Design and Construction of Bow-Tie Cavity for the Generation of Deep Ultraviolet Light

A wide range of laser frequencies are needed in the field of quantum optics as well as in condensed matter physics. Due to limited availability of laser frequencies in the market, usually non-linear optical processes such as second harmonic generation (SHG) or sum frequency generation (SFG) are used to produce desired wavelengths. We have designed and built a bow-tie cavity for SHG of continuous-wave (cw) 266 nm light from 532 nm green laser by using a phase-matched and Brewster-cut beta barium borate. The conversion efficiency of about 1.72×10^-2 /W for fundamental light to SHG light was observed. The generated SHG light will be mixed with a tunable infrared laser light in a separate SFG cavity to produce cw deep ultraviolet light to be used for angle-resolved photoelectron spectroscopy.