Design of High Energy Single Longitudinal Mode 355 nm UV Laser

Abstract

355 nm laser is a widely applied light source, of which the two features mostly used are the damaging effect and propagation characteristic in the atmosphere. Thus, higher laser energy has always been required to perform better damage and provide further propagation range. We demonstrate high energy single longitudinal ultraviolet (UV) laser using a nonlinear optical crystal of lithium triborate (LBO) cut at θ=90° and φ= 37° with sizes of 10 mm × 10 mm × 30 mm in type I phase-matching, the source light from a single longitudinal mode (SLG) inject master oscillator power amplifier (MOPA) operated at a repetition rate of 5 Hz with a pulse duration of 10 ns. The maximum output energy of 0.308 J of 355 nm UV laser was reached through a total pump energy of 1.82 J 1064 nm and 532 nm laser with an nonlinear conversion efficiency of 16.9%. The experimental results prove that the LBO crystal is a reliable candidate for high-energy UV laser generation. The output high energy 355 nm laser has great application potential in material processing, microchip manufacturing and remote sensing.