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Proceedings Paper

Blue high power InGaN semiconductor laser diodes: design optimization of laser bars and single emitters for best performance and reliability
Author(s): Harald König; Sven Gerhard; Muhammad Ali; Urs Heine; Sönke Tautz; Christoph Eichler; Georg Brüderl; Matthias Peter; Alfred Lell; Martin Behringer; Markus Keidler; Tobias Haupeltshofer; Christoph Walter; Markus Baumann; Anne Balck; Volker Krause
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Paper Abstract

Blue high-power semiconductor lasers have increased greatly in performance over the recent decade enabling new application fields from high brightness projection up to materials processing beyond 1000W output power systems. Base for best system performance is optimal chip design and reliability of the semiconductor device. In this paper chip design optimization of blue high-power semiconductor laser bars will be shown: In contrast to IR laser bars with high lateral emitter fill factors beyond 50%, optimum design with maximum output power and efficiency for GaN laser bars is currently at very low fill factors in the range of 10%. Laser bar designs ranging from 5% fill factor up to 12.5% fill factor were fabricated and investigated. Additionally, two different emitter pitches with 200μm and 400μm were compared. The design with an emitter width of 30μm and a pitch of 400μm resulted in overall best performance. Additionally, lifetime investigations of single emitters in TO-packages will be discussed. The laser diodes were tested up to 5000h duration at different conditions in operating temperatures ranging from 64°C to 96°C and output power up to 3.5W. Dominating degradation mechanism is wear-out which is accelerated by optical output power and additional thermal activation. Extrapolation of the test results in combination with an acceleration model points towards a median lifetime of up to 65.000h for 25°C operation.

Paper Details

Date Published: 2 March 2020
PDF: 9 pages
Proc. SPIE 11262, High-Power Diode Laser Technology XVIII, 112620Q (2 March 2020); doi: 10.1117/12.2543306
Show Author Affiliations
Harald König, OSRAM Opto Semiconductors GmbH (Germany)
Sven Gerhard, OSRAM Opto Semiconductors GmbH (Germany)
Muhammad Ali, OSRAM Opto Semiconductors GmbH (Germany)
Urs Heine, OSRAM Opto Semiconductors GmbH (Germany)
Sönke Tautz, OSRAM Opto Semiconductors GmbH (Germany)
Christoph Eichler, OSRAM Opto Semiconductors GmbH (Germany)
Georg Brüderl, OSRAM Opto Semiconductors GmbH (Germany)
Matthias Peter, OSRAM Opto Semiconductors GmbH (Germany)
Alfred Lell, OSRAM Opto Semiconductors GmbH (Germany)
Martin Behringer, OSRAM Opto Semiconductors GmbH (Germany)
Markus Keidler, OSRAM Opto Semiconductors GmbH (Germany)
Tobias Haupeltshofer, OSRAM Opto Semiconductors GmbH (Germany)
Christoph Walter, OSRAM Opto Semiconductors GmbH (Germany)
Markus Baumann, Laserline Gesellschaft für Entwicklung und Vertrieb von Diodenlasern mbH (Germany)
Anne Balck, Laserline Gesellschaft für Entwicklung und Vertrieb von Diodenlasern mbH (Germany)
Volker Krause, Laserline Gesellschaft für Entwicklung und Vertrieb von Diodenlasern mbH (Germany)

Published in SPIE Proceedings Vol. 11262:
High-Power Diode Laser Technology XVIII
Mark S. Zediker, Editor(s)

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