CN103676187A - High-power laser image transmission low-pass spatial filtering device - Google Patents
High-power laser image transmission low-pass spatial filtering device Download PDFInfo
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- CN103676187A CN103676187A CN201210333575.6A CN201210333575A CN103676187A CN 103676187 A CN103676187 A CN 103676187A CN 201210333575 A CN201210333575 A CN 201210333575A CN 103676187 A CN103676187 A CN 103676187A
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- 230000031700 light absorption Effects 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- JNDMLEXHDPKVFC-UHFFFAOYSA-N aluminum;oxygen(2-);yttrium(3+) Chemical compound [O-2].[O-2].[O-2].[Al+3].[Y+3] JNDMLEXHDPKVFC-UHFFFAOYSA-N 0.000 claims description 3
- 239000005350 fused silica glass Substances 0.000 claims description 3
- 229910052594 sapphire Inorganic materials 0.000 claims description 3
- 239000010980 sapphire Substances 0.000 claims description 3
- 229910019901 yttrium aluminum garnet Inorganic materials 0.000 claims description 3
- 230000006378 damage Effects 0.000 abstract description 3
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- 239000000758 substrate Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- 230000008030 elimination Effects 0.000 description 3
- 238000003379 elimination reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
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- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
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Abstract
The invention discloses a high-power laser image transfer low-pass spatial filtering device, which is characterized by comprising the following components: the frequency dividing lens and the restoration lens form a confocal optical system, and the filtering aperture is positioned at the focal point of the confocal optical system between the frequency dividing lens and the restoration lens. The high-power laser image transmission low-pass spatial filter device can realize image transmission by adjusting the focal lengths of the frequency division lens and the recovery lens; the substrate material of the filtering small hole only absorbs little laser power, so that the filtering small hole does not need to be water-cooled, the structure of the filtering small hole is simplified, the damage threshold value is improved, the possibility that the filtering small hole is burnt by laser is basically eliminated, and meanwhile, the high-frequency component energy of the laser beam is rapidly reduced and the low-frequency component energy is almost unchanged by utilizing the scattering effect of the roughened surface of the filtering small hole on the laser beam, so that the low-pass spatial filtering function is better realized.
Description
Technical field
The present invention relates to spatial filter arrangement technical field, particularly a kind of high power laser light picture transmits low pass spatial filter arrangement.
Background technology
In superpower laser, in order to obtain high-power and high-lighting beam quality simultaneously, adopt main shake-amplification system.In said system, in order to improve the extraction efficiency of laser beam, need laser beam and laser gain district to have good space overlapping, the general method that adopts picture to transmit realizes the overlapping efficiency in high space.Therefore high fdrequency component in laser amplifier process, because its power density is very large, extraction efficiency is high, is easy to be exaggerated, and gently worsens superpower laser beam quality, heavy formation " light nail " causes expendable destruction to superpower laser.The high fdrequency component of spatial filter arrangement in can filtering laser amplifier process, improve superpower laser beam quality, effectively protect superpower laser, people have proposed multiple spatial filter arrangement for this reason, for example, a kind of laser beam spacing shaping device being formed by quartz crystal plano-convex lens, filtering aperture, ordinary lens and polaroid; Another volume holographic grating forming device, dynamically, multi-functionally to ultra-short pulse laser Shu Jinhang shaping; And a kind of high power diffraction type spatial filter arrangement, meet the round trip that high power laser system multipass amplifies and inter-stage is isolated, the needs of two shaft space filtering.Above-mentioned filter has obtained good filter effect to a certain extent, but also has some problems: as the filtering pin hole easily burning under high power laser light condition, diffraction type original paper is difficult to meet the demand that picture transmits, and with the degree of regulation of timer, also has relatively high expectations.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention is to provide a kind of high power laser light picture and transmits low pass spatial filter arrangement, by different step lens, restore lens and the combination of filtering aperture, realize laser beam as propagation function in, use a kind of filtering aperture, its host material only absorbs laser power seldom, without this filtering aperture is carried out to water-cooled, simplified filtering small structure, improve damage threshold, utilize its scattering process of texturing surface to laser beam simultaneously, laser beam high fdrequency component energy is reduced rapidly and low frequency component energy is almost constant, realize better picture and transmitted low pass spatial filtering function.
(2) technical scheme
The invention provides a kind of high power laser light picture and transmit low pass spatial filter arrangement, comprise: step lens, recovery lens and filtering aperture, wherein said step lens and described recovery lens form confocal optical system, the focus place of the confocal optical system of described filtering aperture between described step lens and described recovery lens.
Better, described step lens, recovery lens and filtering aperture and the same optical axis of direction of beam propagation; The base material of described filtering aperture is for being less than the material of 0.5%/cm to high power laser light absorption coefficient.
Better, described step lens is arranged at the position that the low frequency component that makes the incoming laser beam of aperture is after filtering separated at the back focal plane of described step lens, restores the frequency component of required incoming laser beam by described recovery lens.
Better, described step lens and described recovery lens are two convex lens.
Better, described filtering aperture is for being less than the material of 0.5%/cm to high power laser light absorption coefficient.
