Investigation of low-frequency power fluctuations of AIGaAs injection lasers

An experimental investigation was made of power fluctuations of radiation from AIGaAs injection lasers in the 0.4–200 kHz frequency range. It was found that low-frequency fluctuations of the radiation power are due to flicker noise of the pump current through the diode. A sharp increase in the power fluctuations was observed in the presence of spontaneous high-frequency pulsations of the laser radiation.