Abstract

${\rm{BaMg}}{{\rm{F}}_4}$ is a ferroelectric nonlinear crystal with a very wide transparency window ranging from 125 nm to $13\;\unicode{x00B5}{\rm m}$ of the wavelength. Therefore, it is a candidate material to generate ultraviolet or deep ultraviolet laser, which is very important in lithography, semiconductor manufacturing, and advanced instrument development. Here, the second-order birefringence phase-matching processes of the ${\rm{BaMg}}{{\rm{F}}_4}$ crystal were studied, including second-harmonic generation (SHG) and sum-frequency generation (SFG). In the experiments, we measured the phase-matching angle, nonlinear frequency conversion efficiency, and angle bandwidth of SHG and SFG processes of ${\rm{BaMg}}{{\rm{F}}_4}$ crystal, which are in well agreement with the theoretical calculations. This study may promote the research of nonlinear optical process of ${\rm{BaMg}}{{\rm{F}}_4}$ crystal and also the further development of all-solid-state vacuum ultraviolet lasers.

© 2021 Optical Society of America

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