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Lateral Mode Localization in Multistripe Laser Diode

Possibility of stable phase-locked operation in a multistripe laser diode (MSLD) has been investigated through numerical analysis of lateral modes in a refractive index guided MSLD with two stripes. It has been found that even a very slight irregularity in periodic stripe structure can cause severe localization of individual lateral modes into a single stripe of the multistripe laser cavity. The localization will cause spatial hole-burning and consequent simultaneous oscillation of many lateral modes, which is equivalent to break-down of the phase-locking.