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In conjunction with studies relating to high-power CO2 laser windows the linear absorption coefficient α of Cr-doped GaAs was measured by means of calorimetric techniques. It was found that α ≈ 0.02 cm−1, at room temperature. This result is shown to be consistent with theoretical considerations: At 10.6 μ, the lattice absorption of GaAs stems from the existence of a fourth-order electric moment and does not involve the fundamental resonance.
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Klein et al. (1968) studied this question.
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