Effects of modulation on signals obtained in saturated absorption spectroscopy experiments |
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Authors: | B. Couillaud A. Ducasse A. Dienes |
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Affiliation: | (1) Centre de Physique Moléculaire, Optique et Hertzienne, Laboratoire associé au C.N.R.S., Université de Bordeaux I, F-33405 Talence, France;(2) Present address: Dept. of Electrical Engineering, University of California, Davis, Davis, California, USA |
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Abstract: | An analysis of the useful signals detected in saturated absorption spectroscopy experiments is given. Both Gaussian and plane-wave fields are considered. The various cases of unmodulated, square-wave modulated and sinusoidally modulated saturating beams are examined. It is found that square-wave and sinusoidal modulations give different results. The first is identical to no modulation, and detection at the fundamental frequency records a fraction of the total signal which is also a square wave. The second gives fundamental or higher-harmonic signals each with a very different dependence on the saturation parameter. The signal at the fundamental saturates faster and more completely than that for square-wave modulation. The results suggest experimental methods for the determination of the absolute value of the saturation parameter. |
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Keywords: | 07.65 |
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