1. Current-injection spiral-shaped microcavity disk laser diodes with unidirectional emission
- Author
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Michael Kneissl, Naoko Miyashita, Grace D. Chern, Richard K. Chang, Mark Teepe, and N. M. Johnson
- Subjects
Materials science ,Physics and Astronomy (miscellaneous) ,Laser diode ,business.industry ,Physics::Optics ,Laser ,Optical microcavity ,law.invention ,Optics ,Quantum dot laser ,law ,Optoelectronics ,Disk laser ,Laser power scaling ,business ,Current density ,Astrophysics::Galaxy Astrophysics ,Diode - Abstract
A spiral-shaped microcavity heterojunction laser diode fabricated with InGaN multiple quantum wells is demonstrated to operate under current injection conditions and emit unidirectionally. Room-temperature laser operation was achieved for microcavity disk radii ranging from 50 to 350 μm and threshold current densities as low as 4.6 kA/cm2. Unidirectional laser emission is clearly revealed in the far-field pattern with the lateral divergence angle ranging from 60° to 75°. Output power of more than 25 mW was obtained for emission wavelengths near 400 nm. more...
- Published
- 2004
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