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A phase-locked array of InGaAsP lasers has been fabricated for the first time. This 50-μm-wide array utilized diffraction coupling between adjacent lasers to achieve phase locking. Threshold current as low as 200 mA is obtained for arrays with 250-μm cavity length. Smooth single-lobe far-field patterns with beam divergence as narrow as 3° have been achieved.
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Chen et al. (1983) studied this question.
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