THEORY OF INDUCED AND SPONTANEOUS EMISSION.

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Abstract:

The problem of induced and spontaneous emission is investigated for an atomic two-level system and incident beams of radiation which are either in a coherent state or in a stationary state contain a definite number of photons. The frequency spectrum of the incident beam is assumed to be narrow compared to the natural linewidth of the system. The spontaneous emission for frequencies within the narrow band of the incident radiation is sharply reduced compared to the prediction of the natural line-shape. A hole is burned in the natural line-shape within the narrow frequency band, thus effectively quenching the spontaneous emission at some frequency within the band. This effect is shown to occur both for the coherent and stationary beams. Also quantities proportional to the induced and spontaneous probability amplitudes and the lifetimes are computed for times comparable to and long compared to the free lifetime of the state. Author

Author(s):
Bergmann, Saul M.
Author Organization(s):
AMERICAN OPTICAL CORP SOUTHBRIDGE MASS RESEARCH GROUP
Descriptive Note:
Final rept. for May 64-Jun 65,
Annotation:
Theory of induced and spontaneous emission in lasers.
Pagination:
0096

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AFCRL-65-505
Contract/Grant Number(s):
AF19 628 4156
Task Number(s):
464502
Project Number(s):
4645
Monitor Series:
65-505
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
(*LASERS, EMISSIVITY), (*EMISSIVITY, THEORY), ATOMIC ENERGY LEVELS, PHOTONS, FREQUENCY, LINE SPECTRA, QUENCHING(INHIBITION), QUANTUM THEORY, FIELD THEORY
Report Date:
1965 Jul 01