High-power single-frequency all-fiber oscillator via manipulation of saturable absorption induced optical bistability

Junxiang Zhang; Quan Sheng; Lu Zhang; Chaodu Shi; Shuai Sun; Wei Shi; Jianquan Yao

doi:10.1117/12.2609153

4 March 2022 High-power single-frequency all-fiber oscillator via manipulation of saturable absorption induced optical bistability

Junxiang Zhang, Quan Sheng, Lu Zhang, Chaodu Shi, Shuai Sun, Wei Shi, Jianquan Yao

Author Affiliations +

Proceedings Volume 11981, Fiber Lasers XIX: Technology and Systems; 119810N (2022) https://doi.org/10.1117/12.2609153
Event: SPIE LASE, 2022, San Francisco, California, United States

Abstract

Saturable absorption effect of unpumped active fiber can be used as a method of achieving single-frequency operation from an all-fiber oscillator. Here, the effect was studied when the signal was highly absorbed by unpumped thulium-doped fiber and the laser threshold was beyond the available pump power. We proved that the oscillator could be manipulated to the “oscillating state” by injecting auxiliary pump light to the saturable absorber fiber. This allowed using unpumped thulium-doped fiber with higher absorption to enhance the frequency selecting capability. A record single-frequency output power of 2.56 W at 1720 nm was obtained, with a slope efficiency of 44% and a linewidth of 3.3 kHz, the power scaling of which was only limited by the available power of the single-mode 1570 nm pump source. This work offers new insights into how high-power, single-frequency fiber oscillators can be produced.

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Citation Download Citation

Junxiang Zhang, Quan Sheng, Lu Zhang, Chaodu Shi, Shuai Sun, Wei Shi, and Jianquan Yao "High-power single-frequency all-fiber oscillator via manipulation of saturable absorption induced optical bistability", Proc. SPIE 11981, Fiber Lasers XIX: Technology and Systems, 119810N (4 March 2022); https://doi.org/10.1117/12.2609153

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