An effect that is opposite to saturable absorption in the infrared was observed when a CO2laser beam was passed through SF6. An increase of absorption occurred when the radiant flux of the laser was increased to 10 W/cm2. The effect was observed for the P(28) line of the001-100band of the CO2laser, and was attributed to absorption from excited vibrational states of SF6.
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Oppenheim et al. (1971) studied this question.
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