Abstract

Transverse-mode stabilized visible diode lasers in the 0.7-μm wavelength region are fabricated by growing a Ga1−xAlxAs double heterostructure on a grooved GaAs substrate (channeled-substrate-planar structure). The diodes operate stably in the fundamental transverse mode and provide nonstigmatic laser beams. They can be collimated with a 0.5–1-mrad beam divergence using a simple graded-index fiber lens. Corresponding to single-longitudinal-mode operation at current levels above 1.1 times the threshold, a coherence length as long as 14 m is obtained in Michelson interference experiments.

© 1979 Optical Society of America

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