Abstract

We report on the near-infrared absorption, emission, and lifetime data of Cr4+:Lu3Al5O12 (Cr:LAG) and compare the results with the known laser material Cr4+-doped Y3Al5O12 (Cr:YAG). Lu3Al5O12 has a smaller unit cell than Y3Al5O12, and this feature is reflected in its spectroscopic properties. The low-temperature luminescence spectrum is shifted by 85 cm−1 to higher energy compared with Cr:YAG. The luminescence lifetime of Cr:LAG at 10 K is 28.7 μs (Cr:YAG, 30.6 μs) and at 300 K is 4.3 μs (Cr:YAG, 3.5 μs). From these lifetimes we postulate that the quantum efficiency in Cr:LAG is higher than in Cr:YAG. We discuss the potential of Cr:LAG as a tunable near-infrared laser.

© 1993 Optical Society of America

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