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Proceedings Paper

Beyond blue pico laser: development of high power blue and low power direct green
Author(s): Clemens Vierheilig; Christoph Eichler; Sönke Tautz; Alfred Lell; Jens Müller; Fabian Kopp; Bernhard Stojetz; Thomas Hager; Georg Brüderl; Adrian Avramescu; Teresa Lermer; Jelena Ristic; Uwe Strauss
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Paper Abstract

There is a big need on R&D concerning visible lasers for projection applications. The pico-size mobile projection on the one hand awaits the direct green lasers with sufficiently long lifetimes at optical powers above 50mW. In this paper we demonstrate R&D-samples emitting at 519nm with lifetimes up to 10.000 hours. The business projection on the other hand requires high power operation and already uses blue lasers and phosphor conversion, but there is a strong demand for higher power levels. We investigate the power limits of R&D laser structures. In continuous wave operation, the power is limited by thermal roll-over. With an excellent power conversion efficiency of up to 29% the thermal roll-over is as high as 2.5W for a single emitter in TO56 can. We do not observe significant leakage at high currents. Driven in short pulse operation to prevent the laser from self heating, linear laser characteristics of optical power versus electrical current are observed up to almost 8W of optical power.

Paper Details

Date Published: 9 February 2012
PDF: 7 pages
Proc. SPIE 8277, Novel In-Plane Semiconductor Lasers XI, 82770K (9 February 2012); doi: 10.1117/12.917469
Show Author Affiliations
Clemens Vierheilig, OSRAM Opto Semiconductors GmbH (Germany)
Christoph Eichler, OSRAM Opto Semiconductors GmbH (Germany)
Sönke Tautz, OSRAM Opto Semiconductors GmbH (Germany)
Alfred Lell, OSRAM Opto Semiconductors GmbH (Germany)
Jens Müller, OSRAM Opto Semiconductors GmbH (Germany)
Fabian Kopp, OSRAM Opto Semiconductors GmbH (Germany)
Bernhard Stojetz, OSRAM Opto Semiconductors GmbH (Germany)
Thomas Hager, OSRAM Opto Semiconductors GmbH (Germany)
Georg Brüderl, OSRAM Opto Semiconductors GmbH (Germany)
Adrian Avramescu, OSRAM Opto Semiconductors GmbH (Germany)
Teresa Lermer, OSRAM Opto Semiconductors GmbH (Germany)
Jelena Ristic, OSRAM Opto Semiconductors GmbH (Germany)
Uwe Strauss, OSRAM Opto Semiconductors GmbH (Germany)


Published in SPIE Proceedings Vol. 8277:
Novel In-Plane Semiconductor Lasers XI
Alexey A. Belyanin; Peter M. Smowton, Editor(s)

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