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基于相位调制器的宽带窄线宽的线性调频激光源的产生

Generation of linear frequency modulation laser source with broadband narrow linewidth using optical phase modulator

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摘要

提出了一种基于相位调制器(PM)和可调谐光滤波器产生线性调频激光信号的方法。该方法利用带有基频的微波线性调频信号作为相位调制器的驱动信号, 窄线宽的激光种子源经相位调制器调制后产生一系列的宽带线性调频激光信号。通过可调谐光滤波器抑制其他边带保留所需阶次的线性调频激光信号。实验结果表明: 当光滤波器保留正二阶调频激光信号时, 获得了调频带宽为2 GHz、调频速率为6 THz/s的线性调频激光信号。在观测时间为1 ms时, 测得的线性调频激光信号的瞬时线宽为3.2 kHz。该方法结构简单, 易于实现, 并且对调频连续波激光雷达、相干光谱分析等测量应用有重要意义。

Abstract

An approach to generate linear frequency modulation laser source based on an optical phase modulator and a tunable optical filter was proposed. A narrow linewidth fiber laser seed source was modulated by an optical phase modulator, whose driven ratio frequency (RF) signal was generated by the microwave linear frequency modulation signal with a fundamental frequency, and thus a series of wideband linear frequency modulation laser signals were generated. A tunable optical filter was used to select the desired linear frequency modulation optical sideband and suppress the others modulation sidebands. The experimental results show that when the optical filter retains the positive second order modulation sideband, a linear frequency modulation laser signal with a tuning range of 2 GHz and tuning rate of 6 THz/s is obtained. The instantaneous linewidth of the linear frequency modulation laser signal is 3.2 kHz in 1 ms observation time. The system is simple in structure and easy to implement. This technique has important significance for the applications such as frequency modulated continuous wave laser radar and coherent spectroscopy.

广告组1.2 - 空间光调制器+DMD
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中图分类号:TN248.1

DOI:10.3788/irla202049.0205004

所属栏目:激光器与激光光学

基金项目:国家自然科学基金(61505233, 61605226)

收稿日期:2019-11-12

修改稿日期:2019-12-25

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许蒙蒙:中国科学院上海光学精密机械研究所 空间激光传输与探测技术重点实验室, 上海 201800中国科学院大学 材料与光电研究中心, 北京 100049
周 煜:中国科学院上海光学精密机械研究所 空间激光传输与探测技术重点实验室, 上海 201800
孙建锋:中国科学院上海光学精密机械研究所 空间激光传输与探测技术重点实验室, 上海 201800
卢智勇:中国科学院上海光学精密机械研究所 空间激光传输与探测技术重点实验室, 上海 201800
劳陈哲:中国科学院上海光学精密机械研究所 空间激光传输与探测技术重点实验室, 上海 201800中国科学院大学 材料与光电研究中心, 北京 100049
贺红雨:中国科学院上海光学精密机械研究所 空间激光传输与探测技术重点实验室, 上海 201800中国科学院大学 材料与光电研究中心, 北京 100049
李跃新:中国科学院上海光学精密机械研究所 空间激光传输与探测技术重点实验室, 上海 201800中国科学院大学 材料与光电研究中心, 北京 100049

联系人作者:许蒙蒙(xmm9210@siom.ac.cn)

备注:许蒙蒙(1992-), 女, 博士生, 主要从事激光测速测距方面的研究。

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引用该论文

Xu Mengmeng,Zhou Yu,Sun Jianfeng,Lu Zhiyong,Lao Chenzhe,He Hongyu,Li Yuexin. Generation of linear frequency modulation laser source with broadband narrow linewidth using optical phase modulator[J]. Infrared and Laser Engineering, 2020, 49(2): 0205004

许蒙蒙,周 煜,孙建锋,卢智勇,劳陈哲,贺红雨,李跃新. 基于相位调制器的宽带窄线宽的线性调频激光源的产生[J]. 红外与激光工程, 2020, 49(2): 0205004

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