Abstract
We report the development of a method for eliminating background-induced systematic shifts affecting precise measurements of saturation absorption signals. With this technique, we measured the absolute frequency of the 6s2 1S0 → 6s6p 3P1 transition in 201aHg (F = 3/2 → F′ = 5/2) to be 1181541111051(83) kHz. The measurement was referenced with an optical frequency comb synchronized to the frequency of the local representation of the UTC. This specific atomic line is situated on the steep slope of the Doppler background at room temperature, which results in a frequency systematic shift. We determined the dependence of this shift on the properties of both the spectral line and the background of the measured signal.
Funder
Narodowe Centrum Nauki
European Metrology Programme for Innovation and Research
Subject
Atomic and Molecular Physics, and Optics
Cited by
1 articles.
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1. Dual-Wavelength Ultra-Stable Optical Cavity;2023 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS);2023-05-15