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The possibilities for nonlinear optics in proustite have been explored in a wavelength region previously indicated as having low absorption. We used a 10-W CW CO2laser oscillating on a single transition at 9.2-μ wavelength. The observed values for nonlinearity and absorption are, respectivley,(7.9 ± 2.0) × 10⁻²³in MKS units and 0.29 cm-1.
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Ernst et al. (1972) studied this question.
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