19 February 2009 Optical characterization and crystal field calculations for some erbium based solid state materials for laser refrigeration
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Abstract
The potential of three erbium based solids hosts has been investigated for laser cooling. Absorption and emission spectra have been studied for the low lying IR transitions of erbium that are relevant to recent reports of cooling using the 4I15/2-4I9/2 and4I15/2 -4I13/2 transitions. Experimental studies have been performed for erbium in three hosts; ZBLAN glass and KPb2Cl5 and Cs2NaYCl6 crystals. In order to estimate the efficiencies of cooling, theoretical calculations have been performed for the cubic Elpasolite (Cs2NaYCl6 ) crystal. These calculations also provide a first principle insight into the cooling efficiency for non-cubic and glassy hosts where such calculations are not possible.
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Z. Hasan, Z. Hasan, Z. Qiu, Z. Qiu, Jackie Johnson, Jackie Johnson, Uwe Homerick, Uwe Homerick, } "Optical characterization and crystal field calculations for some erbium based solid state materials for laser refrigeration", Proc. SPIE 7228, Laser Refrigeration of Solids II, 72280H (19 February 2009); doi: 10.1117/12.815248; https://doi.org/10.1117/12.815248
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