Frequency locking to a high-finesse Fabry-Perot cavity of a Frequency doubled Nd:YAG laser used as the optical phase modulator

TL;DR

This paper demonstrates stable frequency locking of a frequency-doubled Nd:YAG laser to a high-finesse Fabry-Perot cavity using a modified Pound-Drever-Hall technique, confirming that doubling does not impair laser performance.

Contribution

It introduces a method for locking a frequency-doubled laser to a high-finesse cavity with direct feedback, maintaining laser stability and performance.

Findings

Successful locking of 532 nm beam to cavity

Doubling process does not degrade laser performance

Effective use of modified Pound-Drever-Hall technique

Abstract

We report on the frequency locking of a frequency doubled Nd:YAG laser to a 45 000 finesse, 87-cm-long, Fabry-Perot cavity using a modified form of the Pound-Drever-Hall technique. Necessary signals, such as light phase modulation and frequency correction feedback, are fed direcly to the infrared pump laser. This is sufficient to achieve a stable locking of the 532 nm visible beam to the cavity, also showing that the doubling process does not degrade laser performances.