Abstract

The refractive index dispersion in β-Tl1 − xCuxInS2 (0 ≤ x ≤ 0.015) crystals has been studied using intrinsic interference. It is shown that these crystals are characterized by anomalous-dispersion regions at wavelengths slightly exceeding those corresponding to exciton peaks. It is established that, using intrinsic interference, one can detect excitons in these crystals at room temperature. Modulation of interference patterns is revealed, and explanation of this phenomenon is proposed.

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