Düsseldorf 2007 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 73: Laserspektroskopie II
Q 73.3: Talk
Friday, March 23, 2007, 14:30–14:45, 5K
Doppler-Free Spectroscopy of Lines in the X1A1→ A1A2 Transition of Formaldehyde — •Martin Zeppenfeld, Michael Motsch, Pepijn W. H. Pinkse, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans Kopfermann Str. 1, 85748 Garching, Germany
One of the main obstacles to measuring optical molecular spectra at the natural linewidth is Doppler broadening. Doppler spreading can be circumvented using saturation spectroscopy, but applying this method to weak transitions can be a significant challenge. We employ a number of experimental techniques to obtain Doppler-free signals of lines in the X1A1→ A1A2 transition. These include reduction of the laser beam diameter, use of a multi-pass cell and frequency modulation.
We have also developed a theoretical model to understand the observed height of our Doppler-free signals. Such a model must take into account spatial distribution of laser beam intensity, which has been neglected in previous models. We introduce the model and demonstrate its verification in our formaldehyde experiment. Comparison between theory and experiment allows us to obtain information about the molecular properties.