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 $4A_2$ is 7.3 eV rather than 7.57 eV, as previously reported.

© 1998 Optical Society of America

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