A4 Refereed article in a conference publication
High-power 1550 nm tapered DBR lasers fabricated using soft UV-nanoimprint lithography
Authors: Jukka Viheriälä, Antti T. Aho, Jaakko Mäkelä, Joel Salmi, Heikki Virtanen, Tomi Leinonen, Mihail Dumitrescu, Mircea Guina
Editors: Mark S. Zediker
Conference name: High-Power Diode Laser Technology and Applications
Publication year: 2016
Journal: Proceedings of SPIE : the International Society for Optical Engineering
Book title : High-Power Diode Laser Technology and Applications XIV
Series title: Proceedings of SPIE
Volume: 9733
First page : 97330Q
Number of pages: 7
ISBN: 978-1-62841-968-9
ISSN: 0277-786X
DOI: https://doi.org/10.1117/12.2207423
Paper reports the DBR-RWG surface grating design, the fabrication process, and the output characteristics of tapered DBR laser diodes for the applications, like for example LIDAR and range finding, that require eye-safe high-power single-mode coherent light sources. The fabricated regrowth-free DBR AlGaInAs/InP lasers exhibited a CW output power as high as 560 mW in single-mode operation at room temperature. At maximum output power the SMSR was 38 dB, proving the excellent behavior of the surface gratings. The tapered section enabled scaling the maximum CW power at room temperature from 125 mW to 560 mW, by increasing its length from 0.5 mm to 4.0 mm. The paper discusses the limitations and performance variation associated to the power scaling by using the tapered section length as a scaling parameter.
