Excess quantum noise due to mode nonorthogonality in dielectric microresonators
arXiv:0809.2349 · doi:10.1103/PhysRevA.79.061801
Abstract
This work presents a theory of the frequency-resolved light emission of active two-dimensional dielectric microresonators, which are characterized by a highly non-paraxial mode structure and frequently feature a position-dependent dielectric constant and non-uniform gain. The Lorentzian intensity profile is characterized by an appropriately generalized Petermann factor, a renormalized peak position, and the cold-cavity resonance lifetime Gamma. The theory also delivers a relation of Gamma to the laser threshold that improves earlier phenomenological expressions even for the case of a homogeneous medium.
4 + 2 pages, 1 + 1 figures (text plus supplemental information)