THE SUPERPOSITION OF ONE-PHONON AND 2-PHONON ABSORPTION AND RADIATIONIN TEO2 CRYSTAL

Raman scattering and IR reflectivity for actual configurations have be en investigated. The contours of reflectivity spectra have been calcul ated. Phonon parameters have been determined. The temperature dependen ce of Raman scattering and IR reflectivity indicated absence of soft m odes in optical oscillations. Two-phonon processes of light absorption and radiation have been investigated. In the one-phonon mode frequenc y range, a two-phonon radiation which is completely absorbed by the cr ystal itself has been observed.