Abstract

Reflectance of lithium triborate crystal in the 6–12-eV region is measured with synchrotron radiation, and the principal values of optical constants are derived. Six absorption peaks are found in both X- and Y-polarized spectra. Among them the five transitions of the Y-polarized peaks and three of the X-polarized peaks are identified. The measurement suggests that the energy of the lowest conducting band 4A2 is 7.3 eV rather than 7.57 eV, as previously reported.

© 1998 Optical Society of America

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