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21 February 2007 Q-switched fiber laser using a novel rotary mirror
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A simple Q-switch, consisting of a rotating planar-mirror where the reflectivity of portions of the surface are high and the reflectivity of the remaining portions are low, is reported. This novel Q-switch is demonstrated using a fiber laser. Using two meters of single-mode, 5 &mgr;m core, Yb-doped fiber, a 40% fiber Bragg-grating (FBG) at 1064 nm, and a single-mode diode-pump at 976 nm, a fiber laser with a threshold power and slope efficiency of approximately 25 mW and 33% was achieved, respectively, with the rotary mirror held stationary at the high-reflectivity region to form part of the laser cavity. With the mirror rotating at a fixed speed of 7200 rpm, pulses with a 140 ns full-width-half-maximum (FWHM) at a repetition rate of 480 Hz were observed. At an optical pump-power of 80 mW, the average power from the Q-switched fiber laser was 3.5 mW resulting in a calculated, peak pulse-power of 48.6 W.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Aland K. Chin, Theodore F. Morse, and Fei Luo "Q-switched fiber laser using a novel rotary mirror", Proc. SPIE 6453, Fiber Lasers IV: Technology, Systems, and Applications, 64531S (21 February 2007);

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