Abstract

High-frequency characterization of diode 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 measured directly. Consequently, mode beating was initially investigated in external-cavity diode lasers, with mode spacings of ~100 MHz.1 More recently, beating of adjacent longitudinal modes was observed in lasers with 2-2.5-mm long cavities.2,3 Here, we study mode beating spectra in lasers with cavity length of ~5 mm. For the first time, we have observed beating between second-neighbor modes separated by double spacing.

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