CN102681197A - Spatial filter and laser amplification device adopting same - Google Patents
Spatial filter and laser amplification device adopting same Download PDFInfo
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- CN102681197A CN102681197A CN2012101585846A CN201210158584A CN102681197A CN 102681197 A CN102681197 A CN 102681197A CN 2012101585846 A CN2012101585846 A CN 2012101585846A CN 201210158584 A CN201210158584 A CN 201210158584A CN 102681197 A CN102681197 A CN 102681197A
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Abstract
The invention provides a spatial filter, which comprises a first window sheet and a second window sheet along a longitudinal axis, wherein a laser beam is incident into the first window sheet and transmitted from the second window sheet so as to get out of the spatial filter; and at least one of the first window sheet and the second window sheet is perpendicular to the longitudinal axis. The invention also provides a laser amplification device with the spatial filter.
Description
Technical field
The invention belongs to optical field, relate in particular to a kind of spatial filter and adopt laser amplification device, especially the high-gain multi-pass laser amplification device of this spatial filter.
Background technology
For multi-pass laser amplification device, comprise spatial filter, laser amplifier and catoptron as the one of which.It among Fig. 1 the synoptic diagram of the light path in the prior art laser amplification device.In the high energy laser system, spatial filter is one of wherein crucial technical unit, and its optical texture is fairly simple, forms by a pair of confocal positive lens with at an aperture at public focus place.Spatial filter is being born the high frequency modulated of eliminating in the laser beam, suppresses the Small-scale Self-focusing effect in the follow-up main amplifier, light beam is looked like transmitting of task.Realize picture transmission through spatial filter, can reduce diffraction effect, thereby improve beam quality.In addition, spatial filter also is used to the expanded light beam bore, and the energy density of the laser beam that energy is uprised step by step is controlled under the optical destructive threshold value.Simultaneously, the aperture of spatial filter also has certain light isolating power, helps suppressing self-sustained oscillation and reverse laser beam.
Diaphragm is by placement shown in Figure 1 in traditional spatial filter; The axis normal of diaphragm and spatial filter; The shortcoming of placing like this is because the transmissivity of diaphragm can not reach 100%, always to have some remaining reflections; When incoming laser beam during along the axis propagation of spatial filter; Two diaphragms of spatial filter respectively with laser amplifier after catoptron form resonator cavity, laser beam comes back reflective, generation self-sustained oscillation between the diaphragm of spatial filter and the catoptron behind the laser amplifier.
In the high-gain multi-pass laser amplification device, self-sustained oscillation has consumed a large amount of counter-rotating particles, when laser once more when the laser medium, inverted population can occur in the laser medium and tail off and not enough situation occurs gaining.Because self-oscillatory appearance; The unwanted laser of script that will occur macro-energy in this laser amplification device; This can bring crushing damage to some optical device of laser amplification device and place system, may make whole laser amplification device receive crushing damage.Especially to the multi-pass laser amplification system of high-gain, the infringement that this phenomenon is brought is bigger, makes that this laser amplification device reliability is lower.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of spatial filter, can eliminate the self-sustained oscillation in the laser amplification device at spatial filter place.
The present invention provides a kind of spatial filter; Extend along the longitudinal axis; It has first diaphragm and second diaphragm, and laser beam transmits spatial filter from the first diaphragm incident and from second diaphragm, and wherein one of at least the first diaphragm and second diaphragm are non-perpendicular with the said longitudinal axis.
According to spatial filter provided by the invention, wherein first diaphragm and second diaphragm are all non-perpendicular with the said longitudinal axis.
According to spatial filter provided by the invention, wherein the normal of the normal of first diaphragm and second diaphragm is in same plane.
According to spatial filter provided by the invention, wherein the normal of the normal of first diaphragm and second diaphragm is in different plane.
According to spatial filter provided by the invention, wherein the normal of first diaphragm tilts to different directions with the normal of second diaphragm.
According to spatial filter provided by the invention, wherein the normal of first diaphragm tilts to identical direction with the normal of second diaphragm.
