A method to determine the temperature of an operating laser diode is to measure the wavelength emitted by the array and use the linear relationship between wavelength and temperature to infer the temperature of the laser diode bar. A unique experimental method to measure spatially and temporally resolved wavelength emitted from a laser diode array has been developed and is used to determine local temperature transients. This approach involves the non-contact rastering of a 100μm aperture over the emitting surface of the array, passing the energy from a single emitter into a spectrograph. This paper describes the design and development of the spatially and temporally resolved wavelength measurement system that is unique to any system presented in the literature. Results from a validation study of this methodology based on a comparison of wavelength and intensity maps to well-established and calibrated time and spatially averaged LDA measurement techniques and IR images are presented. In turn, preliminary results from this system show that transient laser diode emitter behavior falls into a number of distinct categories. A system that can resolve localized heating of a laser diode array both spatially and temporally can provide a wealth of information about the thermal performance of these arrays: 1) precise mapping of array temperature and relative output power, 2) precise location of hot spots and accurate measurement of the magnitude of those hot spots, and 3) variations in thermal time constants that may predict the location of packaging defects along the heat flow path from the diode bar itself to the LDA heat sink. This paper was also originally published as part of the Proceedings of the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems.
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ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems
July 17–22, 2005
San Francisco, California, USA
Conference Sponsors:
- Heat Transfer Division and Electronic and Photonic Packaging Division
ISBN:
0-7918-4734-9
PROCEEDINGS PAPER
Spatially and Temporally Resolved Temperature Measurement of Laser Diode Arrays
Jason Carter,
Jason Carter
Pennsylvania State University, Freeport, PA
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David Snyder
David Snyder
Pennsylvania State University, Freeport, PA
Search for other works by this author on:
Jason Carter
Pennsylvania State University, Freeport, PA
David Snyder
Pennsylvania State University, Freeport, PA
Paper No:
HT2005-72162, pp. 789-803; 15 pages
Published Online:
March 9, 2009
Citation
Carter, J, & Snyder, D. "Spatially and Temporally Resolved Temperature Measurement of Laser Diode Arrays." Proceedings of the ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. Heat Transfer: Volume 4. San Francisco, California, USA. July 17–22, 2005. pp. 789-803. ASME. https://doi.org/10.1115/HT2005-72162
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