Mechanism of a population inversion between the /sup 4/I/sub 11/2/ and /sup 4/I/sub 13/2/ levels of the Er/sup 3 +/ ion in Y/sub 3/Al/sub 5/O/sub 12/ crystals
Journal Article
·
· Sov. J. Quant. Electron. (Engl. Transl.); (United States)
Studies of the spectra of stimulated emission from Y/sub 3/Al/sub 5/O/sub 12/:Er/sup 3 +/ crystals (/sup 4/I/sub 11/2/--/sup 4/I/sub 13/2/), containing 20 wt.% activator ions, showed that, as the temperature decreased from 300 to 77 /sup 0/K, a change was observed in the emission wavelength (at T=300 /sup 0/K it was found that lambda/sub 1/=2.9364 ..mu..lambda/sub 2/=2.8310 ..mu.. and at T=77 /sup 0/K it was found that lambda/sub 1/=2.6930 ..mu.., lambda/sub 2/=2.8970 ..mu..). This could not be attributed to a thermal redistribution of the populations of the Stark components of the /sup 4/I/sub 11/2/ and /sup 4/I/sub 13/2/ upper and lower active levels. An analysis of the results showed that the temperature shift of the stimulated emission spectrum was due to changes in the processes of relaxation of excitation from the upper levels of the Er/sup 3 +/ ion which caused substantial changes in the populations of the /sup 4/I/sub 11/2/ and /sup 4/I/sub 13/2/ multiplets.
- Research Organization:
- P. N. Lebedev Physics Institute, Academy of Sciences of the USSR, Moscow
- OSTI ID:
- 5199055
- Journal Information:
- Sov. J. Quant. Electron. (Engl. Transl.); (United States), Journal Name: Sov. J. Quant. Electron. (Engl. Transl.); (United States) Vol. 10:4; ISSN SJQEA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ATOMIC IONS
CHALCOGENIDES
CHARGED PARTICLES
EMISSION
ENERGY-LEVEL TRANSITIONS
ERBIUM IONS
FERRITE GARNETS
IONS
LASERS
MINERALS
OXIDES
OXYGEN COMPOUNDS
POPULATION INVERSION
SOLID STATE LASERS
STIMULATED EMISSION
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
420300* -- Engineering-- Lasers-- (-1989)
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ATOMIC IONS
CHALCOGENIDES
CHARGED PARTICLES
EMISSION
ENERGY-LEVEL TRANSITIONS
ERBIUM IONS
FERRITE GARNETS
IONS
LASERS
MINERALS
OXIDES
OXYGEN COMPOUNDS
POPULATION INVERSION
SOLID STATE LASERS
STIMULATED EMISSION
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS