Infrared and Laser Engineering, Volume. 49, Issue 2, 205004(2020)
Generation of linear frequency modulation laser source with broadband narrow linewidth using optical phase modulator
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.
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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): 205004
Category: 激光器与激光光学
Received: Nov. 12, 2019
Accepted: Dec. 25, 2019
Published Online: Mar. 10, 2020
The Author Email: Mengmeng Xu (xmm9210@siom.ac.cn)