Frequency stabilization of the non resonant wave of a continuous-wave singly resonant optical parametric oscillator

TL;DR

This paper introduces an experimental method to stabilize the frequency of the non-resonant wave in a singly resonant optical parametric oscillator, achieving kHz-level stability below pump noise.

Contribution

The authors demonstrate a technique to stabilize the non-resonant wave frequency in a SRO by referencing it to a cavity, effectively reducing pump noise influence.

Findings

Non-resonant wave frequency stabilized to kHz level

Pump noise imposition on resonant wave used for stabilization

Achieved powerful, frequency-stable non-resonant wave

Abstract

We present an experimental technique allowing to stabilize the frequency of the non resonant wave in a singly resonant optical parametric oscillator (SRO) down to the kHz level, much below the pump frequency noise level. By comparing the frequency of the non resonant wave with a reference cavity, the pump frequency noise is imposed to the frequency of the resonant wave, and is thus subtracted from the frequency of the non resonant wave. This permits the non resonant wave obtained from such a SRO to be simultaneously powerful and frequency stable, which is usually impossible to obtain when the resonant wave frequency is stabilized.