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Bichromatic spectroscopy of coherent population trapping resonances with phase‐locked fields
Author(s) -
Akimov A. V.,
Matveev A. N.,
Sokolov A. V.,
Sorokin V. N.,
Kanorsky S. I.,
Kolachevsky N. N.
Publication year - 2005
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1290
Subject(s) - femtosecond , laser , atomic physics , rubidium , excited state , physics , trapping , terahertz radiation , spectroscopy , population , phase (matter) , optics , chemistry , ecology , demography , organic chemistry , potassium , quantum mechanics , sociology , biology
We propose a new approach to the study of coherent population trapping (CPT) resonances using a phase‐coherent bichromatic light source based on a mode‐locked femtosecond laser as an intermediate frequency coupler. The source consists of two diode lasers tuned to the rubidium D 2 line (780 nm) which are phase locked to different longitudinal modes of a femtosecond laser MIRA‐900F with 75 MHz repetition rate. Using this bichromatic source with a stable differential frequency, we excited and investigated the CPT resonances in the three‐level system 5s S 1/2 ( F = 2) ↔ 5s P 3/2 ( F = 2) ↔ 5s S 1/2 ( F = 3) of the 85 Rb atom. Potentially, this method opens up the possibility of coherently exciting Raman transitions with differential frequencies up to hundreds of terahertz. Copyright © 2005 John Wiley & Sons, Ltd.