Sub-kHz-level relative stabilization of an intracavity doubled continuous wave optical parametric oscillator using Pound-Drever-Hall scheme

TL;DR

This paper demonstrates sub-kHz-level stabilization of an intracavity doubled optical parametric oscillator's output using Pound-Drever-Hall locking, achieving high frequency stability for orange light.

Contribution

It introduces a method to stabilize the frequency of intracavity doubled OPOs with Pound-Drever-Hall locking, reducing frequency noise to sub-kHz levels.

Findings

Relative frequency noise of 700 Hz integrated from 1 Hz to 50 kHz.

Frequency noise transfer from pump laser to non-resonant signal.

Effective stabilization of orange radiation via intracavity frequency doubling.

Abstract

We report the relative frequency stabilization of an intracavity frequency doubled singly resonant optical parametric oscillator on a Fabry-Perot\'etalon. The red/orange radiation produced by the frequency doubling of the intracavity resonant idler is stabilized using the Pound-Drever-Hall locking technique. The relative frequency noise of this orange light, when integrated from 1 Hz to 50 kHz, corresponds to a standard deviation of 700 Hz. The frequency noise of the pump laser is shown experimentally to be transferred to the non resonant signal beam.