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28 April 2016 Progress and challenges in electrically pumped GaN-based VCSELs
Å. Haglund, E. Hashemi, J. Bengtsson, J. Gustavsson, M. Stattin, M. Calciati, M. Goano
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Proceedings Volume 9892, Semiconductor Lasers and Laser Dynamics VII; 98920Y (2016) https://doi.org/10.1117/12.2229428
Event: SPIE Photonics Europe, 2016, Brussels, Belgium
Abstract
ABSTRACT The Vertical-Cavity Surface-Emitting Laser (VCSEL) is an established optical source in short-distance optical communication links, computer mice and tailored infrared power heating systems. Its low power consumption, easy integration into two-dimensional arrays, and low-cost manufacturing also make this type of semiconductor laser suitable for application in areas such as high-resolution printing, medical applications, and general lighting. However, these applications require emission wavelengths in the blue-UV instead of the established infrared regime, which can be achieved by using GaN-based instead of GaAs-based materials. The development of GaN-based VCSELs is challenging, but during recent years several groups have managed to demonstrate electrically pumped GaN-based VCSELs with close to 1 mW of optical output power and threshold current densities between 3-16 kA/cm2. The performance is limited by challenges such as achieving high-reflectivity mirrors, vertical and lateral carrier confinement, efficient lateral current spreading, accurate cavity length control and lateral optical mode confinement. This paper summarizes different strategies to solve these issues in electrically pumped GaN-VCSELs together with state-of-the-art results. We will highlight our work on combined transverse current and optical mode confinement, where we show that many structures used for current confinement result in unintentionally optically anti-guided resonators. Such resonators can have a very high optical loss, which easily doubles the threshold gain for lasing. We will also present an alternative to the use of distributed Bragg reflectors as high-reflectivity mirrors, namely TiO2/air high contrast gratings (HCGs). Fabricated HCGs of this type show a high reflectivity (>95%) over a 25 nm wavelength span.
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Å. Haglund, E. Hashemi, J. Bengtsson, J. Gustavsson, M. Stattin, M. Calciati, and M. Goano "Progress and challenges in electrically pumped GaN-based VCSELs", Proc. SPIE 9892, Semiconductor Lasers and Laser Dynamics VII, 98920Y (28 April 2016); https://doi.org/10.1117/12.2229428
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Cited by 7 scholarly publications and 2 patents.
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KEYWORDS
Vertical cavity surface emitting lasers
Vertical cavity surface emitting lasers
Reflectivity
Quantum wells
Dielectrics
Gallium nitride
Gallium nitride
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