Media type: Text; E-Article Title: Temperature issues with white laser diodes, calculation and approach for new packages Contributor: Lachmayer, Roland [Author]; Kloppenburg, Gerolf [Author]; Stephan, Serge [Author]; Tománek, Pavel [Author]; Senderáková, Dagmar [Author]; Páta, Petr [Author] imprint: Bellingham, Wash. : SPIE, 2015 Published in: Photonics, Devices and Systems VI : 27-29 August 2014, Prague, Czech Republic ; Proceedings of SPIE 9450 (2015) Issue: published Version Language: English DOI: https://doi.org/10.15488/1784; https://doi.org/10.1117/12.2070411 ISBN: 978-1-62841-566-7 ISSN: 0277-786X Keywords: Automotive applications ; Laser ; Environment conditions ; Lasers ; Semiconductor lasers ; Laser activated remote phosphor ; Adaptive optics ; Lighting ; Thermal management of laser diodes ; Heat flux ; Headlights ; Lifetime models ; Automotive lighting ; Luminance ; Light emitting diodes ; Junction temperatures ; Laboratory conditions ; Lifetime modeling ; Light sources ; Konferenzschrift ; Lighting fixtures ; Remote phosphors ; Diodes ; Environment temperature Origination: Footnote: Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen. Description: Bright white light sources are of significant importance for automotive front lighting systems. Today's upper class systems mainly use HID or LED light sources. As a further step laser diode based systems offer a high luminance, efficiency and allow the realization of new dynamic and adaptive light functions and styling concepts. The use of white laser diode systems in automotive applications is still limited to laboratories and prototypes even though announcements of laser based front lighting systems have been made. But the environment conditions for vehicles and other industry sectors differ from laboratory conditions. There for a model of the system's thermal behavior is set up. The power loss of a laser diode is transported as thermal flux from the junction layer to the diode's case and on to the environment. There for its optical power is limited by the maximum junction temperature (for blue diodes typically 125 - 150°C), the environment temperature and the diode's packaging with its thermal resistances. In a car's headlamp the environment temperature can reach up to 80°C. While the difference between allowed case temperature and environment temperature is getting small or negative the relevant heat flux also becomes small or negative. In early stages of LED development similar challenges had to be solved. Adapting LED packages to the conditions in a vehicle environment lead to today's efficient and bright headlights. In this paper the need to transfer these results to laser diodes is shown by calculating the diodes lifetimes based on the presented model. © 2015 SPIE. Access State: Open Access