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用于高精度测量位移等参量的光纤多波长激光器

Research on optical fiber multi-wavelength laser for measuring displacement precisely

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摘要

本文研究并实验了光纤单波长激光器、光纤双波长激光器、以及光纤三波长激光器, 分别发出单波长、双波长、以及三波长激光, 分别用于对位移、台阶高度、绝对距离等参量的高精度干涉测量。利用光纤光栅只反射布拉格波长的特性, 将光纤光栅作为光纤激光谐振腔的反射镜和波长选择元件, 可以使光纤激光器具有单个或者多个独立的但光程重叠的激光谐振腔, 每个激光谐振腔有掺铒光纤作为增益介质。980 nm激光的泵浦下, 光纤多波长激光器分别发出单波长、双波长、以及三波长激光, 每个波长值可以根据需要确定, 两个波长之间的间隔也可以根据需要确定。光纤多波长激光器发出的多波长之间无模式竞争, 每个波长的功率和频率都稳定。每个波长的稳定度达10-7, 能够满足对位移、台阶高度、绝对距离进行高精度干涉测量的要求。

Abstract

Three types of optical fiber lasers that can emit one, two, or three wavelengths simultaneously were researched and experimented on. The three types of lasers could be applied to measure displacement, step height, and absolute distance, respectively. By employing the characteristic that a fiber Bragg grating could only reflect a Bragg wavelength, fiber Bragg gratings have been used as the reflective mirrors of the laser resonant cavities and wavelength selectors. As such, a single laser resonant cavity and multiple independent laser resonant cavities with overlapped laser optical paths were constructed with a length of erbium-doped optical fiber in each cavity. Pumped by a 980-nm laser, the optical fiber lasers could emit a single wavelength and multiple wavelengths simultaneously; the value of each wavelength could be determined as needed. Furthermore, the wavelength interval between two adjacent wavelengths could be determined as needed. There is no laser mode competition between the wavelengths, as each wavelength has a stable power and frequency. Wavelength stability can reach up to 10-7, satisfying the precision requirements of measuring displacement, step height, and absolute distance through interferometric methods.

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中图分类号:TN242

DOI:10.3788/ope.20192709.2036

基金项目:北京市自然科学基金资助项目(No.3172024)

收稿日期:2019-05-26

修改稿日期:2019-06-17

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作者单位    点击查看

王韵致:北京交通大学 理学院 光电信息科学与工程专业实验室, 北京 100044
谢 芳:北京交通大学 理学院 光电信息科学与工程专业实验室, 北京 100044
陈龙辉:北京交通大学 理学院 光电信息科学与工程专业实验室, 北京 100044
李明佳:北京交通大学 理学院 光电信息科学与工程专业实验室, 北京 100044
徐海波:北京交通大学 理学院 光电信息科学与工程专业实验室, 北京 100044

联系人作者:王韵致(13118420@bjtu.edu.cn)

备注:王韵致(1990-), 女, 安徽芜湖人, 博士研究生。2013年于北京交通大学获得本科学位。主要从事光电检测、光纤传感方面的研究。

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引用该论文

WANG Yun-zhi,XIE Fang,CHEN Long-hui,LI Ming-jia,XU Hai-bo. Research on optical fiber multi-wavelength laser for measuring displacement precisely[J]. Optics and Precision Engineering, 2019, 27(9): 2036-2042

王韵致,谢 芳,陈龙辉,李明佳,徐海波. 用于高精度测量位移等参量的光纤多波长激光器[J]. 光学 精密工程, 2019, 27(9): 2036-2042

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