Abstract

Using the variable stripe length method we demonstrated positive net optical gain around 500nm for an optically pumped laser with InGaNGaN 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 502nm by using a 3-mm-long cavity with cleaved facets.

© 2009 Optical Society of America

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