COMPARISON OF LASER-DIODE RESPONSE TO PULSED ELECTRICAL AND RADIATIVEEXCITATIONS

We have studied the electrical and optical response of two laser diode s under transient irradiation. Both diodes exhibit a positive photocur rent, which adds to the bias current, and a decrease of the optical po wer until extinction when dose rate is increased. Direct carrier gener ation in the laser cavity is a second order phenomena. The diode overa ll response is driven by both the substrate photocurrent and the trans ient conduction of current confinement regions, which decrease the net current density in the cavity and switches-off the laser emission. Th is behaviour is in good agreement with pulsed electrical characterizat ions and 2D simulations.