Abstract
The absorption of CO 2 laser pulses by low pressure SF 6 gas has been investigated over a wide range of energy fluxes. For laser energy fluxes of 0.01–1 J cm -2 the effective absorption cross section varies between 0.2 and 2 × 10 -18 cm 2. For each laser line an individual dependence on the energy is found and in some cases minor changes in the absorption behaviour seem to occur around 0.1 J cm -2. SF 6 excited with an average vibrational energy content of up to 20 photons/molecule does not absorb measurable amounts of 9.4 μm laser light. The influence of various SF 6 and Ar pressures on the temporal shape of the transmitted pulses has been investigated.
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