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

Xu Mengmeng; Zhou Yu; Sun Jianfeng; Lu Zhiyong; Lao Chenzhe; He Hongyu; Li Yuexin

doi:10.3788/IRLA202049.0205004

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.

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

1. Key Laboratory of Space Laser Communication and Detection Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;

2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2019-11-12

Rev Recd Date: 2019-12-25

Publish Date: 2020-03-02

Key words:

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.

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Reference (15)

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

doi: 10.3788/IRLA202049.0205004

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