Beyond blue pico laser: development of high power blue and low power direct green

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

doi:10.1117/12.917469

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8 February 2012 Beyond blue pico laser: development of high power blue and low power direct green

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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Proceedings Volume 8277, Novel In-Plane Semiconductor Lasers XI; 82770K (2012) https://doi.org/10.1117/12.917469
Event: SPIE OPTO, 2012, San Francisco, California, United States

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.

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Clemens Vierheilig, Christoph Eichler, Sönke Tautz, Alfred Lell, Jens Müller, Fabian Kopp, Bernhard Stojetz, Thomas Hager, Georg Brüderl, Adrian Avramescu, Teresa Lermer, Jelena Ristic, and Uwe Strauss "Beyond blue pico laser: development of high power blue and low power direct green", Proc. SPIE 8277, Novel In-Plane Semiconductor Lasers XI, 82770K (8 February 2012); https://doi.org/10.1117/12.917469

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