Abstract

We have developed a high-power ultraviolet (UV) nanosecond-pulsed laser based on a rod-type photonic crystal fiber. The UV pulse energy and the pulse repetition rate are 0.75 mJ and 100 kHz, respectively, yielding 75-W UV average power. The temporal pulse shape and the linewidth of a 1030-nm seed laser are optimized for efficient third-harmonic generation, and the high conversion efficiency of 50% is achieved with a good beam quality (${{\rm{M}}^2}\sim {1.2}$). To our knowledge, this is the highest UV pulse energy from fiber lasers.

© 2021 Optical Society of America

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