Stabilizing an optical cavity containing a bulk diamond crystal at millikelvin temperatures in a cryogen-free dilution refrigerator

Abstract:We successfully stabilized a Fabry-Pérot optical cavity incorporating a bulk diamond crystal at millikelvin temperatures in a cryogen-free dilution refrigerator with the pulse-tube cryocooler running. In stark contrast to previous demonstrations where lasers were locked to the cavities, our setup locks the cavity to a laser. Our measurements of cavity length fluctuation suggest that the setup could stabilize a cavity up to a finesse of $1.2\times 10^4$ without the diamond and $5.8 \times10^3$ with the diamond crystal. The finesse with a diamond crystal of approximately 90 is primarily limited by the absorption loss inside the diamond.

Quantum Physics (quant-ph); Instrumentation and Detectors (physics.ins-det); Optics (physics.optics)

arXiv:2501.18938 [quant-ph]

(or arXiv:2501.18938v2 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2501.18938 Focus to learn more arXiv-issued DOI via DataCite

Rev. Sci. Instrum. 96, 085201 (2025)

https://doi.org/10.1063/5.0265492 Focus to learn more DOI(s) linking to related resources

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