Abstract

Recently, special attention was taken to generating coherent radiation in the visible region around 600nm. Applications in medicine, display technology and other require those wavelengths that, due to absence of powerful fundamental lasers, cannot be obtained by frequency doubling. Several alternative methods were proposed. One promising method is doubly resonant all intracavity sum frequency mixing¹ where more than 200mW of coherent radiation at 618nm were demonstrated. A numerical model for the mixer performance was proposed by Souma et al. in 1990 by solving the coupled rate equations. This model predicts the dynamical performance of the mixer, unfortunately it is quite complex. Since usually a continuous wave operation of the mixer is preferred, a simpler approach can be sufficient. Therefore, a theoretical model for continuous wave intracavity sum frequency mixing of two independent lasers inside a doubly resonant mixing resonator similar to the theory of intracavity second harmonic generation from Smith² was developed.

© 1998 IEEE