All-optical Modulation via Nonlinear Cascading in Type II Second Harmonic Generation

G. Assanto, Z. Wang, D. J. Hagan, and E. W. VanStryland

Appl. Phys. Lett. 67, 2120-2122 (1995)


Utilizing a Type II interaction for second-harmonic generation in a crystal of potassium titanyl phosphate, we experimentally demonstrate the all-optical action of a light modulator with both signal and output at the same optical wavelength. This modulator is controlled by the intensity of the injected signal, a characteristic that makes it a suitable candidate for all-optical transistor action and ultra fast analog processing in transparent networks for communications.