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Ultrastable lasers: investigations of crystalline mirrors and closed cycle cooling at 124 K

https://doi.org/10.1088/1742-6596/2889/1/012055

Ma, C Y; Yu, J; Legero, T; Herbers, S; Nicolodi, D; Kempkes, M; Riehle, F; Kedar, D; Robinson, J M; Ye, J; et al (November 2024, Journal of Physics: Conference Series)

Abstract We have investigated crystalline AlGaAs/GaAs optical coatings with three ultra-stable cavities operating at 4 K, 16 K, 124 K and 297 K. The response of the cavities’ resonance frequencies to variations in optical power indicates non-thermal effects beyond the photo-thermo-optic effect observed in dielectric coatings. These effects are strongly dependent on the intensity of the intracavity light at 1.5 μm. When the rear side of the mirrors is illuminated with external light, we observe a prominent photo-modified birefringence for photon energies above the GaAs bandgap, which points to a possible mechanism relating our observations to the semiconductor properties of the coatings. Separately, we also present a low maintenance evolution of our 124 K silicon cavity system where the liquid nitrogen based cooling system is replaced with closed cycle cooling from a pulse-tube cryo-cooler.
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Free, publicly-accessible full text available November 1, 2025
Demonstration of 4.8 × 10−17 stability at 1 s for two independent optical clocks

https://doi.org/10.1038/s41566-019-0493-4

Oelker, E.; Hutson, R. B.; Kennedy, C. J.; Sonderhouse, L.; Bothwell, T.; Goban, A.; Kedar, D.; Sanner, C.; Robinson, J. M.; Marti, G. E.; et al (October 2019, Nature Photonics)

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Ultrastable Silicon Cavity in a Continuously Operating Closed-Cycle Cryostat at 4 K

https://doi.org/10.1103/PhysRevLett.119.243601

Zhang, W.; Robinson, J. M.; Sonderhouse, L.; Oelker, E.; Benko, C.; Hall, J. L.; Legero, T.; Matei, D. G.; Riehle, F.; Sterr, U.; et al (December 2017, Physical Review Letters)
$1.5 μ m$ Lasers with Sub-10 mHz Linewidth

https://doi.org/10.1103/PhysRevLett.118.263202

Matei, D. G.; Legero, T.; Häfner, S.; Grebing, C.; Weyrich, R.; Zhang, W.; Sonderhouse, L.; Robinson, J. M.; Ye, J.; Riehle, F.; et al (June 2017, Physical Review Letters)

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A Fermi-degenerate three-dimensional optical lattice clock

https://doi.org/10.1126/science.aam5538

Campbell, S. L.; Hutson, R. B.; Marti, G. E.; Goban, A.; Darkwah Oppong, N.; McNally, R. L.; Sonderhouse, L.; Robinson, J. M.; Zhang, W.; Bloom, B. J.; et al (October 2017, Science)

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