According to spatial filter provided by the invention, wherein the reflection lasering beam that is set to make the residual reflection of first or second diaphragm to form of the angle between the angle between first diaphragm and the said longitudinal axis and second diaphragm and the said longitudinal axis can not incide on another diaphragm.
According to spatial filter provided by the invention; Wherein the angle theta between first diaphragm and the said longitudinal axis satisfies tan2 θ >=d/l; Perhaps the angle between second diaphragm and the said longitudinal axis satisfies tan2 α >=d/l; Perhaps satisfy tan2 θ >=d/l, tan2 α >=d/l simultaneously, wherein l is the length of spatial filter, and d is the bore of spatial filter.
The present invention also provides a kind of laser amplification device with above-mentioned spatial filter.
The present invention has adopted non-perpendicular diaphragm in spatial filter, can avoid the self-oscillatory formation of laser effectively, and processing ease, very easily realizes.
Description of drawings
Followingly the embodiment of the invention is described further with reference to accompanying drawing, wherein:
Fig. 1 is the structural representation of laser amplification device of the prior art;
Fig. 2 is the structural representation according to the spatial filter of embodiments of the invention 1;
Fig. 3 is the structural representation according to the spatial filter of embodiments of the invention 2;
Fig. 4 is the structural representation according to the spatial filter of embodiments of the invention 3;
Fig. 5 is the structural representation according to the spatial filter of embodiments of the invention 4;
Fig. 6 is the structural representation according to the spatial filter of embodiments of the invention 5;
Fig. 7 is the structural representation of spatial filter according to still another embodiment of the invention.
Embodiment
Present embodiment provides a kind of spatial filter 1; Its structure is as shown in Figure 2; This spatial filter 1 be along longitudinal axis A extend bar-shaped, it has diaphragm S1 (incidence window sheet) and S2 (outgoing diaphragm), wherein diaphragm S1 is perpendicular to longitudinal axis A; The normal that is diaphragm S1 is parallel with longitudinal axis A; And diaphragm S2 and longitudinal axis A are non-perpendicular, and promptly the normal N of diaphragm S2 and longitudinal axis A are an angle theta (0 °＜θ＜90 °), wherein the schematic cross-section that obtains for this spatial filter 1 of plane cutting along the normal N of diaphragm S2 and longitudinal axis A place of this Fig. 2.
From Fig. 2, can know; When incoming laser beam L perpendicular to diaphragm S1 incide in the spatial filter after, incoming laser beam L propagates and penetrates from diaphragm S2 along longitudinal axis A direction, incides at last on the catoptron R vertical with longitudinal axis A; Before inciding catoptron R; Also that kind shown in the image pattern 1 has been passed through laser crystal, because laser crystal does not change the direction of laser beam, therefore in Fig. 2, has omitted laser amplifier for clarity.Incoming laser beam L becomes reflection lasering beam Lr1 after the mirror R reflection that is reflected; Reflection lasering beam Lr1 returns and incides in former road on the diaphragm S2; Owing to the residual reflection of diaphragm S2 forms reflection lasering beam Lr2; Because have angle theta between the normal N of diaphragm S2 and the longitudinal axis A, so have angle 2 θ between reflection lasering beam Lr2 and the reflection lasering beam Lr1, and be not that former road is returned; Therefore can vibration back and forth between the outgoing diaphragm of spatial filter 1 and catoptron, thus the self-oscillatory formation of laser avoided effectively.
Present embodiment provides a kind of spatial filter 2; Its structure is as shown in Figure 3; This spatial filter 2 be along longitudinal axis A extend bar-shaped, it has diaphragm S1 (incidence window sheet) and S2 (outgoing diaphragm), wherein diaphragm S2 is perpendicular to longitudinal axis A; The normal that is diaphragm S2 is parallel with longitudinal axis A; And diaphragm S1 and longitudinal axis A are non-perpendicular, and promptly the normal N of diaphragm S1 and longitudinal axis A are an angle theta (0 °＜θ＜90 °), wherein the schematic cross-section that obtains for this spatial filter 2 of plane cutting along the normal N of diaphragm S1 and longitudinal axis A place of this Fig. 3.
