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arXiv · 1807.00853

Simultaneous two-photon resonant optical laser locking (STROLLing) in the hyperfine Paschen--Back regime

Renju S. Mathew·Francisco Ponciano-Ojeda·James Keaveney·Daniel J. Whiting·Ifan G. Hughes
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Abstract

We demonstrate a technique to lock simultaneously two laser frequencies to each step of a two-photon transition in the presence of a magnetic field sufficiently large to gain access to the hyperfine Paschen-Back regime. A ladder configuration with the 5S$_{1/2}$, 5P$_{3/2}$ and 5D$_{5/2}$ terms in a thermal vapour of $^{87}$Rb atoms is used. The two lasers remain locked for more than 24 hours. For the sum of the laser frequencies, which represents the stability of the two-photon lock, we measure a frequency instability of less than the Rb D$_2$ natural linewidth of 6 MHz for nearly all measured time scales

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Renju S. Mathew, Francisco Ponciano-Ojeda, James Keaveney, Daniel J. Whiting, Ifan G. Hughes. 2018-08-23. Simultaneous two-photon resonant optical laser locking (STROLLing) in the hyperfine Paschen--Back regime. https://doi.org/10.1364/ol.43.004204

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