High-frequency radiation intensity noise spectrum of c.w.d.h. GaAlAs-diode lasers

Measurements of the intrinsic intensity noise spectrum of the radiation from c.w.d.h. GaAlAs-diode lasers at different pump currents are reported. The intensity noise spectrum was measured in the frequency range from 30 MHz to 8 GHz. Operating temperatures of the lasers were 10°C and ¿20°C. Stabilisation of the intensity fluctuations at currents above threshold seems to be effective at frequencies up to 8 GHz. The results are compared with computer solutions for a simple, analytical laser-noise model. A good qualitative agreement between measurements and theoretical predictions is found.