Better, the focal length of described step lens and described recovery lens is equal, and described filtering aperture is texturing surface perpendicular to the front surface of the laser incident of optical axis, and its base material matter is fused quartz.
Better, the focal length of described recovery lens is less than the focal length of described step lens, and described filtering aperture is texturing surface perpendicular to the rear surface of the laser incident of optical axis, and its base material matter is doped yttrium aluminum garnet not.
Better, the focal length of described recovery lens is greater than the focal length of described step lens, and described filtering aperture is texturing surface perpendicular to the front or rear surface of the laser incident of optical axis, and its base material matter is sapphire.
Better, the aperture of described filtering aperture is adjustment aperture.
(3) beneficial effect
High power laser light picture of the present invention transmits low pass spatial filter arrangement, by adjusting the focal length of step lens and recovery lens, can realize dissimilar picture propagation function; Utilize its scattering process of texturing surface to laser beam, laser beam high fdrequency component energy is reduced rapidly and low frequency component energy is almost constant, realized simply low pass spatial filtering function, the host material of the aperture of filtering simultaneously only absorbs laser power seldom, thereby without this filtering aperture is carried out to water-cooled, simplify filtering small structure, substantially eliminated the possibility that laser burns filtering aperture.
Accompanying drawing explanation
Fig. 1 is the structural representation that the embodiment of the present invention 1 high power laser light picture transmits low pass spatial filter arrangement;
Fig. 2 is the structural representation that the embodiment of the present invention 2 high power laser light pictures transmit low pass spatial filter arrangement;
Fig. 3 is the structural representation that the embodiment of the present invention 3 high power laser light pictures transmit low pass spatial filter arrangement.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
Embodiment 1
Fig. 1 is the structural representation that the embodiment of the present invention 1 high power laser light picture transmits low pass spatial filter arrangement, as shown in Figure 1, high power laser light picture transmits low pass spatial filter arrangement and comprises: step lens 11, recovery lens 12 and filtering aperture 13, wherein said step lens 11 and described recovery lens 12 form confocal optical system, and described step lens 11 and described recovery lens 12 are two convex lens; The focus of the confocal optical system of described filtering aperture 13 between described step lens 11 and described recovery lens 12, the base material of described filtering aperture 13 is for being less than the material of 0.5%/cm to high power laser light absorption coefficient, the matrix material in the present embodiment is for absorbing the fused quartz material of high power laser light; Described filtering aperture 13 is texturing surface perpendicular to the front surface of the laser incident of optical axis; Described step lens 11, recovery lens 12 and filtering aperture 13 and the same optical axis of direction of beam propagation.
Please refer again to shown in Fig. 1, described step lens 11 is arranged at the low frequency component 14 of the incoming laser beam of aperture 13 is after filtering separated at described step lens 11 back focal planes, by described recovery lens 12, restore the frequency component of required incoming laser beam, adjust the distance between described recovery lens 12 and described step lens 11, step lens 11 is equated with the focal length that restores lens 12, on exit facet 18, form large picture such as the plane of incidence 17 grade, form recovery laser beam 16, thereby realize the picture propagation function of laser beam 1:1.Filtering aperture 3 is placed in the focus place of described confocal optical system, and its aperture can regulate, and relies on texturing front surface elimination incident laser speed high fdrequency component 15, realizes low-pass filtering function.
Embodiment 2
Fig. 2 is the structural representation that the embodiment of the present invention 2 high power laser light pictures transmit low pass spatial filter arrangement, as shown in Figure 2, the structure of the present embodiment and embodiment 1 high power laser light picture transmission low pass spatial filter arrangement is basic identical, difference is, restore lens 22 focal lengths and be less than step lens 21, realize the picture propagation function of laser beam contracting bundle.The base material of described filtering aperture 23 is for being less than the material of 0.5%/cm to high power laser light absorption coefficient, base material in the present embodiment is doped yttrium aluminum garnet not, be positioned at the focus of this confocal optical system, its rear surface perpendicular to the laser incident of optical axis is texturing surface, rely on this surface elimination incoming laser beam high fdrequency component 25, realize low-pass filtering function.
Embodiment 3
Fig. 3 is the structural representation that the embodiment of the present invention 3 high power laser light pictures transmit low pass spatial filter arrangement, as shown in Figure 3, the structure of the high power laser light picture transmission low pass spatial filter arrangement of the present embodiment and embodiment 1, embodiment 2 is basic identical, difference is, restore lens 32 focal lengths and be greater than step lens 31, realize the picture propagation function that laser beam expands.The base material of described filtering aperture 33 is for being less than the material of 0.5%/cm to high power laser light absorption coefficient, base material in the present embodiment is sapphire, be positioned at the focus of this confocal optical system, its front or rear surface perpendicular to the laser incident of optical axis is texturing surface, rely on its texturing surface elimination incoming laser beam high fdrequency component 35, realize low-pass filtering function.
