Acta Optica Sinica, Volume. 41, Issue 7, 0712002(2021)
Laser Linewidth Measurement Based on Recirculating Self-Heterodyne Method with Short Fiber
A recirculating delayed self-heterodyne method with a short fiber is proposed for the precise measurement of sub-kHz laser linewidth. Using the recirculating delayed self-heterodyne interferometer with an only 2 km delayed fiber, a series of beat signals with different delay times are simultaneously measured. By simulating and fitting the power spectra of multiple high-order beat signals, the average linewidth of 944 Hz for a laser is obtained, which is basically in agreement with that obtained by the traditional beat frequency method. The proposed method can not only avoid a single measurement error, but also effectively reduce the frequency broadening induced by the 1/f frequency noise, therefore it can be used as an accurate detection tool for the linewidth measurement of a narrow linewidth laser.
Get Citation
Copy Citation Text
Jing Gao, Dongdong Jiao, Jie Liu, Xue Deng, Qi Zang, Xiang Zhang, Dan Wang, Xiaofei Zhang, Tao Liu. Laser Linewidth Measurement Based on Recirculating Self-Heterodyne Method with Short Fiber[J]. Acta Optica Sinica, 2021, 41(7): 0712002
Category: Instrumentation, Measurement and Metrology
Received: Oct. 9, 2020
Accepted: Nov. 24, 2020
Published Online: Apr. 11, 2021
The Author Email: Liu Tao (taoliu@ntsc.ac.cn)