From Fig. 3, can know; After incoming laser beam L incided in the spatial filter with being parallel to longitudinal axis A, incoming laser beam L propagated and penetrates from diaphragm S2 along longitudinal axis A direction, incides at last on the catoptron R vertical with longitudinal axis A; Before inciding catoptron R; Also that kind shown in the image pattern 1 has been passed through laser crystal, because laser crystal does not change the direction of laser beam, therefore in Fig. 3, has omitted laser amplifier for clarity.Incoming laser beam L becomes reflection lasering beam Lr1 after the mirror R reflection that is reflected; Reflection lasering beam Lr1 returns on former road and incides on the diaphragm S1 through diaphragm S2; Owing to the residual reflection of diaphragm S1 forms reflection lasering beam Lr2; Because have angle theta between the normal N of diaphragm S1 and the longitudinal axis A, so have angle 2 θ between reflection lasering beam Lr2 and the reflection lasering beam Lr1, and be not that former road is returned; Therefore can vibration back and forth between the incidence window sheet of spatial filter 1 and catoptron, thus the self-oscillatory formation of laser avoided effectively.
Present embodiment provides a kind of spatial filter 3; Its structure is as shown in Figure 4; This spatial filter 3 be along longitudinal axis A extend bar-shaped, it has diaphragm S1 (incidence window sheet) and S2 (outgoing diaphragm), wherein diaphragm S1 and S1 are all non-perpendicular with longitudinal axis A; Normal N 1 and the longitudinal axis A of diaphragm S1 are an angle theta (0 °＜θ＜90 °); The normal N 2 of diaphragm S2 is an angle (0 °＜α＜90 °) with longitudinal axis A, wherein the normal N 2 of the normal N 1 of diaphragm S1, diaphragm S2 at grade, the schematic cross-section that obtains for this spatial filter 3 of plane cutting of this Fig. 4 wherein along normal N 1, normal N 2, longitudinal axis A place.
From Fig. 4, can know; After incoming laser beam L incided in the spatial filter with being parallel to longitudinal axis A, incoming laser beam L propagated and penetrates from diaphragm S2 along longitudinal axis A direction, incides at last on the catoptron R vertical with longitudinal axis A; Before inciding catoptron R; Also that kind shown in the image pattern 1 has been passed through laser crystal, because laser crystal does not change the direction of laser beam, therefore in Fig. 4, has omitted laser amplifier for clarity.Incoming laser beam L becomes reflection lasering beam Lr1 after the mirror R reflection that is reflected; Reflection lasering beam Lr1 returns on former road and sees through diaphragm S2 and diaphragm S1 successively, in this process owing to the residual reflection of diaphragm S2 form reflection lasering beam Lr2, owing to the residual reflection of diaphragm S1 forms reflection lasering beam Lr3.Because have angle between the normal N 2 of diaphragm S2 and the longitudinal axis A; Therefore have angle 2 α between reflection lasering beam Lr2 and the reflection lasering beam Lr1; And be not that former road is returned; Therefore can vibration back and forth between the outgoing diaphragm S2 of spatial filter 1 and catoptron, thus the self-oscillatory formation of laser avoided effectively.Likewise; Because have angle theta between the normal N 1 of diaphragm S1 and the longitudinal axis A; Therefore have angle 2 θ between reflection lasering beam Lr2 and the reflection lasering beam Lr1; And be not that former road is returned, therefore can vibration back and forth between the incidence window sheet S1 of spatial filter 1 and catoptron yet, thus the self-oscillatory formation of laser avoided effectively.
According to other embodiments of the invention, wherein the angle theta between the normal N 1 of diaphragm S1 and the longitudinal axis A and the normal N 2 of diaphragm S2 can equate with angle between the longitudinal axis A, also can be unequal.
