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New progress in single-frequency fiber laser research
Release time:
2023-11-17
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New progress in single-frequency fiber laser research
Recently, the research group of researcher Mao Qinghe of Anhui Institute of Optics and Mechanics of Chinese Academy of Sciences has made important progress in single-frequency fiber laser research: based on injection seed technology and ring cavity scheme, a Q-switched fiber laser is designed and developed, which realizes high stability single longitudinal mode laser pulse output, and the linewidth of direct output Q-switched laser pulse is as narrow as 1.5 MHz, which is the narrowest linewidth Q-switched fiber laser pulse in the world, and the repetition frequency 1~100 kHz, pulse width 50 ~ 400ns adjustable. The relevant results were published in the IEEE Photonics Journal, an internationally renowned optical engineering journal (2017, 9(1), 1500607).
In order to obtain this kind of pulse laser with extremely narrow linewidth, the research group has been working hard for many years. Firstly, a single longitudinal mode low noise continuous wave fiber laser with linewidth less than 10 kHz is designed and developed, and the relative intensity noise and frequency noise of this laser reach-110dB/Hz and 45dB Hz2/Hz respectively. Then, a low pressure gas cavity frequency reference based on hollow core photonic crystal fiber (HC-PCF) is designed and developed, thus the frequency stabilization of continuous wave fiber laser is realized, this solves the problem of the seed laser source of the injection seed single longitudinal mode Q-switched fiber laser, and on this basis, by eliminating the frequency shift of the pigtail type acousto-optic modulator in the seed injection single longitudinal mode Q-switched laser operation, and finally by active intensity modulation Q-switch, the single longitudinal mode Q-switched fiber laser pulse with very narrow linewidth is obtained. At present, the research group has adopted optical fiber amplification technology to increase the energy of this single longitudinal mode Q-switched pulse to 0.2mJ, and the linewidth is still less than 2MHz, while for continuous wave fiber laser, the power is increased to 10W, and the linewidth is still within 40kHz. In addition, through the rational design of the cooling system and pump control module, this high-power single-longitudinal-mode continuous wave and pulsed fiber laser is developed into an engineering prototype, which has been initially applied. These developments have also been published in recent years in IEEE Photonics Technology Letters, Applied Optics and other journals.
Schematic diagram of single longitudinal mode Q-switched fiber laser
Single longitudinal mode and linewidth of Q-switched fiber laser pulses
This single longitudinal mode continuous wave or pulsed laser source has broad application prospects in the fields of material fine structure analysis, precision laser spectroscopy and high-end laser radar, gravitational wave detection and coherent detection and sensing. The research work has been funded by the National High-tech Research and Development Program, the National Natural Science Foundation of China, and the Strategic Leading Science and Technology Project of the Chinese Academy of Sciences (Class B).
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