Abstract

Using the natural properties of the lamellar compounds, the ordinary refractive index of GaSe has been induced from interferential patterns of transmission and reflection spectra in the low absorption range and from reflectivity spectra in the polar modes range. An analytic development of the refractive index vs energy can reproduce the measured values of this index and provides the energy gap in the visible range, and values for ωLO and ωTO in the ir range ∊ have been used as a parameter to get this fitting.

© 1977 Optical Society of America

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