THE OPTICAL-PROPERTIES OF SOME BORATE GLASSES

The optical properties of potassium borate and sodium borate glasses are presented. The fundamental absorption edge for all the series of glasses were analysed in terms of the theory of Davis and Mott. The position of absorption edge and hence the value of the optical gap, was found to depend on the semiconducting glass composition, and the absorption in these glasses is believed to be associated with indirect transitions. The infrared spectra were recorded and appeared individually similar, which is consistent with the absence of significant structural change between the various glass specimens.