Two-photon absorption measurements on InSb, obtained with a single mode hybrid CO 2 laser, have been analysed, taking into account the fact that the laser is Gaussian in space and the effect of free-hole absorption on the temporal profile. The dependence on wavelength of the two-photon coefficient at room temperature (K 2 =8 cm(MW) -1 for 10.6 mu m and K 2 =14 cm(MW) -1 for 9.6 mu m pumping) agrees well with a new calculation including the effect of non-parabolic bands. A similar measurement on Hg 0.78 Cd 0.22 Te (K 2 =14.0 cm(MW) -1 for 10.6 mu m pumping) is consistent with this.
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Miller et al. (1979) studied this question.
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