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Folded internal cavity variable reflectivity optical parametric oscillator

A technology of optical parametric oscillators and reflectivity, which is applied to the structure/shape of optical resonators, lasers, laser components, etc., and can solve problems such as reducing beam quality and damage to optical components

Inactive Publication Date: 2003-12-10
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of optical component damage and reduced beam quality caused by mutual interference between the pumping optical path and the parametric resonator optical Louis in the existing inner cavity structure

Method used

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  • Folded internal cavity variable reflectivity optical parametric oscillator
  • Folded internal cavity variable reflectivity optical parametric oscillator
  • Folded internal cavity variable reflectivity optical parametric oscillator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: The folded intracavity optical parametric oscillator adopts an unstable cavity structure.

[0019] Such as Figure 2a As shown, the folded intracavity variable reflectivity optical parametric oscillator adopts an unstable cavity structure, and the nonlinear crystal 2 is KTP (KTiOPO4), which works in a non-critical phase matching mode; the laser working medium 5 is Nd:YAG, and the xenon lamp 12 Provide excitation to generate laser light with a wavelength of 1064nm. The convex surface of the signal light output mirror 3 is coated with a 1570nm variable reflectivity film system, and the concave surface is coated with a 1570nm high-transmittance filter layer. The variable reflectivity curve of the signal light output mirror 3 adopts a second-order Gaussian line shape, and the output wavelength in this example is around 1570 nm. The structure of the variable reflectivity film system of the signal light output mirror 3 is as follows: Figure 2b As shown, the m...

Embodiment 2

[0024] Embodiment 2: The folded intracavity optical parametric oscillator adopts a flat cavity structure.

[0025] The folded intracavity variable reflectivity optical parametric oscillator adopts a flat cavity structure, such as image 3 shown. The difference from the first embodiment is that the three cavity mirrors of the pump resonant cavity and the optical parametric resonant cavity are all plane mirrors, and the structure of other parts is the same as that of the first embodiment. The structure and processing method of the variable reflectivity mold layer are the same as those in the first embodiment.

[0026] Embodiment 2 outputs the same 1.57μm infrared laser beam, but because of the flat cavity structure, the beam quality of the pump laser is limited, especially the far-field divergence angle, but the structure conversion efficiency of the flat cavity is higher. Although the quality of the light beam output by the flat cavity structure is reduced, the second embodim...

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Abstract

The present invention discloses a folded internal cavity variable reflectivity optical parametric oscillator, including pumping resonant cavity and optical parametric resonant cavity, the pumping resonant cavity successively includes pump output lens, passive regulated Q crystal, polarizer, laser working medium, excitation xenon lamp, beam-separating lens, non-linear crystal and reflector, and the described optical parametric resonant cavity successively includes reflector, non-linear crystal, beam-separating lens and signal light output lens. The pumping resonant cavity and optical parametric resonant cavity are formed into a certain angle, and said angle is regulated by described beam-separating lens.

Description

technical field [0001] The invention relates to an optical parametric oscillator of a cavity mirror with a folded structure and variable reflectivity, and belongs to the technical field of lasers. Background technique [0002] The optical parametric oscillator uses a nonlinear crystal as a working medium and places it in a resonant cavity, which is beneficial to the nonlinear coupling effect in the crystal and converts the pump light energy into signal light. The optical parametric resonant cavity makes the signal light reciprocate to gain gain, and forms a laser output with a specific wavelength. The simplest optical parametric oscillator is an external cavity structure, which consists of a nonlinear crystal placed in two resonant cavity mirrors, and an external independent pump light is injected into the optical parametric resonant cavity for pumping. The external cavity structured optical parametric oscillator has a simple structure, but if the size of the pump laser is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/08H01S3/086H01S3/105
Inventor 巩马理保奭燚黄磊陈刚
Owner TSINGHUA UNIV