Optoacoustic detection of multiple photon molecular absorption in a strong IR field |
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Authors: | VN Bagratashvili IN Knyazev VS Letokhov VV Lobko |
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Institution: | Institute of Spectroscopy, Academy of Sciences USSR, Podol''skii rayon, 142092 Moscow, USSR |
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Abstract: | A new method based on the optoacoustic effect has been proposed to measure multiple photon absorption at vibrational molecular transitions in a strong IR laser field. Comparison measurements of the average absorbed energy have been done by this method for molecules with different dissociation limits in a strong CO2-laser field, the field intensity changed therewith by four orders. For the poly-atomic molecules C2H4 and SF6 having a comparatively low dissociation limit, the absorption increases monotonously as the power density of laser radiation P increases up to the dissociation limit. For three-atom molecules, such as D2O and OCS, absorption saturation takes place with P ? 10 MW/cm2. |
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