Accession Number : AD0427079


Title :   ELECTRONIC ENERGY LEVELS OF ER3+(4F11) IN LAF3,


Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF


Personal Author(s) : Krupke,W F


Report Date : 08 Nov 1963


Pagination or Media Count : 33


Abstract : The analysis of the electronic states (optical spectrum) of trivalent erbium in single crystals of LaF3 was extended, based on new absorption measurements of 5000 recinrocal cm in the infrared and to 50,000 reciprocal cm in the ultraviolet and on fluorescence measurements from 3000 to 25,000 Angstroms. The crystalfield Stark components and energy centers of gravity of some 21 J-levels are now established. The parameters giving the best over-all agreement between the predicted free-ion spectrum and 21 of the observed energy centers of gravity are F2 = 435.74, F4 = 67.208, F6 = 7.388, and zeta = -2350.82 reciprocal cm. An intense ultraviolet absorption between 3500 and 1850 Angstroms, observed in even pure crystals of LaF3, is discussed interms of impurities and lattice defects. Coherent emission at 1.6 microns was observed at 77K; experiments to observe green coherent emission are also briefly discussed. (Author)


Descriptors :   *LASERS , ERBIUM , LANTHANUM COMPOUNDS , TAYLORS SERIES , CRYSTAL DEFECTS , EMISSIVITY


Distribution Statement : APPROVED FOR PUBLIC RELEASE