Improvement of the spectral purity of tunable lasers using a self-selection interferometer cavity: Comparison with a conventional cavity

A novel approach for narrow-line selection and wideband tuning of lasers using a self-selection interferometer is applied to obtain a high spectral purity emission. A comparison on the base of the background emission level is made between a proposed and a conventional cavity scheme with same selector. The results of theoretical investigation and experiments show a decreasing of the background emission in more than two orders of magnitude for the new realized scheme. Such kind of lasers (dye, Ti3+Al2O3) are of special interest for application in Rhaman spectroscopy and isotope separation systems.