YAG Laser And Multi-Photon Absorption

By Derek Kverno and Jim Nolen

Abstract:

    In 1929, Maria Göpert-Mayer predicted that an atom could be excited to a higher energy state by absorbing multiple photons simultaneously.  Her prediction, which was completely theoretical, could not be fully investigated for some time, however, because there was no available light source intense enough to cause any appreciable effect of multi-photon absorption.  With the invention of the laser in 1960, multi-photon absorption could then be easily observed in a variety of substances.  In this experiment, we use a Nd-YAG laser and CW Dye laser to examine two-photon absorption in Cesium atoms.  We also observe and discuss the related phenomenon of Raman Scattering.

Table of Contents:

1. Theory: Multi-photon absorption and Raman Scattering 
2. Data
3. Energy Levels
4. Procedure and Aparatus

References:

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• Demtröder, Wolfgang.  Laser Spectroscopy.  New York: Springer, 1996.
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• Hazel, T.P, et.al. "Classical View of the Properties of Rydberg Atoms: Application of the Correspondence Principle."  American Journal of Physics.  Vol 60. No. 4.  April 1992. pp 329-335.
• Moore, Charlotte E.  Atomic Energy Levels. Vol II.  U.S. Department of Commerce. National Bureau of Standards. December, 1971.
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