Integrated optical waveguide examination using anti-Stokes fluorescence

Abstract

The local fields propagating in integrated optical waveguides have been examined by coating the guide with a material containing Rhodamine B. The Rhodamine absorbs a portion of 6328‐Å light propagating in the guide and emits light centered at 5950 Å via an anti‐Stokes emission process. The intensity of the anti‐Stokes emission at a given point is proportional to the local 6328‐Å intensity. Since the anti‐Stokes light is not guided, it is easily observable and has permitted the visualization of a light‐guided phenomenon which was previously unobservable in integrated optical microstructures.