355 nm Ultraviolet Nanosecond Lasers Produced by Frequency Doubling in K3B6O10Br Nonlinear Optical Crystal

Abstract

We demonstrate a 355 nm ultraviolet nanosecond laser produced by the type I phase-matched frequency doubling in a K3B6O10Br (KBOB) nonlinear optical crystal. The use of 5022 μJ, 710 nm pump pulses at 10 Hz repetition rate produces 4.273 ns, 355 nm, 717 μJ pulses that corresponds to a frequency doubling conversion efficiency of 14.3%. The energy instability of the frequency-doubled pulse train measured is less than ±1% for maximum output pulse energy (∼717 μJ). Our experimental results show that KBOB is a promising nonlinear optical crystal for generating ultraviolet nanosecond laser pulses through frequency doubling.