Theoretical and experimental investigation of optical bistability in end-pumped Tm，Ho：YLF lasers

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Abstract
We demonstrate the strong optical bistability of a 2μm continuous wave Tm，Ho：YLF laser end pumped by a 792nm fiber-coupled laser diode. The quasi-three-level rate equation theoretical model is given under consideration of the energy transfer upconversion and ground state reabsorption effects. The bistable output of Tm，Ho：YLF laser is predicted theoretically by solving the coupled rate equations and the mechanism of the bistability output is analyzed. The bistable output is also studied experimentally. When the laser crystal is at 253K，the width of the bistable region is 1.6W and the jump power at the tujump point is 82.5mW. The theoretical results are in agreement with the experimental results，showing that the theoretical model is reasonable.

Keywords:
end-pumped /

Tm /

Ho：YLF crystal /

continuous wave output /

optical bistability
Authors and contacts
Zhang Xin-Lu¹,

Wang Yue-Zhu²,

Li Li¹,

Ju You-Lun²,

Jiang Bo¹

(1)哈尔滨工程大学理学院，哈尔滨 150001; (2)哈尔滨工业大学光电技术研究所可调谐激光国家重点实验室，哈尔滨 150001
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