Abstract

We propose a technique for eliminating self-lasing and suppressing amplified spontaneous emission in a partially pumped slab amplifier with a discrete path configuration. High gain character and homogeneous gain distribution were well preserved with the proposed scheme. Based on the $\mathrm{Nd}\text{:}{\mathrm{GdVO}}_4$ crystal, a 99 W, 12.4 ps ${\mathrm{TEM}}_{00}$ laser output was achieved with a 42% extraction efficiency. The diffraction limited beam quality remained undisturbed after amplification with ${\mathrm{M}}_x^2=1.09$ and ${\mathrm{M}}_y^2=1.07$ in the orthogonal directions.

© 2016 Optical Society of America

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