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20 February 2007 High-peak power-pulsed single-mode linearly-polarized LMA fiber amplifier and Q-switch laser
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Abstract
We report on the recent progress in the design and development of completely monolithic linearly-polarized pulsed fiber amplifiers seeded by Q-switched fiber laser oscillators. We demonstrate near diffraction limited beam quality with ~ 20 kW peak power (1mJ pulse energy, ~ 45 nsec) pulses and an average power ~ 20 W at 20 kHz repetition rate with linearly polarized (> 17dB PER) output from a simple MOPA design. The laser produces spectrally narrow pulses with ~ 0.5 nm linewidth centered at 1064nm, suitable for various non-linear applications including generation of visible and UV light. The simple MOPA design consists of a monolithic fiber amplifier based on an optimized coil of polarization maintaining large mode area (PM-LMA) fiber with 30 &mgr;m core and low power Q-switched fiber oscillator. Excellent output beam quality is achieved through the mode selectivity of the coiled PM-LMA fiber in the amplifier stage. Such compact and robust fiber lasers are suitable for a variety of applications, such as nonlinear wavelength conversion processes using a variety of nonlinear materials, laser radars, etc.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
V. Khitrov, B. Samson, D. Machewirth, D. Yan, K. Tankala, and A. Held "High-peak power-pulsed single-mode linearly-polarized LMA fiber amplifier and Q-switch laser", Proc. SPIE 6453, Fiber Lasers IV: Technology, Systems, and Applications, 645305 (20 February 2007); https://doi.org/10.1117/12.712341
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