Abstract

We report stable continuous-wave (CW) ultraviolet (UV) generation at 354.7 nm using single-pass sum-frequency-generation (SFG) of a CW Yb-fiber laser at 1064 nm in the nonlinear crystal, ${\mathrm{BiB}}_3{\mathrm{O}}_6$. The 532 nm radiation is obtained by single-pass second-harmonic generation of the Yb-fiber laser in a 30-mm-long MgO:sPPLT crystal. Using a 10-mm-long ${\mathrm{BiB}}_3{\mathrm{O}}_6$ crystal for SFG, with a measured angular acceptance bandwidth of 0.57 mrad, we generate as much as 68 mW of CW single-frequency UV radiation with a passive power stability better than 3.2% rms over 2 h and frequency stability better than 436 MHz over 2.5 h. The UV output beam has a ${\mathrm{TEM}}_{00}$ spatial profile with $M_x^2<1.6$ and $M_y^2<1.8$.

© 2013 Optical Society of America

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