Stable Passively Q-Switched Operation of Tm³⁺ Doped Silica
Fiber Laser by Anti-Resonant Fabry-Perot Saturable Absorber¹

J. Y. Long^a, D. Y. Shen^a, *, Y. Sh. Wang^a, W. Zhao^a, Y. An^a, and W. Zhou^{a, b}

^a State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics,
Chinese Academy of Sciences, Xi’an 710119, China

^b School of Science, Xi’an Jiaotong University, Xi’an 710049, China

*e-mail: shendy@opt.ac.cn

Received November 21, 2011; in final form, December 20, 2011; published online April 3, 2012

Abstract—We demonstrate a diode-pumped passively Q-switched Tm-doped double-cladding silica fiber laser
operating at wavelength of 1960 nm using an anti-resonant Fabry-Perot saturable absorber as passive modula-
tion element. To determine a relatively preferable fiber length for stable cw Q-switched operation, three active
fiber simples with the length of 1.1, 5.3, and 7.0 m were employed respectively in our experiments. With 1.1 m
gain fiber, we generated Q-switched pulses with a pulse width of 245 ns and an average power of up to 2.2 W
at a repetition rate of 620 kHz. For the longer two fiber samples, Q-switched operation with longer pulse dura-
tion, Q-switched mode-locking and cw mode-locking were observed, respectively.

DOI: 10.1134/S1054660X12050209

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