Actively Q-Switched Mode-Locked Yb-Doped Fiber Laser
with High Mode-Locking Contrast¹

T.-H. Yen^a, J.-H. Lin^b, *, and Y. Lai^a

^a Department of photonics and Institute of Electro-Optical Engineering, National Chia-Tung University,
Hsinchu, 300, Taiwan, China

^b Department of Electro-Optical Engineering and Institute of Electro-Optical Engineering,
National Taipei University of Technology, Taipei, 10608, Taiwan, China

*e-mail: jhlin@ntut.edu.tw

Received August 19, 2011; in final form, September 9, 2011; published online December 28, 2011

Abstract—Reliable Q-switched and mode-locked operation of Yb-doped fiber lasers is investigated by
employing an acousto-optic modulator (AOM) in a linear cavity configuration. The widths and shapes of the Q-
switched envelopes mainly depend on the external modulation frequency of the AOM and near symmetric Q-
switched pulses can be generated. Within the Q-switched envelopes, harmonic mode-locked pulses with near
100% modulation depth at the 40 MHz repetition rate are experimentally observed.

DOI: 10.1134/S1054660X12020247

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