Techniques for reducing and/or eliminating secondary modes in a dye laser oscillator

Abstract From the Canadian patent

A dye laser master oscillator is disclosed herein. This oscillator is intended to provide a single mode output that is, a primary beam of light of a specific wavelength but also has the tendency to provide secondary modes that, is, secondary beams of light at different wavelengths and slightly off-axis with respect to the primary beam as a result of grazing incident reflections within the dye cell forming part of the master oscillator. Also disclosed herein are a number of different techniques for reducing or eliminating these secondary modes.