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High-performance, compact optical standard
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DOI：10.1364/OL.435603.png)
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Abstract
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We describe a high-performance, compact optical frequency standard based on a microfabricated Rb vapor cell and a low-noise, external cavity diode laser operating on the Rb two-photon transition at 778 nm. The optical standard achieves an instability of 1.8 x 10(-13)tau(-1/2) for times less than 100 s and a flicker noise floor of 1 x 10(-14) out to 6000 s. At long integration times, the instability is limited by variations in optical probe power and the ac Stark shift. The retrace was measured to 5.7 x 10(-13) after 30 h of dormancy. Such a simple, yet high-performance optical standard could be suitable as an accurate realization of the meter or, if coupled with an optical frequency comb, as a compact atomic clock comparable to a hydrogen maser. (C) 2021 Optical Society of America
Keywords:
ABSOLUTE FREQUENCY-MEASUREMENT
2-PHOTON TRANSITION
LASER
RUBIDIUM
STABILITY
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3.3
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4.0W
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7.6W
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