Present embodiment provides a kind of spatial filter 4; Its structure is as shown in Figure 5; This spatial filter 4 be along longitudinal axis A extend bar-shaped, it has diaphragm S1 (incidence window sheet) and S2 (outgoing diaphragm), wherein diaphragm S1 and S1 are all non-perpendicular with longitudinal axis A; Normal N 1 and the longitudinal axis A of diaphragm S1 are an angle theta (0 °＜θ＜90 °); The normal N 2 of diaphragm S2 is an angle (0 °＜α＜90 °) with longitudinal axis A, is that with the difference of spatial filter among the embodiment 3 vergence direction of diaphragm S1 and diaphragm S2 is identical, and wherein the normal N 2 of the normal N 1 of diaphragm S1, diaphragm S2 at grade; Wherein this Fig. 5 is parallelogram for the schematic cross-section that this spatial filter 4 of plane cutting along normal N 1, normal N 2, longitudinal axis A place obtains.
From Fig. 5, can know; After incoming laser beam L incided in the spatial filter with being parallel to longitudinal axis A, incoming laser beam L propagated and penetrates from diaphragm S2 along longitudinal axis A direction, incides at last on the catoptron R vertical with longitudinal axis A; Before inciding catoptron R; Also that kind shown in the image pattern 1 has been passed through laser crystal, because laser crystal does not change the direction of laser beam, therefore in Fig. 5, has omitted laser amplifier for clarity.Incoming laser beam L becomes reflection lasering beam Lr1 after the mirror R reflection that is reflected; Reflection lasering beam Lr1 returns on former road and sees through diaphragm S2 and diaphragm S1 successively, in this process owing to the residual reflection of diaphragm S2 form reflection lasering beam Lr2, owing to the residual reflection of diaphragm S1 forms reflection lasering beam Lr3.Because have angle between the normal N 2 of diaphragm S2 and the longitudinal axis A; Therefore have angle 2 α between reflection lasering beam Lr2 and the reflection lasering beam Lr1; And be not that former road is returned; Therefore can vibration back and forth between the outgoing diaphragm S2 of spatial filter 1 and catoptron, thus the self-oscillatory formation of laser avoided effectively.Likewise; Because have angle theta between the normal N 1 of diaphragm S1 and the longitudinal axis A; Therefore have angle 2 θ between reflection lasering beam Lr2 and the reflection lasering beam Lr1; And be not that former road is returned, therefore can vibration back and forth between the incidence window sheet S1 of spatial filter 1 and catoptron yet, thus the self-oscillatory formation of laser avoided effectively.
According to other embodiments of the invention, wherein the angle theta between the normal N 1 of diaphragm S1 and the longitudinal axis A and the normal N 2 of diaphragm S2 can equate with angle between the longitudinal axis A, also can be unequal.
In the above-described embodiments, several kinds of different diaphragm inclination modes are provided, all can have avoided the self-oscillatory formation of laser effectively.But when the angle of inclination of incidence window sheet hour; The reflection lasering beam that forms owing to the residual reflection of incidence window sheet may incide on the outgoing diaphragm; If at this moment the angle of inclination of outgoing diaphragm is also less, the then residual reflection of outgoing diaphragm and the reflection lasering beam that forms also maybe can incide on the outgoing diaphragm, this repeatedly reflection between the diaphragm is not that former road is returned; Therefore self-sustained oscillation can not take place; However, in practical application, still be preferably reflection lasering beam less as far as possible number of times ground in spatial filter is reflected by diaphragm.
