Abstract

In an absorptive nonlinear optical medium the instantaneous nonlinear optical response is often accompanied by a slow thermal contribution driven by the absorption of the laser energy by the medium.¹ We have studied the thermally induced damped oscillatory time response of an amorphous layer of polymeric distributed piperidinovinyl polyquinoxaline (~1 µm thick).² We used a standard degenerate four-wave mixing scheme with a laser pulse of FWHM = 23 ± 2 ps at 532 nm.

© 1989 Optical Society of America