Researchers Develop Temperature-Insensitive Tunable Fabry-Perot Cavity for Atomic Physics Applications
Physicists have designed a piezoelectrically-tunable Fabry-Perot optical cavity that cancels thermal expansion effects near 5°C, achieving fractional frequency instabilities at the 4×10⁻¹³ level over one second. Previously, obtaining both frequency stability and tunability in a single cavity was considered incompatible, forcing researchers to rely on complex external feedback systems. The advance could simplify the engineering of ultra-stable superradiant lasers and cavity quantum electrodynamics experiments by eliminating the need for those external stabilization systems.
Optical Fabry-Perot cavities are widely used in precision metrology and atomic physics, but until now researchers have had to choose between frequency stability and tunability to atomic transitions — two properties rarely achieved simultaneously in one device. The new design, submitted to SciPost and revised in June 2026, uses piezoelectric tuning combined with a material configuration that produces a near-zero coefficient of thermal expansion at approximately 5°C. This thermal cancellation allows the cavity length to remain highly stable without active external feedback, reaching fractional frequency instabilities of 4×10⁻¹³ at one second of integration time. Such stability is competitive with state-of-the-art reference cavities used in metrology, while the piezoelectric element preserves the ability to tune the cavity frequency to atomic transitions. The authors identify superradiant lasers and broader cavity quantum electrodynamics (QED) platforms as primary beneficiaries, where simplified, self-contained cavity systems could reduce experimental complexity and improve reproducibility.
What's missing
The paper is a preprint submitted to SciPost and has not yet completed peer review, so independent experimental validation of the reported stability figures is outstanding.
What different sources said
- arXiv physicsCenter
Temperature-insensitive tunable and stable Fabry-Perot cavity for atomic physics
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