Related Experiment Video
Updated: Jun 16, 2026

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
Effects of medium and gain inhomogeneities in unstable optical resonators
Abstract:
A previously formulated waveguide analysis of empty unstable optical resonators with finite mirrors is generalized to accommodate active media with transverse variations of refractive index and gain. The theory is developed for parallel plane mirrors and arbitrary medium inhomogeneities and is then applied to special profiles for which explicit analytical solutions can be obtained. Emphasis is placed on modifications, due to the active medium, of the edge-diffraction-dominated resonant mode behavior. It is found that even slight variations in refractive index can exert a marked influence on the resonant mode characteristics. These conclusions remain applicable also for curved mirror geometries.
Related Concept Videos
Concept of Resonance and its Characteristics
Oscillations In An LC Circuit
Sound Waves: Resonance
Parallel Resonance
Effects of feedback
Feedback significantly modifies the gain of a control system. The gain of a system without feedback is altered by a factor of one plus GH, where G represents...
Characteristics of Series Resonant Circuit

