Accession Number : AD0622100

Title :   THEORY OF INDUCED AND SPONTANEOUS EMISSION.

Descriptive Note : Final rept. for May 64-Jun 65,

Corporate Author : AMERICAN OPTICAL CORP SOUTHBRIDGE MASS RESEARCH GROUP

Personal Author(s) : Bergmann,Saul M.

Report Date : JUL 1965

Pagination or Media Count : 96

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)

Descriptors :   (*LASERS, EMISSIVITY), (*EMISSIVITY, THEORY), ATOMIC ENERGY LEVELS, PHOTONS, FREQUENCY, LINE SPECTRA, QUENCHING(INHIBITION), QUANTUM THEORY, FIELD THEORY

Distribution Statement : APPROVED FOR PUBLIC RELEASE