212-kHz-linewidth, transform-limited pulses from a single-frequency Q-switched fiber laser based on a few-layer Bi2Se3 saturable absorber
Conventional Q-switched fiber lasers operating at multi-longitudinal-mode oscillation usually suffer from self-mode-locking-induced temporal instability, relatively strong noise, and low coherence. Here, we address the challenge through demonstrating, for the first time, to the best of our knowledge, a single-longitudinal-mode (SLM) Er-doped fiber (EDF) laser passively Q-switched by a few-layer Bi2Se3 saturable absorber (SA). The Bi2Se3 SA prepared by the liquid-phase exfoliation method shows a modulation depth of ～5% and saturation optical intensity of 1.8 MW/cm2. A section of 1-m unpumped EDF together with a 0.06-nm-bandwidth fiber Bragg grating is used as an ultra-narrow autotracking filter to realize SLM oscillation. Stable SLM Q-switching operation at 1.55 μm is successfully achieved with the spectral linewidth as narrow as 212 kHz and the pulse duration of 2.54 μs, manifesting near-transform-limited pulses with a time-bandwidth product of 0.53. In particular, we found that the SLM Q-switching possesses the higher signal-to-noise ratios of 62 dB (optical) and 48 dB (radio frequency), exhibiting its advantages of low noise and high stability. Such an SLM Q-switched fiber laser could gain great interest for some applications in coherent detection, coherent optical communications, and high-sensitivity optical sensing.
基金项目：National Natural Science Foundation of China (NSFC)10.13039/501100001809 (61475129, 91750115); Fundamental Research Funds for the Central Universities (20720180057); Natural Science Foundation of Fujian Province10.13039/501100003392 (2017J06016); Program for New Century Excellent Talents in University (NCET)10.13039/501100004602 of Fujian Province, China.
Jinhai Zou：Department of Electronic Engineering, Xiamen University, Xiamen 361005, China
Yizhong Huang：Department of Electronic Engineering, Xiamen University, Xiamen 361005, China
Kaijie Wang：Department of Electronic Engineering, Xiamen University, Xiamen 361005, China
Tuanjie Du：Department of Electronic Engineering, Xiamen University, Xiamen 361005, China
Shuisen Jiang：Department of Electronic Engineering, Xiamen University, Xiamen 361005, China
Zhengqian Luo：Department of Electronic Engineering, Xiamen University, Xiamen 361005, China
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Weiwei Li, Jinhai Zou, Yizhong Huang, Kaijie Wang, Tuanjie Du, Shuisen Jiang, and Zhengqian Luo, "212-kHz-linewidth, transform-limited pulses from a single-frequency Q-switched fiber laser based on a few-layer Bi2Se3 saturable absorber," Photonics Research 6(10), C29 (2018)