Internal and external field fluctuations of a laser oscillator: Part II--Electrical circuit theory

TLDR: In this article, the amplitude and phase noise spectra of the internal and external fields of a negative resistance oscillator were derived using electrical circuit theory, and it was shown that the difference between external and internal fluctuations becomes important in the quantum domain where external noise sources are not negligible as they often are in the classical domain.

Abstract: The amplitude and phase noise spectra of the internal and external fields of a negative resistance oscillator are derived using electrical circuit theory. It is shown that the difference between internal and external fluctuations becomes important in the quantum domain ( h\omega > kT ) where external noise sources are not negligible as they often are in the classical domain ( h\omega ). Using established methods to describe quantum fluctuations in electrical circuits, we obtain results in full agreement with the more exact but less general direct quantum mechanical analysis of a Fabry-Perot laser in Part I.