Abstract
We have studied the near-infrared (NIR) absorption and fluorescence spectra of Cr,Ca-doped YAG single-crystal fibers at temperatures of 12 to 290 K. The NIR spectra are attributed to transitions between the 3A2 and 3T2 states of tetrahedral Cr4+. At 12 K the fluorescence spectrum has a sharp electronic transition at 1280 nm and a broad sideband centered at approximately 1400 nm, while the absorption spectrum has only a broad band centered at 1050 nm. The fluorescence lifetime is 42 ± 4 μs at 12 K and 3 ± 1 μs at room temperature. An additional sharp fluorescence line is observed at 1160 nm with a lifetime of 95 ± 5 μs. This line is attributed to a Cr4+ site with a different local perturbation due either to a different placement of the Ca2+ charge compensator or proximity of a Cr3+ or Cr4+.
© 1991 Optical Society of America
PDF ArticleMore Like This
Bo Gu, M. Birnbaum, B. Leong, and M. Bass
WL28 OSA Annual Meeting (FIO) 1989
S. Kück, K. Petermann, and G. Huber
C4L16 Advanced Solid State Lasers (ASSL) 1991
Hergen Eilers, Uwe Hömmerich, Stuart M. Jacobsen, and William M. Yen
ML11 Advanced Solid State Lasers (ASSL) 1993