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Method and device for laser coherence length continuous adjustment

A technology of coherence length and laser, applied in the laser field, can solve the problems of small adjustment range and insufficient stability, and achieve the effect of stable performance and compact structure

Active Publication Date: 2015-04-01
RAINBOW SOURCE LASER RSLASER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to propose a method and device capable of continuously adjusting the laser coherence length, so as to overcome the shortcomings of the existing coherence length adjustment device, such as small adjustment range and insufficient stability

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  • Method and device for laser coherence length continuous adjustment
  • Method and device for laser coherence length continuous adjustment
  • Method and device for laser coherence length continuous adjustment

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Embodiment approach

[0043] According to another preferred embodiment of the present invention, the grating is a blazed grating placed in a Littman-Metcalf grazing incidence structure. At this time, the grating can simultaneously obtain large dispersion and low material surface reflectivity, and the grating dispersion item can be simplified for:

[0044] ( ∂ θ G ∂ λ ) G = sin α - sin β λ cos α - - - ( 4 )

[0045] For the above embodiment, by adjusting the rotation and translation device of the grating, it can be ensu...

no. 1 example

[0053] figure 1 It is a structural schematic diagram of the first embodiment of the device for continuously adjusting laser coherence length according to the present invention. Such as figure 1 As shown, the device uses an 808nm semiconductor laser as the laser pumping source 000 of the device in this embodiment.

[0054] The device of this embodiment includes a laser resonant cavity, which contains a prism group composed of sequentially cascaded first optical lens 101, laser gain medium 200, first, second and third right-angle triangular prisms 301, 302, 303 and Blaze grating 400.

[0055] The first optical lens 101 adopts a flat mirror that partially reflects the laser near 1064nm as the output end of the laser.

[0056] Laser gain medium 200 adopts Nd:YVO 4 Crystals used to provide laser gain.

[0057] The first, second, and third rectangular prisms 301, 302, and 303 are placed in an "up-up-down" structure, forming a prism group as a laser beam expander / shrinker device...

no. 2 example

[0064] figure 2 It is a structural schematic diagram of the second embodiment of the device for continuously adjusting laser coherence length according to the present invention. Such as figure 2 As shown, the device also uses an 808nm semiconductor laser as the laser pumping source 000 of the device in the second embodiment.

[0065] The device in this embodiment includes a laser resonant cavity, which contains a third optical lens 103 , a laser gain medium 200 , a frequency doubling crystal 201 and a fourth optical lens 104 cascaded in sequence.

[0066] The third optical lens 103 is used as the incident end of the pumping laser and also as the reflection mirror of the laser resonator, using a flat mirror with high transparency to the laser near 808nm and high reflection to the laser near 1064nm and 532nm.

[0067] Laser gain medium 200 adopts Nd:YVO 4 Crystals used to provide laser gain.

[0068] Frequency doubling crystal 201 adopts KTP crystal, which is used for freq...

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Abstract

The invention belongs to the technical field of laser and particularly relates to a method and a device for laser coherence length continuous adjustment, wherein the method includes the following steps: providing a laser resonant cavity, emitting a pump laser to the laser resonant cavity, wherein the laser is output after oscillating back and forth for many times, providing a laser expanding / shrinking device and a grating inside or outside the laser resonant cavity so that the laser can be emitted to the grating through the laser expanding / shrinking device, continuously adjusting expanding / shrinking multiple of the laser expanding / shrinking device, and meanwhile accordingly adjusting positions and angles of the grating to guarantee an unchanged angle of incidence of the laser on an incidence plane of the grating. The output laser coherence length is adjusted by the above method. The method and the device for laser coherence length continuous adjustment have the advantages of being compact in structure, stable in performance and simple and practical, and thereby being well applied to the application fields of interferometry and the like.

Description

technical field [0001] The invention belongs to the field of laser technology, and in particular relates to a method and device for continuously adjusting laser coherence length. Background technique [0002] The coherence length is a physical quantity to measure the coherence performance of the light source, and it is defined as the maximum optical path difference that the light source light can achieve coherence. Laser is widely used in various optical measurement technologies due to its good coherence, such as coherent optical fiber communication, laser ranging, laser radar and other fields, but for some precision measurement technologies, such as high-speed, ultra-high resolution imaging, precision detection In other applications, highly coherent light sources will generate various optical noises due to multi-surface reflection or transmission, which will reduce the measurement accuracy. For example, when using it to detect the shape of a double-polished transparent par...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/106G02B27/09
Inventor 周翊范元媛宋兴亮王倩翟晔鲍洋崔惠绒王宇
Owner RAINBOW SOURCE LASER RSLASER