Compact plug and play optical frequency reference device based on Doppler-free spectroscopy of rubidium vapor
A. Strangfeld1,2, B. Wiegand1, J. Kluge1,2, M. Schoch1, and M. Krutzik1,2
Opt. Express, vol. 30, no. 7, pp. 12039-12047, doi:10.1364/OE.453942 (2022).
Compactness, robustness and autonomy of optical frequency references are prerequisites for reliable operation in mobile systems, on ground as well as in space. We present a standalone plug and play optical frequency reference device based on frequency modulation spectroscopy of the D2-transition in rubidium at 780 nm. After a single button press the hand-sized laser module, based on the micro-integrated laser-optical bench described in [J. Opt. Soc. Am. B 38, 1885 (2021)], works fully autonomous and generates 6 mW of frequency stabilized light with a relative frequency instability of 1.4×10-12 at 1 s and below 10-11 at 105 s averaging time. We describe the design of the device, investigate the thermal characteristics affecting the output frequency and demonstrate short-term frequency stability improvement by a Bayesian optimizer varying the modulation parameters.
1 Department of Physics, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany
2 Ferdinand-Braun-Institut (FBH), Gustav-Kirchhoff-Str. 4, 12489 Berlin, Germany
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