Microthermographic investigations of aging processes in diode lasers

Anna Kozlowska; Jens W. Tomm; Andrzej Maląg

doi:10.1117/12.685120

19 October 2006 Microthermographic investigations of aging processes in diode lasers

Anna Kozlowska, Jens W. Tomm, Andrzej Maląg

Proceedings Volume 6368, Optoelectronic Devices: Physics, Fabrication, and Application III; 63680B (2006) https://doi.org/10.1117/12.685120
Event: Optics East 2006, 2006, Boston, Massachusetts, United States

Abstract

The application of multi-spectral microthermography to the monitoring of aging processes in diode lasers is reported. We have found that an intensity of the luminescence in near IR (1.5 -2 micron range) increases with the operational time, which tentatively is correlated with increased concentration of point defects. This effect is monitored with a specially configured thermographic camera. The set-up provides spatially resolved information about the luminescence that originates from radiative recombination at defect centers as well as the pure thermal emission. In order to elucidate the role of point defects in the aging process of diode laser complementary spectroscopic measurements are performed. Photocurrent spectroscopy is used to examine the absorption properties of laser structure for fresh as well for aged devices. The results of low-current I-V characterization are presented. A correlation between measurement results obtained using different methods is found, discussed and interpreted in detail.

Citation Download Citation

Anna Kozlowska, Jens W. Tomm, and Andrzej Maląg "Microthermographic investigations of aging processes in diode lasers", Proc. SPIE 6368, Optoelectronic Devices: Physics, Fabrication, and Application III, 63680B (19 October 2006); https://doi.org/10.1117/12.685120

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