A fast measurement method of detuning angles of laser frequency converter

Abstract

A frequency converter is usually used in high-power laser facilities to triple the frequency of the incident laser. It consists of a KDP crystal and a KD*P crystal in series. The measurement of the detuning angles of the frequency converter is essential for improving the frequency conversion efficiency. In this paper, we propose a measurement method that uses a diverging beam to illuminate the frequency converter and get the detuning angles by analyzing the light intensity distribution of the third harmonic laser. The simulated results show that there is a strict linear relationship between the characteristic parameters and the detuning angles of frequency converter, verifying the feasibility of this method. Compared with existing measurement methods, its optical path is simple, and the single measurement time can be shortened to a few minutes from a few hours.