Abstract
Abstract:We propose and demonstrate a simple and robust actively Q-switched Erbium-doped fiber ring cavity laser. The Q-switching is based on dynamic spectral overlapping of two filters, namely a fiber Bragg grating based filter and a fiber Fabry – Perot tunable filter. Using 3.5 meters of Erbium-doped fiber and a pump power of only 60 mW, Q-switched pulses with a peak power of 9.7 W and a pulse duration of 500 ns were obtained. A pulse repetition rate can be continuously varied from a single shot to a few KHz.