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Lasing and optical gain around 500   nm from optically pumped lasers grown on c-plane GaN substrates

Dmitry S. Sizov, Rajaram Bhat, Jerome Napierala, Jingqun Xi, Donald E. Allen, Chad S. Gallinat, and Chung-En Zah

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Abstract

Using the variable stripe length method we demonstrated positive net optical gain around 500 nm for an optically pumped laser with InGaN∕GaN multiple quantum wells grown on c-plane freestanding GaN substrates. We found that owing to low optical gain, reducing optical losses is crucial to increasing lasing wavelength. We demonstrated lasing at 502 nm by using a 3-mm-long cavity with cleaved facets.

© 2009 Optical Society of America

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