Abstract

Lanthanum lutetium gallium garnet of the compositions ${\mathrm{La}}_{2.32}{\mathrm{Lu}}_{2.61-x}{\mathrm{Cr}}_x{\mathrm{Ga}}_{3.07}{\mathrm{O}}_{12}$ and ${\mathrm{La}}_{2.7}{\mathrm{Lu}}_{2.3-x}{\mathrm{Cr}}_x{\mathrm{Ga}}_{3.07}{\mathrm{O}}_{12}$ with various chromium concentrations was grown by the Czochralski method. We measured the luminescence, absorption excitation, and excited-state absorption spectra. Two different octahedrally coordinated low field ${\mathrm{Cr}}^{3+}$ centers were found in crystals of both compositions. In the ${\mathrm{La}}_{2.7}{\mathrm{Lu}}_{2.3-x}{\mathrm{Cr}}_x{\mathrm{Ga}}_{3.07}{\mathrm{O}}_{12}$ crystals an additional absorption found in the region 13 000–16 000 cm^-1 is attributed to the tetrahedrally coordinated ${\mathrm{Cr}}^{4+}$ system.

© 2003 Optical Society of America

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