Power Dependent Lineshape Corrections for Quantitative Spectroscopy

Details Power Dependent Lineshape Corrections for Quantitative Spectroscopy Power Dependent Lineshape Corrections for Quantitative Spectroscopy

2012-03-13

arxiv.org/abs/1203.2828v1

Physics

Atomic Physics

4 pages, 3 figures

Scientific paper

The Voigt profile - a convolution of a Gaussian and a Lorentzian - accurately describes the absorption lines of atomic and molecular gases at low probe powers. Fitting such to experimental spectra yields both the Lorentzian natural linewidth and the Gaussian Doppler broadening. However, as the probe power increases saturation effects introduce spurious power dependence into the fitted Doppler width. Using a simple atomic model, we calculate power-dependent corrections to the Voigt profile, which are parametrized by the Gaussian Doppler width, the Lorentzian natural linewidth, and the optical depth. We show numerically and experimentally that including the correction term substantially reduces the spurious power dependence in the fitted Gaussian width.

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