title: Spectroscopic properties of Cr(4+):Lu(3)Al(5)O(12).
abstract: We report on the near-infrared absorption, emission, and lifetime data of Cr(4+):Lu(3)Al(5)O(12) (Cr:LAG) and compare the results with the known laser material Cr(4+)-doped Y(3)Al(5)O(12) (Cr:YAG). Lu(3)Al(5)O(12) has a smaller unit cell than Y(3)Al(5)O(12), 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 micros (Cr:YAG, 30.6 micros) and at 300 K is 4.3 micros (Cr:YAG, 3.5 micros). 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.
authors.forename: H
authors.initials: H
authors.lastname: Eilers
authors.forename: U
authors.initials: U
authors.lastname: Hömmerich
authors.forename: S M
authors.initials: SM
authors.lastname: Jacobsen
authors.forename: W M
authors.initials: WM
authors.lastname: Yen
authors.forename: M
authors.initials: M
authors.lastname: Kokta