Abstract

Optoacoustic spectroscopy of the multiple-photon, two-frequency infrared-laser pumping of SF6 shows that under certain conditions the absorption cross section can be increased by a factor of 40 or more over the single-frequency case. It is also shown that at a certain level of excitation, the cross section for absorption of the second laser frequency is independent of further excitation. Further, an enhancement was seen in the absorption at the ν2 + ν6 mode in SF6 after excitation in the ν3 mode.

© 1979 Optical Society of America

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