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Measurement of excited-state transitions in cold calcium atoms by direct femtosecond frequency-comb spectroscopy

Published

Author(s)

Jason Stalnaker, Yann LeCoq, Tara M. Fortier, Scott A. Diddams, Christopher W. Oates, Leo W. Hollberg

Abstract

We apply direct frequency-comb spectroscopy, in combination with precision cw spectroscopy, to measure the 4s4p3P1 – 4s5s transition frequency in cold calcium atoms. An 657 nm ultrastable cw laser was used to excite atoms on the narrow (γ {approximately) 400 Hz)4s21S0 – 4s4p 3P1 clock transition, and the direct output of the frequency comb was used to excite those atoms from the 4s4p3P1 state to the 4s5s3S1 state. The resonance of the second stage was detected by observing a decrease in population of the ground state as a result of atoms being optically pumped to the meta-stable 4s4p3P0,2 states. The 4s4p3P1 – 4s5s3S1 transition frequency is measured to be Ņ= 489 544 285 713(56) kHz; an improvement of almost four orders of magnitude over the previously measured value. In addition, we demonstrate spectroscopy on magnetically trapped atoms in the 4s4p3P2 state.
Citation
Physical Review A (Atomic, Molecular and Optical Physics)
Volume
75

Keywords

calcium, cold atoms, direct frequency comb spectroscopy, mode-locked lasers, optical frequency measurement

Citation

Stalnaker, J. , LeCoq, Y. , Fortier, T. , Diddams, S. , Oates, C. and Hollberg, L. (2007), Measurement of excited-state transitions in cold calcium atoms by direct femtosecond frequency-comb spectroscopy, Physical Review A (Atomic, Molecular and Optical Physics), [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50486 (Accessed June 24, 2024)

Issues

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Created April 6, 2007, Updated February 17, 2017