Abstract
An Optical inverter was demonstrated througha purely optical approach in a simple structure of combining a laser diode with an Er: YAG crystal. The intensity of an output laser transmitted through the Er: YAG can be suddenly decreased by increasing an injection current to the laser diode to put the oscillation wavelength of the laser close to the central absorption peak of the Er: YAG at 787.6 nm. With the use of this effect, the optical signal inversion was realized at a response time of several nanoseconds because it responds to the laser diode output with a rise time of 7nsec.
