 | 2021-12-21 | 四川光天下激光科技有限公司 | Laser amplification system |
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| Publication number | Publication date |
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| CN103490270B (en) | 2015-12-23 |
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Granted publication date: 20151223 Termination date: 20180911 |