Optoacoustic studies of two-frequency infrared-laser pumping of SF(6)

Optoacoustic spectroscopy of the multiple-photon, two-frequency infrared-laser pumping of SF(6) 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 V(2) + V(6) mode in SF(6) after excitation in the v(3) mode.