Angled cavity photonic crystal laser diodes with tilted sidewalls for improving far-field patterns

Angled laser diodes based on the longitudinal photonic band crystal (PBC) waveguide are first proposed and fabricated at a wavelength of 905 nm. Tilted sidewalls are utilized to reflect the light downward, thus enlarging the transverse mode size. In the experiment, continuous wave (CW) output power...

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Bibliographic Details
Published in:Optics letters 2014-04, Vol.39 (8), p.2391-2394
Main Authors: Liu, L, Liu, Y, Qu, H W, Wang, Y F, Wang, H L, Feng, Z G, Zhang, Y J, Zheng, W H
Format: Article
Language:English
Subjects:
Continuous wave
Crystals
Divergence
Emission
Holes
Laser diodes
Lasers
Photonic crystals
Wavelengths
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Summary:Angled laser diodes based on the longitudinal photonic band crystal (PBC) waveguide are first proposed and fabricated at a wavelength of 905 nm. Tilted sidewalls are utilized to reflect the light downward, thus enlarging the transverse mode size. In the experiment, continuous wave (CW) output power of 630  mW/facet is achieved, and stable and narrow divergence angles are obtained in the fast and slow axes, simultaneously. The transverse angle is reduced by 44% compared with that of the conventional broad area (BA) laser based on the same wafer, and the lateral angle is only 1.65° with on-axis main-lobe emission. This device shows a promising future for laser emission with ultra-narrow divergence and easy fabrication.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.39.002391