Two-Photon Spectroscopy

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Background

When certain materials are bombarded with very intense light they are able to able to absorb two lower power photons and enter an excited state. The electron quickly jumps back down from the higher energy level and releases energy as light in fluorescence. The sample is excited by light of one wavelength while fluorescing at a different wavelength.

See complete wiki article Two Photon Absorption

Operation

TPA with the reference sample method


TPA with well characterized beam

This is a typical optical table setup for a two photon spectroscopic study. The particular arranged of the light path is dependent on the lab but the basic components would be the same.

<swf width= "640" height="480">http://depts.washington.edu/cmditr/media/twophotonspec.swf</swf>

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External Links ===

See also SPIE Optipedia Mode Locking

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