High-power laser image transfer space filtering device

A spatial filtering, high-power technology, applied in optics, optical components, instruments, etc., can solve the problems of high device adjustment accuracy, easy to burn filter pinholes, etc., to eliminate the possibility of filter pinholes and simplify the structure. Effect

Active Publication Date: 2014-03-26
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned filter device has obtained a good filter effect to a certain extent, but there are still some problems: such as the filter pinhole that is easy to be burned under the c

Method used

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  • High-power laser image transfer space filtering device
  • High-power laser image transfer space filtering device
  • High-power laser image transfer space filtering device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] figure 1 It is a schematic structural diagram of a high-power laser image transfer low-pass spatial filter device in Embodiment 1 of the present invention, as figure 1 As shown, the high-power laser image transfer low-pass spatial filter device includes: a frequency division lens 11, a restoration lens 12 and a filter pinhole 13, wherein the frequency division lens 11 and the restoration lens 12 form a confocal optical system, and the The frequency division lens 11 and the restoration lens 12 are two convex lenses; the filter aperture 13 is located at the focus of the confocal optical system between the frequency division lens 11 and the restoration lens 12, and the filter aperture 13 The base material is a material with a high-power laser absorption coefficient less than 0.5% / cm, and the base material in this embodiment is a fused silica material that can absorb high-power laser; The front surface is a textured surface; the frequency dividing lens 11, the restoration ...

Embodiment 2

[0025] figure 2 It is a schematic structural diagram of a high-power laser image transfer low-pass spatial filter device in Embodiment 2 of the present invention, as figure 2 As shown, the structure of the high-power laser image transfer low-pass spatial filter device in this embodiment is basically the same as that in Embodiment 1. The difference is that the focal length of the restoration lens 22 is smaller than that of the frequency-division lens 21 to realize the image transfer function of laser beam shrinkage. The base material of the filter aperture 23 is a material with an absorption coefficient of less than 0.5% / cm for high-power laser. The base material in this embodiment is undoped yttrium aluminum garnet, which is located at the focus of the confocal optical system. The rear surface of the incident laser beam perpendicular to the optical axis is a textured surface, and the high-frequency component 25 of the incident laser beam is filtered by the surface to realize...

Embodiment 3

[0027] image 3 It is a schematic structural diagram of a high-power laser image transfer low-pass spatial filter device in Embodiment 3 of the present invention, as image 3 As shown, the structure of the high-power laser image transmission low-pass spatial filter device of this embodiment is basically the same as that of Embodiment 1 and Embodiment 2, the difference is that the focal length of the restoration lens 32 is greater than that of the frequency division lens 31, so as to realize the expansion of the laser beam The image transfer function. The base material of the described filter aperture 33 is a material with an absorption coefficient of high-power laser less than 0.5% / cm. The base material in this embodiment is sapphire, which is located at the focal point of the confocal optical system. The front or rear surface where the laser is incident is a textured surface, and the high-frequency component 35 of the incident laser beam is filtered out by the textured surfa...

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Abstract

The invention discloses a high-power laser image transfer space filtering device. The device is characterized in that the device comprises a frequency division lens, a recovery lens and a filtering small hole, wherein the frequency division lens and the recovery lens form a confocal optical system; and the filtering small hole is positioned at the focal point of the confocal optical system between the frequency division lens and the recovery lens. The device can realize image transfer by adjusting focal distances of the frequency division lens and the recovery lens; and the host material of the filtering small hole only absorbs few laser power, so that the filtering small hole is not required to be subjected to water cooling, the structure of the filtering small hole is simplified, the damage threshold is improved, the possibility that laser burns the filtering small hole is basically eliminated, simultaneously by adopting the scattering effect on laser beam of the roughed surface of the filtering small hole, the high-frequency component energy of the laser beam can be rapidly reduced, and the low-frequency component energy is hardly changed, and a low-pass space filtering function is better realized.

Description

technical field [0001] The invention relates to the technical field of spatial filtering devices, in particular to a high-power laser image transmission low-pass spatial filtering device. Background technique [0002] In high power lasers, in order to obtain high power and high beam quality at the same time, the main oscillator-amplification system is used. In the above system, in order to improve the extraction efficiency of the laser beam, it is necessary to have a good spatial overlap between the laser beam and the laser gain region, and the method of image transfer is generally used to achieve high spatial overlap efficiency. The high-frequency component in the laser amplification process is easy to be amplified due to its high power density and high extraction efficiency, which may worsen the beam quality of high-power lasers, or form "optical nails" that will cause irreversible damage to high-power lasers. destroy. The spatial filtering device can filter out the high...

Claims

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Application Information

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IPC IPC(8): G02B27/46
Inventor 彭钦军徐一汀高宏伟徐健薄勇陈艳中陈中正王保山田昌勇许祖彦
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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