Mode-transition characteristics and tunability of an AlGaAs laser

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Abstract
The wavelength characteristics of a transverse-junction-stripe AlGaAs laser were precisely measured for a wide range of diode temperatures and injection currents. A very simple rule was found in the mode transition characteristics. Typical features of mode competition, such as mode-competition noise, mode hopping with and without hysteresis phenomenon, and a tristable state of the lasing wavelength, were successively observed for a single diode sample. The characteristics were analyzed theoretically by using a two-mode intensity equation of laser oscillation under the assumption of a homogeneously broadened gain spectrum. The results were in good agreement with the experiment.