双波长激光耦合共焦系统的研究

摘要/Abstract

摘要： 本文以波长分别为633nm和1319nm的激光为例进行激光耦合共焦系统的研究。设计要求两种波长的激光合束聚焦后的会聚角小于10°，本文提出了两种解决思路:一是用反射镜和二向色镜使双波长激光实现共光路，然后经离轴抛物面反射实现共焦；二是用透镜组耦合的方法把双波长激光分别耦合进二合一合束器，合束器采用单模光纤，其芯经为9μm，数值孔径（NA）为0.14，根据光纤和激光器参数设计耦合透镜组。综合考虑采用第二种方法进行实验，给出实验方法及测量结果，并计算出两种波长激光各自的耦合效率。实验结果表明：光纤耦合器耦合法能实现双波长激光合束，并且耦合效率较高，输入波长为633nm时系统的耦合效率大于40%，输入波长为1319nm时系统耦合效率大于30%。实验结果满足设计要求，达到预期的效果。

关键词: 激光技术, 双波长激光耦合共焦, 透镜耦合法, 耦合效率, 合束器

Abstract: In this paper, the lasers with wavelengths of 633nm and 1319nm are taken as examples to study the laser coupled confocal system. In order to satisfy the design requirement that the convergence angle of two kinds of wavelength laser beam after combined focusing is less than 10 degrees, two solutions are proposed in this paper: One is to use a mirror and a dichroic mirror to achieve a common optical path for the double wavelength lasers, and then to achieve confocal via off-axis parabolic reflection; the other is to use a combination lens to couple the dual-wavelength laser into a two-in-one combiner, which uses a single-mode fiber with a core of 9 microns and a numerical aperture (NA) of 0.14, design a coupling lens group based on fiber and laser parameters. Considering the second method, the experimental method and measurement results are given, and the coupling efficiencies of the two wavelength lasers are calculated. The experimental results show that the combined lens coupling method can achieve dual-wavelength laser combining, and the coupling efficiency is higher. The coupling efficiency of the system is greater than 40% when the input wavelength is 633nm, and the system coupling efficiency is greater than 30% when the input wavelength is 1319nm. The experimental results meet the design requirements and achieve the desired results.

Key words: laser technology, dual wavelength laser coupled confocal, lens coupling method, coupling efficiency, fiber combiner

曹明坡，胡明勇，赵础矗，吕敏，张健，王位. 双波长激光耦合共焦系统的研究[J]. 量子电子学报.

Cao Mingpo, Hu Mingyong, Zhao Chuchu, Lv Min，Zhang Jian，Wang Wei. Research on Dual Wavelength Laser Coupling Confocal System[J]. Chinese Journal of Quantum Electronics.

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