
doi: 10.1063/1.90091
We have investigated second harmonic generation (SHG) and sum-frequency mixing (SFG) in deuterated potassium pentaborate using N2 laser pumped dye lasers. The crystal 90° second harmonic generates at 2161.5 Å with a power conversion efficiency of 5% at an input power of 15 kW. Tunable phase-matched VUV SFG is observed from 2161.5 to 1962.4 Å. Transmission and birefringence measurements indicate that the crystal can phase match with high conversion efficiencies to below 1700 Å.
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