Recent progress for blue VCSELs and challenges to move to UV
Other conference contribution, 2020

We will summarize state-of-the-art results in III-nitride-based vertical-cavity surface-emitting lasers (VCSELs) and the main challenges in going from blue to ultraviolet-emitting devices. In particular we will highlight how to reduce threshold current densities by using optically guided cavities and our method to simultaneously achieve high-reflectivity mirrors and good control over the cavity length for AlGaN-based ultraviolet VCSELs. The latter has resulted in the shortest emission wavelength from a VCSEL at around 310 nm. This claim of lasing is supported by a nonlinear increase in output power versus pump power and a simultaneous beam width and spectral narrowing around threshold.

Author

Åsa Haglund

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Filip Hjort

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Johannes Enslin

Technische Universität Berlin

Munise Cobet

Technische Universität Berlin

Michael Alexander Bergmann

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Seyed Ehsan Hashemi

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Tim Kolbe

Ferdinand-Braun-Institut fur Hochstfrequenztechnik

Johan Gustavsson

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Jörgen Bengtsson

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Tim Wernicke

Technische Universität Berlin

Michael Kneissl

Technische Universität Berlin

SPIE Photonics West, OE107: Gallium nitride materials and devices XV
San Franscisco, USA,

Subject Categories

Accelerator Physics and Instrumentation

Atom and Molecular Physics and Optics

Other Physics Topics

Areas of Advance

Information and Communication Technology

Nanoscience and Nanotechnology (SO 2010-2017, EI 2018-)

Infrastructure

Chalmers Materials Analysis Laboratory

Nanofabrication Laboratory

More information

Latest update

11/8/2021