Abstract
We report a unique all fiber-based single-frequency Q-switched laser in a monolithic master oscillator power amplifier configuration at by using highly Tm-doped germanate fibers for the first time. The actively Q-switched fiber laser seed was achieved by using a piezo to press the fiber in the fiber Bragg grating cavity and modulate the fiber birefringence, enabling Q-switching with pulse width and repetition rate tunability. A single-mode polarization maintaining large core highly Tm-doped germanate fiber was used in the power amplifier stage. For pulses with repetition rate, we achieved pulse energy, which corresponds to a peak power of with transform-limited linewidth.
© 2011 Optical Society of America
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