Web1 sep. 2024 · Experimental evidence of the validity of the McCumber theory relating emission and absorption for rare-earth glasses R. Martin, R. S. Quimby Physics 2006 The validity of the theory of McCumber [Phys. Rev.136, A954-A957 (1964)] has been tested by applying it to a number of ground-state transition in various rare-earth-doped glasses. Web20 mei 1997 · The Er(3+) absorption cross section is determined as a function of wavelength. We used the McCumber theory to derive the emission cross section spectrum from the absorption results, which we then compared with the Er(3+) photoluminescence spectrum. The peak absorption and emission cross sections are found to be 6 x 10( …
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Web27 jun. 2024 · The McCumber hypothesis is that the distribution of excitation among sublevels is thermal. The effective temperature determines the spectra of emission and … WebAn approximate treatment that eliminates the McCumber theory's requirement of detailed electronic structure has been developed and found to usually provide more accurate values than an Einstein analysis. We have applied the theory of McCumber to the (4)4I(13/2) ? (4)I(15/2) transition of Er(3+) -doped glasses and confirmed its ability to provide both … orange colors list
Range of validity of McCumber theory in relating absorption and ...
Web28 apr. 2006 · The theory was tested by comparing the cross sections calculated using the McCumber relation with those obtained from measurements. At room temperature, a … WebAccording to the McCumber hypothesis, the cross-sectionsσaandσedo not depend on the populationsN1andN2. Therefore, we can deduce the relation, assuming the thermal … Web1 jan. 2006 · The power of the McCumber theory [D. E. McCumber, Phys. Rev. 136 , A954-957 (1964)] consists in its ability to accurately predict emission cross section … orange colour objects for kids