Efficient deep-ultraviolet generation by frequency doubling in β-BaB_2O_4 crystals

Abstract

Efficient and tunable coherent ultraviolet (205-310 nm) generation in beta-BaB(2)O(4) crystals has been studied using Type I phase matching at room temperature. A second-harmonic (SH) -generation efficiency eta of more than 10% was obtained at the SH wavelength lambda(SH) greater, similar 206 nm. The maximum eta was 36% for a fundamental dye-laser power of 150 kW, and eta at lambda(SH) = 310 nm was found to be 4-6 times larger than that in ammonium dihydrogen phosphate.