Theory of Dicke narrowing in coherent population trapping

Details Theory of Dicke narrowing in coherent population trapping Theory of Dicke narrowing in coherent population trapping

2007-01-02

arxiv.org/abs/quant-ph/0701008v2

Phys. Rev. A 76, 013818 (2007)

Physics

Quantum Physics

6 pages, 2 figures; Introduction revised

Scientific paper

10.1103/PhysRevA.76.013818

The Doppler effect is one of the dominant broadening mechanisms in thermal vapor spectroscopy. For two-photon transitions one would naively expect the Doppler effect to cause a residual broadening, proportional to the wave-vector difference. In coherent population trapping (CPT), which is a narrow-band phenomenon, such broadening was not observed experimentally. This has been commonly attributed to frequent velocity-changing collisions, known to narrow Doppler-broadened one-photon absorption lines (Dicke narrowing). Here we show theoretically that such a narrowing mechanism indeed exists for CPT resonances. The narrowing factor is the ratio between the atom's mean free path and the wavelength associated with the wave-vector difference of the two radiation fields. A possible experiment to verify the theory is suggested.

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