0° phase mode operation in phased-array laser diode with symmetrically branching waveguide

Taneya, M.; Matsumoto, M.; Matsui, S.; Yano, S.; Hijikata, T.
August 1985
Applied Physics Letters;8/15/1985, Vol. 47 Issue 4, p341
Academic Journal
An AlGaAs phased-array laser with a novel index waveguide structure like the letter "Y" is described. In all arrays with such a structure, controllable selection of only 0° phase mode and complete suppression of 180° phase shift mode is achieved up to ∼65 mW in 2%-96% coated devices. The far-field patterns, near-field patterns, and spectra of the array are in good agreement with the theoretical results. The cw threshold currents are ∼100 mA, and the external differential quantum efficiencies are 57% per facet.


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