Suppression of FM-to-AM conversion in third-harmonic generation at the retracing point of a crystal

TL;DR

This paper investigates FM-to-AM conversion in third-harmonic generation using type-II KDP crystals and demonstrates that operating at the retracing point effectively suppresses this conversion, improving system performance.

Contribution

It provides experimental evidence that working at the retracing point reduces FM-to-AM conversion in third-harmonic generation with type-II KDP crystals.

Findings

FM-to-AM conversion is suppressed at the retracing point

Operating at the retracing point improves optical system safety

The study compares effects at and away from the retracing point

Abstract

FM-to-AM conversion can cause many negative effects (e.g., reducing of margin against damage to the optics, and etc.) on performances of third-harmonic conversion system. In this letter, the FM-to-AM conversion effect in third-harmonic generation is investigated both at and away from the retracing point of type-II KDP crystal. Obtained results indicate that the FM-to-AM conversion can be suppressed effectively when the crystal works at the retracing point.