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Abstract: We demonstrate passive Q-switching of short-length double-clad Tm3+-doped silica fiber lasers near 2μm pumped by a laser diode array (LDA) at 790nm. Polycrystalline Cr2+:ZnSe microchips with thickness from 0.3 to 1mm are adopted as the Q-switching elements. Pulse duration of 120ns, pulse energy over 14μJ and repetition rate of 53kHz are obtained from a 5-cm long fiber laser. As high as 530kHz repetition rate is achieved from a 50-cm long fiber laser at ∼10-W pump power. The performance of the Q-switched fiber lasers as a function of fiber length is also analyzed. [Copyright &y& Elsevier]

Abstract: Thermal effects in Nd:YAG planar waveguide lasers with non-symmetrical claddings are discussed. The heat generated in the active core can be removed more efficiently by directly contacting the active core to the heat sink. Several cladding materials are compared to optimize the heat removal. Furthermore, uniform pumping is achieved with oblique edge-pumping technique. Using quasi-CW pumping at 1KHz repetition rate, an average output power of 280W with a slope efficiency of 38% is obtained with a positive unstable resonator. [Copyright &y& Elsevier]

Abstract: Diode end-pumped continuous-wave and passively Q-switched Nd:Lux(x=0.5)Y1−xVO4 mixed crystal lasers were demonstrated. At the pump power of 12.6W, the maximum output power of 6.7W around 1066.5nm was obtained with the output transmission of 27%. The optical conversion efficiency is 53.2%, corresponding to a slope efficiency of 55.8%. For pulsed operation, the shortest pulse width attained was 8.6ns, with the pulse repetition frequency of 99kHz, and the single pulse energy and the peak power were estimated to be 25.5μJ and 2.96kW, respectively. [ABSTRACT FROM AUTHOR]