Abstract
Graded index separate confinement heterostructure single quantum well (GRINSCH-SQW ) lasers have been shown to offer a number of significant advantages over conventional double heterostructure lasers for high power applications.1,2 The low loss of the passive waveguide regions leads to very high external differential quantum efficiencies (ηd). This coupled with the high modal gain inherent in these structures results in low threshold current densities (Jth). Moreover, the characteristic temperature (To) of threshold current (Ith) tends to increase with cavity length while the threshold current itself increases only slowly, making junction-side up operation to high CW powers possible under a wide range of conditions.3,4 This paper explores the benefits of six GRINSCH-SQW variations and reports the optimized structure from this survey as measured from over 400 devices tested in recent months.
© 1987 Optical Society of America
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