Abstract
Excitonic reflection spectra of CuAlSe2 crystals were studied at 10 K. The spectral dependences of refractive indicesno andne were calculated. The isotropic wavelength (the point of intersection ofno andne) in the excitonic region was determined. The spectral dependence ofΔn = no − ne was studied on the long-wavelength and short-wavelength sides of the isotropic wavelength ofCuGaxAl1 − xSe2 crystals. Up to 15 narrow transmission (absorption) lines were revealed in the interferencespectra of thin crystals, which can be used for the development of comb filters.
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