Comparison of Different Linewidth Measuring Methods for Narrow Linewidth Laser
Author:
Zheng Ziqi, Luo Qiaoxia, Wang Xian, Ma Xiaohui, Zhang Wei, Fang Wentan, Chen Xiaolin, Huang SongORCID, Zhou Yong, Gao Weiqing
Abstract
We experimentally demonstrate a fiber laser with different linewidths based on self-injection locking (SIL) and the stimulated Brillouin scattering effect. Based on the homemade fiber laser, the error origin, resolution, and applicable range of delayed self-heterodyne interferometry (DSHI), self-correlation envelope linewidth detection (SCELD) and Voigt fitting are investigated numerically and experimentally. The selection of the linewidth measuring method should meet the following conclusions: an approximately Lorentzian self-heterodyne spectrum without the pedestal and high-intensity sinusoidal jitter is a prerequisite for DSHI; the SCELD needs a suitable length of delay fiber for eliminating flicker noise and dark noise of the electrical spectrum analyzer; a non-Lorentzian self-heterodyne spectrum without a pedestal is an indispensable element for Voigt fitting. According to the experimental results, the laser Lorentzian linewidth of SIL changes from 1.7 kHz to 587 Hz under different injection powers. When the Brillouin erbium fiber laser is utilized, the Lorentzian linewidth is measured to be 60 ± 5 Hz.
Funder
National Key R&D Program of China National Natural Science Foundation of China Key R&D Program of Anhui Province Natural Science Foundation of Anhui Province Fundamental Research Funds for the Central Universities
Subject
Electrical and Electronic Engineering,Biochemistry,Instrumentation,Atomic and Molecular Physics, and Optics,Analytical Chemistry
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