Journal
LASER PHYSICS LETTERS
Volume 7, Issue 3, Pages 213-217Publisher
IOP PUBLISHING LTD
DOI: 10.1002/lapl.200910130
Keywords
divergence angle; graded index profile; low index step; single mode; vertical-cavity surface-emitting laser
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Funding
- Chinese National Key Basic Research Special Fund/CNKBRSF [2006CB921705]
- National Natural Science Foundation of China [10634080, 60677046, 60838003]
- National High Technology Research and Development Program of China [2007AA03Z410, 2007AA03Z408]
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We demonstrated oxide-confined 850-nm vertical-cavity surface-emitting lasers (VCSELs) with a two-dimensional petal-shaped holey structure composed of several annular-sector-shaped holes. Four types of devices with different hole numbers were designed and fabricated. The measured results showed that the larger hole number was beneficial to purifying the lasing mode, and realizing the single-mode operation. The side mode suppression ratio (SMSR) exceeded 30 dB throughout the entire drive current. Mode selective loss mechanism was used to explain the single-mode characteristic. The single-mode devices possessed good beam profiles, and the lowest divergence angle was as narrow as 3.2 degrees (full width at half maximum), attributed to the graded index profile and the shallow etching in the top distributed Bragg reflector (DBR). [GRAPHICS] Scanning electron microscope (SEM) image of the fabricated device (C) 2010 by Astro Ltd. Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA
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