激光线宽
法布里-珀罗干涉仪
相位噪声
光学
激光器
材料科学
相对强度噪声
纵向模式
噪音(视频)
二极管
噪声谱密度
半导体激光器理论
光电子学
物理
噪声系数
计算机科学
人工智能
图像(数学)
放大器
CMOS芯片
作者
Shanting Hu,Pengpeng Lv,Chaoliang Guan,Shasha Li,Qin H,Xiaoqiang Li,Xuan Chen,Zhan Li,Weiqi Wang,Yan Xiao,Minghu Wu
出处
期刊:Sensors
[MDPI AG]
日期:2024-02-08
卷期号:24 (4): 1103-1103
摘要
In the field of inter-satellite laser communication, achieving high-quality communication and compensating for the Doppler frequency shift caused by relative motion necessitate lasers with narrow linewidths, low phase noise, and the ability to achieve mode-hop-free tuning within a specific range. To this end, this paper investigates a novel external cavity diode laser (ECDL) with a frequency-selective F-P etalon structure, leveraging the external cavity F-P etalon structure in conjunction with an auxiliary filter to achieve single longitudinal mode selection. The laser undergoes linewidth testing using a delayed self-heterodyne beating method, followed by the testing of its phase noise and frequency noise characteristics using a noise analyzer, yielding beat spectra and noise power spectral density profiles. Furthermore, the paper introduces an innovative bidirectional temperature-scanning laser method to achieve optimal laser-operating point selection and mode-hop-free tuning. The experimental results showcase that the single longitudinal mode spectral side-mode suppression ratio (SMSR) is around 70 dB, and the output power exceeds 10 mW. Enhancing the precision of the F-P etalon leads to a more pronounced suppression of low-frequency phase noise, reducing the Lorentzian linewidth from the initial 10 kHz level to a remarkable 5 kHz level. The bidirectional temperature-scanning laser method not only allows for the selection of the optimal operating point but also enables mode-hop-free tuning within 160 pm.
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