Sub-kHz linewidth narrowing of a mid-infrared OPO idler frequency by direct cavity stabilization

Abstract

We stabilize the idler frequency of a singly-resonant optical parametric oscillator directly to the resonance of a mid-infrared Fabry-Pérot reference cavity. This is accomplished by the Pound-Drever-Hall locking scheme, controlling either the pump laser or the resonant signal frequency. A residual relative frequency noise power spectral density below 10${}^3$ Hz${}^2$/Hz is reached, with a Gaussian linewidth of 920 Hz over 100 ms, which demonstrates the potential for reaching spectral purity down to the Hz level by locking the optical parametric oscillator against a mid-infrared cavity with state-of-the-art superior performance.

arXiv comment5 pages, 4 figures

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Cited by in corpus (3)

• Self-injection-locked optical parametric oscillator based on microcombs
• Pound-Drever-Hall locking scheme free from Trojan operating points
• 30-Hz relative linewidth watt output power 1.65-$\mu$m continuous-wave singly resonant optical parametric oscillator