Present embodiment provides a kind of spatial filter 5; Through the angle of inclination of restriction incidence window sheet, the reflection lasering beam of the residual reflection formation of incidence window sheet can not incided on the outgoing diaphragm, the structure of the spatial filter among its structure and the embodiment 2 is roughly the same; As shown in Figure 6; This spatial filter 5 be along longitudinal axis A extend bar-shaped, it has diaphragm S1 (incidence window sheet) and S2 (outgoing diaphragm), wherein diaphragm S2 is perpendicular to longitudinal axis A; The normal that is diaphragm S2 is parallel with longitudinal axis A; And diaphragm S1 and longitudinal axis A are non-perpendicular, and promptly the normal N of diaphragm S1 and longitudinal axis A are an angle theta (0 °＜θ＜90 °), wherein the schematic cross-section that obtains for this spatial filter 5 of plane cutting along the normal N of diaphragm S1 and longitudinal axis A place of this Fig. 6.
Comparatively speaking; When incoming laser beam is propagated on the less one side of the length of pressing close to spatial filter; The reflection lasering beam Lr2 of diaphragm S1 reflection is incided on the diaphragm S1; Therefore as shown in Figure 6, the incoming laser beam L that propagates with the less one side of the length of pressing close to spatial filter is that example explanation can guarantee that reflection lasering beam Lr2 can not incide the boundary condition on the diaphragm S1.
As shown in Figure 6, can guarantee that the boundary condition that reflection lasering beam Lr2 can not incide on the diaphragm S1 is:
l’≤l，
Wherein l is the length than minor face of spatial filter, and l ' is the length of the projection of reflection lasering beam Lr on the y direction of spatial filter, and hence one can see that, and when l '≤l, reflection lasering beam Lr2 can not incide on the diaphragm S1.
L '=d '/tan2 θ wherein, propagate on less one side because incoming laser beam L presses close to the length of spatial filter, so d ' ≈ d (d is the bore of spatial filter), l ' ≈ d/tan2 θ thus.
Can release d/tan2 θ≤l thus
Therefore, tan2 θ >=d/l.
Wherein because spatial filter is bar-shaped; Its length is usually much larger than its bore; Therefore can think spatial filter along the longer sides of longitudinal axis A and equal basically than the length of minor face, be referred to as the length of spatial filter, therefore available l represents the length of spatial filter.
Likewise, for the spatial filter among the foregoing description 3 and the embodiment 4, also can utilize formula tan2 θ >=d/l to calculate to send as an envoy to reflection lasering beam Lr2 can not incide the approximate range of the θ value on the diaphragm S1.
For the spatial filter in the foregoing description 1; The reflection lasering beam that the residual reflection that also can utilize formula tan2 θ >=d/l to calculate the diaphragm S1 that sends as an envoy to forms only passes through the primary event of diaphragm S2, can not reenter the approximate range of the θ value that is mapped on the diaphragm S1 afterwards.
For the spatial filter of other shapes, those skilled in the art can easily derive send as an envoy to reflection lasering beam in spatial filter less as far as possible number of times ground by the approximate range of the θ value of diaphragm reflection.
According to other embodiments of the invention, its spatial filter is not limited to bar-shaped, also can be other strips, and for example the cross section is the strip of rectangle, ellipse etc.
According to other embodiments of the invention; The normal of two diaphragms of its spatial filter can be positioned at same plane as above-mentioned embodiment; Also can be positioned at different plane; That kind for example as shown in Figure 7, a diaphragm tilts at above-below direction, and another diaphragm tilts to left and right direction.
In a preferred embodiment, the normal that makes one of incidence window sheet and outgoing diaphragm is designed to respect to the angle θ of the vertical axis tilt of strip spatial filter, and reflection lasering beam less as far as possible number of times ground in spatial filter is reflected by diaphragm.
In more preferred embodiment, the normal that makes one of incidence window sheet and outgoing diaphragm is designed to respect to the angle θ of the vertical axis tilt of strip spatial filter, and θ satisfies tan2 θ >=d/l.
In the foregoing description, it will be appreciated by persons skilled in the art that in practical application, can select the normal of diaphragm and the angle of inclination between the spatial filter longitudinal axis between 0 to 90 ° as required.
