Abstract

It is known¹ that in type-I second-harmonic generation in a doubly resonant cavity where a subharmonic mode is coupled to a harmonio mode through a χ⁽²⁾ process, self-pulsing may occur for high input fundamental power. Squeezing² and QND measurements³ are possible near the self-pulsing threshold. For type-II harmonic generation, however, there are two sub-harmonic modes coupled to the harmonic mode through the same χ⁽²⁾ process but with different arrangements of polarizations. The extra subharmonic mode will make the dynamics of the system totally different.

© 1994 Optical Society of America