Abstract

Lanthanum lutetium gallium garnet of the compositions La2.32Lu2.61-xCrxGa3.07O12 and La2.7Lu2.3-xCrxGa3.07O12 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 Cr3+ centers were found in crystals of both compositions. In the La2.7Lu2.3-xCrxGa3.07O12 crystals an additional absorption found in the region 13 000–16 000 cm-1 is attributed to the tetrahedrally coordinated Cr4+ system.

© 2003 Optical Society of America

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