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A comprehensive metrological framework for performance evaluation of an ultra-stable cavity-laser system
Weixin Ma1,2, Qi Luo1,2, Chonghao Ma1,2
1State Key Laboratory of Quantum Optics Technologies and Devices, Shanxi University, Taiyuan 030006, China.
The Review of Scientific Instruments
|December 4, 2025
Summary
We developed a precise metrological framework to characterize ultra-low expansion optical cavities. This system accurately measures key parameters like free spectral range (FSR) and finesse, crucial for high-performance lasers.
Area of Science:
- Optics and Photonics
- Laser Physics
- Metrology
Background:
- Ultra-low expansion optical cavities are essential for high-performance lasers.
- Cavity performance depends on parameters like free spectral range (FSR), finesse, zero-crossing temperature (ZCT), linewidth, and phase noise.
Purpose of the Study:
- To implement an integrated metrological framework for precise characterization of a homemade cavity-laser system.
- To accurately determine key performance parameters of the optical cavity.
Main Methods:
- Free spectral range (FSR) determined using radio frequency modulation sideband technique.
- Finesse measured via cavity ring-down spectroscopy.
- Zero-crossing temperature (ZCT) identified using scanning confocal Fabry-Pérot interferometry referenced to a stabilized He-Ne laser.
- Laser linewidth and phase noise quantified using short-delay self-heterodyne interferometry.
Main Results:
- Achieved precise measurements of FSR (1496.8867(3) MHz) and finesse (89350(380)).
- Determined ZCT to be 56.96(17)°C and narrowed laser linewidth to 229(28) Hz.
- Demonstrated a systematic toolkit for assessing ultra-stable cavity-laser systems.
Conclusions:
- The developed metrological framework enables high-precision characterization of optical cavities.
- The study provides a comprehensive assessment of a homemade cavity-laser system's performance.
- This work establishes a valuable toolkit for advancing ultra-stable laser technologies.
