We describe several experiments which use a picosecond pump-and-probe technique to perform optical logic operations in GaAs etalons [1, 2]. An operating cycle time of less than 70 ps is demonstrated in a thin “windowless” bulk GaAs device by successive operations. Arrays of NOR gates up to 2 × 4 in size are obtained by optically contacting a multiple-quantum-well (MQW) structure between reasonably flat mirrors. We also demonstrate an “optical data diode” through which data can flow efficiently in only one direction.

John F. Duffy et al., Pulsed Optical Logic in GaAs Etalons, 8 Optical Bistability III - Springer Proceedings in Physics 32–34 (1985).