It should be noted last that above embodiment is only unrestricted in order to technical scheme of the present invention to be described.Although the present invention is specified with reference to embodiment; Those of ordinary skill in the art is to be understood that; Technical scheme of the present invention is made amendment or is equal to replacement, do not break away from the spirit and the scope of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (9)
1. spatial filter; Extend along the longitudinal axis; It has first diaphragm and second diaphragm, and laser beam transmits spatial filter from the first diaphragm incident and from second diaphragm, and wherein one of at least the first diaphragm and second diaphragm are non-perpendicular with the said longitudinal axis.
2. spatial filter according to claim 1, wherein first diaphragm and second diaphragm are all non-perpendicular with the said longitudinal axis.
3. spatial filter according to claim 2, wherein the normal of the normal of first diaphragm and second diaphragm is in same plane.
4. spatial filter according to claim 2, wherein the normal of the normal of first diaphragm and second diaphragm is in different plane.
5. spatial filter according to claim 3, wherein the normal of first diaphragm tilts to different directions with the normal of second diaphragm.
6. spatial filter according to claim 3, wherein the normal of first diaphragm tilts to identical direction with the normal of second diaphragm.
7. spatial filter according to claim 1, wherein the reflection lasering beam that is set to make the residual reflection of first or second diaphragm to form of the angle between the angle between first diaphragm and the said longitudinal axis and second diaphragm and the said longitudinal axis can not incide on another diaphragm.
8. spatial filter according to claim 1; Wherein the angle theta between first diaphragm and the said longitudinal axis satisfies tan2 θ >=d/l; Perhaps the angle between second diaphragm and the said longitudinal axis satisfies tan2 α >=d/l; Perhaps satisfy tan2 θ >=d/l, tan2 α >=d/l simultaneously, wherein l is the length of spatial filter, and d is the bore of spatial filter.
9. laser amplification device that has according to the described spatial filter of claim 1-8.
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| CN2012101585846A CN102681197A (en) | 2012-05-21 | 2012-05-21 | Spatial filter and laser amplification device adopting same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113390342A (en) * | 2021-06-21 | 2021-09-14 | 中国工程物理研究院激光聚变研究中心 | Method for judging position of damage point of multi-pass amplification laser system |
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| JPH06268290A (en) * | 1993-03-10 | 1994-09-22 | Univ Osaka | Slab-type solid-state laser medium |
| US20050147134A1 (en) * | 2003-12-31 | 2005-07-07 | Intel Corporation | Wavelength reference filter |
| US20080165821A1 (en) * | 2004-10-29 | 2008-07-10 | Volker Raab | Laser resonator comprising an internal beam splitter |
| CN201663343U (en) * | 2010-02-05 | 2010-12-01 | 北京工业大学 | Phase conjugate mirror applied to solid-state slab laser |
| CN102236174A (en) * | 2010-04-28 | 2011-11-09 | 北京国科世纪激光技术有限公司 | Spatial filtering system |
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2012
- 2012-05-21 CN CN2012101585846A patent/CN102681197A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06268290A (en) * | 1993-03-10 | 1994-09-22 | Univ Osaka | Slab-type solid-state laser medium |
| US20050147134A1 (en) * | 2003-12-31 | 2005-07-07 | Intel Corporation | Wavelength reference filter |
| US20080165821A1 (en) * | 2004-10-29 | 2008-07-10 | Volker Raab | Laser resonator comprising an internal beam splitter |
| CN201663343U (en) * | 2010-02-05 | 2010-12-01 | 北京工业大学 | Phase conjugate mirror applied to solid-state slab laser |
| CN102236174A (en) * | 2010-04-28 | 2011-11-09 | 北京国科世纪激光技术有限公司 | Spatial filtering system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113390342A (en) * | 2021-06-21 | 2021-09-14 | 中国工程物理研究院激光聚变研究中心 | Method for judging position of damage point of multi-pass amplification laser system |
| CN113390342B (en) * | 2021-06-21 | 2023-03-14 | 中国工程物理研究院激光聚变研究中心 | Method for judging position of damage point of multi-pass amplification laser system |
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Application publication date: 20120919 |