A laser-diode-pumped Yb-doped double-clad fiber laser operating in a hybrid <i>Q</i> -switched regime has been demonstrated. With pulsed pump light and stimulated Brillouin scattering of the gain fiber as the Q -switching mechanisms, the laser generated nanosecond pulses with a stable repetition rate. A single-pulse energy of as much as 143.1 µJ with a peak power of 28.6 kW was obtained. Use of an external-cavity diffraction grating in the Littman configuration permitted tuning of the laser wavelength over a 15.7-THz range from 1080 to 1140 nm, and a linewidth of 0.04 nm over the whole tuning range was achieved.
© 2003 Optical Society of America
(140.3510) Lasers and laser optics : Lasers, fiber
(140.3540) Lasers and laser optics : Lasers, Q-switched
(140.3600) Lasers and laser optics : Lasers, tunable
(190.4370) Nonlinear optics : Nonlinear optics, fibers
(290.5830) Scattering : Scattering, Brillouin
Ya-Xian Fan, Fu-Yun Lu, Shu-Ling Hu, Ke-Cheng Lu, Hong-Jie Wang, Guang-Yin Zhang, and Xiao-Yi Dong, "Narrow-linewidth widely tunable hybrid Q-switched double-clad fiber laser," Opt. Lett. 28, 537-539 (2003)