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Spectroscopic analysis and the effects of color centers on the laser performance of Nd: CaZn2Y2Ge3O12 |
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| Authors: | Dhiraj K Sardar Santiago Vizcarra Mohammad A Islam Toomas H Allik Edward J Sharp Albert A Pinto |
| Affiliation: | a Division of Earth and Physical Sciences, The University of Texas at San Antonio, San Antonio, TX 78249, USA b Science Applications International Corporation, 1710 Goodridge Drive, McLean, VA 22102, USA c Army Research Laboratory, Fort Belvoir, VA 22060, USA |
| Abstract: | Spectroscopic and EPR investigations of Nd3+-doped CaZn2Y2Ge3O12 (CAZGAR) have been performed. The absorption, fluorescence, excitation spectra and fluorescence lifetime have been measured at room temperature. The Judd-Ofelt theory has been applied to the measured optical absorption intensities to predict the radiative decay rates, branching ratios, and peak stimulated emission cross section from the metastable 4F3/2 state to the 4I9/2 manifold. The fluorescence lifetime of the 4F3/2 level of Nd3+ at low concentration in this host was measured to be 285 ± 10 μs, which is longer than that for Nd3+: YAG. Color centers located at zinc octahedral sites have been produced in these crystals by ultraviolet irradiation and have been detected by EPR techniques. The effects of the color centers on the potential laser characteristics of this materials are discussed. |
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