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Optical delayer

A technology of delayer and optics, which is applied in the field of lasers, can solve the problems of increased difficulty in experimental adjustment, large size of optical delay elements, and increased experimental cost, etc., and achieves the effect of simple structure, reduced production cost, and optical delay

Inactive Publication Date: 2015-02-11
SHANGHAI BRANCH FUZHOU GAOYI COMM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, in order to meet the needs of the application, the size of the entire optical delay element is relatively large, which not only increases the cost of the experiment, but also increases the difficulty of experiment adjustment

Method used

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Comparison scheme
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Embodiment 1

[0014] Example 1: Structure as figure 1 As shown, the incident laser beam is incident from an entrance port of the fiber circulator 101, and then transformed into a collimated beam by the fiber collimator 102. The collimated beam passes through the off-axis integrating cavity of the optical delay device of the present invention. The entrance hole on the cavity mirror 103 enters the cavity, and the exit hole aperture is equivalent to the spot size of the collimated beam. After the light beam travels N times in the integrating cavity, it is emitted from the exit hole of the off-axis integrating cavity rear cavity mirror 104 to realize the (2N+1)×n times the optical beam of the incident laser beam under a certain cavity length L. Delay, where n is the refractive index of the medium in the cavity. figure 1 The pyramid 105 is placed on the outside of the off-axis integrating cavity rear cavity mirror 104 near the exit hole. The pyramid 105 can be adjusted to make the outgoing laser b...

Embodiment 2

[0015] Example 2: Structure as figure 2 As shown, the incident laser beam passes through the polarization beam splitting prism 201, outputs it as p light, and enters the integrating cavity after being reflected by the total mirror 202. After N round-trip reflections propagate in the integrating cavity, it is finally transmitted by the off-axis integrating cavity The exit hole on the rear cavity mirror 104 emits, and the pyramid piece 105 is placed outside the off-axis integrating cavity rear lens 104 near the exit hole. The exit laser beam can be adjusted to return along the original optical path by adjusting the pyramid piece 105. At the same time, a quarter-wave plate 203 is added between the off-axis integrating cavity rear cavity mirror 104 and the pyramid plate 105, so that the polarization of the incident ray is rotated by 90 degrees and then output is separated by s-light polarization. In this structure, if the 20cm integral cavity length can produce 20km optical path, ...

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Abstract

The invention discloses an optical delayer. The optical delayer is characterized by comprising an off-axis integral cavity structure with adjustable cavity length, wherein the off-axis integral cavity structure with adjustable cavity length comprises an off-axis integral cavity front cavity lens and an off-axis integral cavity rear cavity lens; an incidence hole is formed in the off-axis integral cavity front cavity lens; an emergent hole is formed in the off-axis integral cavity rear cavity lens. According to the optical delayer, due to the adoption of the off-axis integral cavity structure, the travel of laser in a cavity can be adjusted by changing the reflection times of a light beam on an integration axis through finely adjusting incidence light direction or the cavity length of an off-axis integral cavity, and optical delaying of an incidence light beam is realized; an emergent light beam can be directly output through the emergent hole or added into a pyramid to be returned along the original way. The optical delayer is simple in structure and convenient to adjust, the production cost can be reduced, and the optical delayer is suitable for batch production.

Description

Technical field [0001] The invention relates to the field of lasers, in particular to an optical delayer. Background technique [0002] In applications such as optical transmission and optical measurement, it is often necessary to use optical components to change the optical path difference of one of the reference laser beams, so as to achieve the coherent superposition of laser beams under different optical delays to achieve the purpose of signal detection. For another example, in the application of frequency domain polarization depolarization, the depolarization effect increases with the increase of the delay amount. Generally, in order to meet application requirements, the size of the entire optical delay element is relatively large, which not only increases the cost of the experiment, but also makes the adjustment of the experiment more difficult. Summary of the invention [0003] In order to overcome the above-mentioned problems, the present invention proposes a small-si...

Claims

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Application Information

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IPC IPC(8): G02B26/00
Inventor 吴砺校金涛林磊
Owner SHANGHAI BRANCH FUZHOU GAOYI COMM CO LTD