Resonant optical transmission and coupling in phase‐locked diode laser arrays of antiguides: The resonant optical waveguide array

Uniform linear arrays of antiguides have 100% optical transmission between elements when the interelement spacing is an integer number of leaky wave half‐wavelengths in the lateral direction. Resonant in‐phase‐mode and out‐of‐phase‐mode coupling occurs when the number of half‐wavelengths is odd and even, respectively. Such devices are called resonant optical waveguide (ROW) arrays. The discrimination between the resonant array mode and adjacent array modes reaches a maximum in close proximity to the resonance. An AlGaAs/GaAs ROW diode laser array operating close to resonance is demonstrated. Devices with virtually uniform near‐field intensity profiles operate in stable, diffraction‐limited in‐phase modes to drive levels in excess of three times threshold.

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