Abstract

We demonstrate a 0.56-GW, 1-kHz, 4.2-ps, 2.74-mJ deep-ultraviolet (DUV) laser at $\sim 257.7\mathrm{nm}$ with a beam propagation factor (${\mathrm{M}}^2$) of $\sim 2.54$ from a frequency-quadrupled cryogenic multi-stage Yb-doped chirped-pulse amplifier. The frequency quadrupling is achieved using ${\mathrm{LiB}}_3{\mathrm{O}}_5$ and $\beta \text{-}{\mathrm{BaB}}_2{\mathrm{O}}_4$ crystals for near-infrared (NIR)-to-green and green-to-DUV conversion, respectively. An overall NIR-to-DUV efficiency of $\sim 10\%$ has been achieved, which is currently limited by the thermal-induced phase mismatching and the DUV-induced degradation of transmittance. To the best of our knowledge, this is the highest peak-power picosecond DUV source from a diode-pumped solid-state laser operating at kHz repetition rates.

© 2015 Optical Society of America

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