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Spectroscopic evaluation of CaYA1O4 doped with trivalent Er, Tm, Yb and Ho for eyesafe laser applications |
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| Authors: | J. Andrew Hutchinson Horacio R. Verdun Bruce H. T. Chai Bahram Zandi Larry D. Merkle |
| Affiliation: | a Lasers and Photonics Division, Night Vision and Electronic Sensors Directorate, Fort Belvoir, VA 22060-5677, USA b Fibertek, Inc., 5120 Herndon Parkway, Herndon, VA 22070, USA c Departments of Physics and Mechanical Engineering, Center for Research in Electro-Optics and Lasers, University of Central Florida, Orlando, FL 32826, USA d Nonlinear Optical Devices Branch, Army Research Laboratory, Fort Belvoir, VA 22060-5838, USA |
| Abstract: | Spectroscopic properties of relevance for laser applications have been studied for rare earths in CaYA1O4. 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 Er4I13/2 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 μm laser operation, or Er 1.5 μ operation upon direct excitation of Er4I13/2, are more promising. |
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