Spectroscopic Evaluation Of Cayalo4 Doped With Trivalent Er, Tm, Yb And Ho For Eyesafe Laser Applications
Abbreviated Journal Title
RARE-EARTH IONS; CRYSTAL-FIELD ANALYSIS; ENERGY-LEVELS; CANDALO4; SPECTRA; YAG; ND; Materials Science, Multidisciplinary; Optics
Spectroscopic properties of relevance for laser applications have been studied for rare earths in CaYAlO4. Fitting of a theoretical model to observed energy levels yields crystal field parameters and unobserved levels. Structural disorder leads to broad linewidths, but cross sections are larger than in many common hosts. Tm-Tm cross relaxation rates are comparable to those in Tm:YAG, and Yb-Er transfer rates are comparable to those in Yb, Er:phosphate glass. Room temperature Yb-Er upconversion is stronger than in YAG, but modeling shows that neither unconversion nor population of Er I-4(13/2) is very efficient upon pumping Yb. The host's yellow color intensifies upon annealing in air, a potential problem for visible laser operation. Tm or Ho 2 mu m laser operation, or Er 1.5 mu m operation upon direct excitation of Er I-4(13/2), are more promising.
"Spectroscopic Evaluation Of Cayalo4 Doped With Trivalent Er, Tm, Yb And Ho For Eyesafe Laser Applications" (1994). Faculty Bibliography 1990s. 2950.