High-power, in-phase-mode operation from resonant phase-locked arrays of antiguided diode lasers

Mawst, L. J.; Botez, D.; Roth, T. J.; Peterson, G.
July 1989
Applied Physics Letters;7/3/1989, Vol. 55 Issue 1, p10
Academic Journal
A resonant phase-locked array of antiguides is demonstrated for the first time. A 10/11 element AlGaAs/GaAs antiguided array is grown by two-step metalorganic chemical vapor deposition. Longitudinally, the structure consists of two noncollinear sets of antiguides separated by a half-Talbot distance, an ensemble that acts as a spatial filter. Out-of-phase-mode operation is suppressed both by this diffractive-type spatial filter and by large interelement loss. Resonant in-phase-mode operation is a result of the interelement spacing corresponding to one leaky-wave half wavelength in the lateral direction. Near the in-phase-mode resonance, array modes adjacent to the in-phase-mode are discriminated against because they have large radiation losses in the antiguided structure and significant edge diffraction losses in the spatial filter. Stable, diffraction-limited in-phase-mode beam patterns are achieved to 10 times threshold and 450 mW output power.


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