Abstract

ABSTRACT High-frequency spectra of free-running 5-mm-long triple-quantum-well graded-index separate-confinement heterostructure broad-area diode lasers emitting at ~1 µm are investigated in the range of 1-20 GHz using RF spectrum analyzer. The spectra reveal stable beat lines at ~8 and ~16 GHz, corresponding to single and double mode spacings between adjacent longitudinal modes. A current-dependent peak, varying from 0.6 to 2 GHz, is associated with the relaxation resonance. Measurements of mode beating spectra provide additional characterization of diode laser emission for coherent light applications. Key words: Semiconductor lasers, quantum wells, mode beating 1. INTRODUCTION High-frequency characterization of semiconductor lasers is an important topic in studies of high-speed modulation, mode locking, Q-switching, mode selection and tuning, etc . Beating between longitudinal modes in typical diode lasers occurs at frequencies too high to be measur ed directly, in the THz frequency range

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