An ultra-stable laser based on a room-temperature optical cavity with crystalline coatings

Dequan Kong; Xingyang Cui; Xianqing Zhu; Haiwei Yu; Xiao Jiang; Ping Xu; Hanning Dai; Yuan Chen; Jianwei Pan

doi:10.1117/12.3008077

24 November 2023 An ultra-stable laser based on a room-temperature optical cavity with crystalline coatings

Dequan Kong, Xingyang Cui, Xianqing Zhu, Haiwei Yu, Xiao Jiang, Ping Xu, Hanning Dai, Yuan Chen, Jianwei Pan

Proceedings Volume 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023); 129354P (2023) https://doi.org/10.1117/12.3008077
Event: Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 2023, Xi’an, China

Abstract

At present, most ultra-stable lasers are locked onto the optical cavity through Pound-Drever-Hall (PDH) technology, but the frequency instability of the locked laser is often limited by the thermal noise limit of the reference cavity. It can mainly be reduced by increasing the cavity length, or operating at cryogenic temperatures. Here, we present an ultra-stable laser based on a 30-cm-long room temperature cavity. The cavity consists of an ultralow expansion (ULE) glass spacer and fused silica (FS) mirrors with Al_0.92Ga_0.08As/GaAs crystalline coatings. A 1396.9-nm laser is stabilized on this cavity and a periodically poled lithium niobate (PPLN) waveguide is used to obtain 698.45 nm light for the strontium atomic clock by second harmonic generation (SHG). Technical noise contributions are estimated by beating another 698nm ultra-stable laser system based on a commercial 30-cm-long cavity. The zero-coefficient thermal expansion (zero-CTE) temperature of the cavity is about 266.2 K, and the time transport constant is 1.2×10⁶ s. The total noise is the sum of all estimated noise contributions and the short-term frequency stability mainly dominated by the vibration noise. The evaluation of total noise is close to the frequency instability of the 1×10⁻¹⁶ at the 1 s average time.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Dequan Kong, Xingyang Cui, Xianqing Zhu, Haiwei Yu, Xiao Jiang, Ping Xu, Hanning Dai, Yuan Chen, and Jianwei Pan "An ultra-stable laser based on a room-temperature optical cavity with crystalline coatings", Proc. SPIE 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 129354P (24 November 2023); https://doi.org/10.1117/12.3008077

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KEYWORDS

Crystals

Laser frequency

Optical coatings

Laser stabilization

Vibration

Laser systems engineering

Laser crystals

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