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Journal of Luminescence

Demonstration of four wave mixing line narrowing spectroscopy - the nonlinear analogue of fluorescence line narrowing

Michael T. Riebe, John Curtis Wright

Published Feb 1, 1988• 3 citations
Publisher
DOI
10.1016/0022-2313(88)90324-9

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We theoretically examine thickness and wavelength dependence line-shape of four-wave-mixing (FWM) spectroscopy in micrometric thin atomic vapors whose thickness LLL is assumed to be 10,30,50,80 and 100 μ\muμm respectively. It is found that a narrow centre (Dicke-narrowing) persists for all cases, while wings are broadened as the thickness of the vapor increases or the pump wavelength decreases comparing to the probe wavelength. This type of spectrum is due to the modified velocity distribution and polarization interference from different ensemble of atoms in a confined situation.