Abstract
Cascadable active laser logic devices are demonstrated, the surface-emitting laser logic (SELL) device consists of an AlGaAs superlattice surface-emitting laser parallelly connected to a GaAs/AlGaAs heterojunction phototransistor (HPT). The basic operations of the SELL device ate nor and inverter functions. The SELL device is normally on (emitting laser light) without any light incident on the HPT part of it. But the SELL device can be turned off by shining light above certain threshold intensity. In other words, when the SELL is on, if is in a lasing mode generating large optical output. And when it is off, it is in a light-emitting diode mode with small optical output. The output intensity ratio between lasing and nonlasing modes insures enough contrast ratio between on and off states for system uses such as photonic switching, optical computing, and neural networks. This nor function was unavailable in the earlier laser logic devices.1 Moreover, the speed of the device can be fast, since the turn-on speed is determined by the switch-on time of the surface-emitting laser and the turn-off speed is determined by the torn-on speed of the HPT of the SELL device.
© 1992 Optical Society of America
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