In sum, the confocal step lens that the low pass spatial filter arrangement of transmitting high power laser light picture of the present invention combines by different focal and recovery lens, the feature of the filtering aperture of low absorption base material and the scattering process on texturing surface thereof, the picture that can realize high-power laser beams transmits and low pass spatial filtering, thereby is with a wide range of applications in fields such as national security, advanced manufactures.
Above embodiment is only for illustrating the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (8)
1. a high power laser light picture transmits low pass spatial filter arrangement, it is characterized in that, comprise: step lens, recovery lens and filtering aperture, wherein said step lens and described recovery lens form confocal optical system, the focus place of the confocal optical system of described filtering aperture between described step lens and described recovery lens.
2. high power laser light picture as claimed in claim 1 transmits low pass spatial filter arrangement, it is characterized in that described step lens, recovery lens and filtering aperture and the same optical axis of direction of beam propagation; The base material of described filtering aperture is for being less than the material of 0.5%/cm to high power laser light absorption coefficient.
3. high power laser light picture as claimed in claim 1 or 2 transmits low pass spatial filter arrangement, it is characterized in that, described step lens is arranged at the position that the low frequency component that makes the incoming laser beam of aperture is after filtering separated at the back focal plane of described step lens, restores the frequency component of required incoming laser beam by described recovery lens.
4. high power laser light picture as claimed in claim 3 transmits low pass spatial filter arrangement, it is characterized in that, described step lens and described recovery lens are two convex lens.
5. high power laser light picture as claimed in claim 4 transmits low pass spatial filter arrangement, it is characterized in that, the focal length of described step lens and described recovery lens is equal, and described filtering aperture is texturing surface perpendicular to the front surface of the laser incident of optical axis, and its base material matter is fused quartz.
6. high power laser light as claimed in claim 4 passes picture and passs low pass spatial filter arrangement, it is characterized in that, the focal length of described recovery lens is less than the focal length of described step lens, described filtering aperture is texturing surface perpendicular to the rear surface of the laser incident of optical axis, and its base material matter is doped yttrium aluminum garnet not.
7. high power laser light picture as claimed in claim 4 transmits low pass spatial filter arrangement, it is characterized in that, the focal length of described recovery lens is greater than the focal length of described step lens, and described filtering aperture is texturing surface perpendicular to the front or rear surface of the laser incident of optical axis, and its base material matter is sapphire.
8. high power laser light picture as claimed in claim 4 transmits low pass spatial filter arrangement, it is characterized in that, the aperture of described filtering aperture is adjustment aperture.
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| CN201210333575.6A CN103676187B (en) | 2012-09-10 | 2012-09-10 | High-power laser image transmission low-pass spatial filtering device |
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| CN201210333575.6A CN103676187B (en) | 2012-09-10 | 2012-09-10 | High-power laser image transmission low-pass spatial filtering device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104374677A (en) * | 2014-10-09 | 2015-02-25 | 南京市计量监督检测院 | Concentration measuring device and method for dust in large diameter range |
| CN104849873A (en) * | 2015-04-28 | 2015-08-19 | 中国科学院理化技术研究所 | Spatial filtering device |
| CN106896510A (en) * | 2017-04-18 | 2017-06-27 | 中国工程物理研究院激光聚变研究中心 | Improve method of the spatial filter to the even sliding beam transmittance of small broadband spectral dispersion |
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| CN1959364A (en) * | 2006-11-24 | 2007-05-09 | 浙江大学 | Apparatus for testing performance of optical low pass filter |
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| CN101038412A (en) * | 2007-03-29 | 2007-09-19 | 中国科学院上海光学精密机械研究所 | Ultrashort pulse laser filter device |
| US20080170291A1 (en) * | 2007-01-15 | 2008-07-17 | Sumitomo Electric Industries, Ltd. | Laser processing apparatus |
| 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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- 2012-09-10 CN CN201210333575.6A patent/CN103676187B/en active Active
Patent Citations (6)
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| CN1431542A (en) * | 2003-01-27 | 2003-07-23 | 中国科学院上海光学精密机械研究所 | Small-hole real image transmission device |
| CN1959364A (en) * | 2006-11-24 | 2007-05-09 | 浙江大学 | Apparatus for testing performance of optical low pass filter |
| US20080170291A1 (en) * | 2007-01-15 | 2008-07-17 | Sumitomo Electric Industries, Ltd. | Laser processing apparatus |
| CN101038412A (en) * | 2007-03-29 | 2007-09-19 | 中国科学院上海光学精密机械研究所 | Ultrashort pulse laser filter device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104374677A (en) * | 2014-10-09 | 2015-02-25 | 南京市计量监督检测院 | Concentration measuring device and method for dust in large diameter range |
| CN104849873A (en) * | 2015-04-28 | 2015-08-19 | 中国科学院理化技术研究所 | Spatial filtering device |
| CN104849873B (en) * | 2015-04-28 | 2017-04-19 | 中国科学院理化技术研究所 | spatial filtering device |
| CN106896510A (en) * | 2017-04-18 | 2017-06-27 | 中国工程物理研究院激光聚变研究中心 | Improve method of the spatial filter to the even sliding beam transmittance of small broadband spectral dispersion |
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| CN103676187B (en) | 2014-10-29 |
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