Laser & Optoelectronics Progress, Volume. 61, Issue 1, 0106005(2024)
Fiber Laser Frequency Comb Based on a 45° Tilted Fiber Grating (Invited)
Zinan Huang1, Qianqian Huang1, Haochen Tian2、***, Zhijun Yan3、**, Meng Zou3, Jinghua Sun4, Chenglin Gu5, Kai Wang1, Zishuo Xu1, Weixi Li1, Lilong Dai1, Xindong Liang6, and Chengbo Mou1、*
Author Affiliations
1Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai Institute for Advanced Communication and Data Science, Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai University, Shanghai 200444, China2National Institute of Metrology, China, Beijing 100029, China3School of Optical and Electronic Information, National Engineering Laboratory for Next Generation Internet Access System, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China4School of Electronic Engineering and Intelligentization, Dongguan University of Technology, Dongguan, 523808, Guangdong, China5State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China6Key Laboratory of Gravitational Wave Precision Measurement of Zhejiang Province, Hangzhou Institute for Advanced Study, UCAS, Hangzhou 310024, Zhejiang, Chinashow less
A highly reliable and stable erbium-doped mode-locked fiber laser was constructed using a 45°-tilted fiber grating (45°-TFG) as a fiber polarizer. Based on this, precise signal stabilization of the repetition frequency and carrier-envelope offset frequency was achieved. When the pump power is 228 mW, the mode-locked laser oscillator based on a 45°-TFG can achieve an ultra-short pulse output of 3 dB with a spectral bandwidth of 60.4 nm and a pulse width of 68 fs. The root mean square stability of the power reaches 0.033% within 12 hours, and it can maintain a good stretched mode-locked state over a large pump range. After self-built chirped pulse amplification, super-continuum spectrum generation, and self-reference beat interference optical path, signal with a signal-to-noise ratio of 32 dB was obtained. Finally, by building an active feedback control circuit based on a phase-locked loop, the and signals were traced back to a GPS time-frequency system, and the frequency instability of the and signals was measured to be 2.38×10-12 and 6.41×10-16 within an average time of 1 second. This is the first implementation of a fiber laser frequency comb based on a 45°-TFG, indicating the potential of a 45°-TFG based mode-locked fiber laser in practical applications.
