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Surface recombination velocities and surface temperatures at front facets of standard broad-area lasers emitting at 808nm were investigated by time-resolved two-color photoluminescence and micro-Raman spectroscopy. Surface recombination velocities in the range between <105 and 106cm∕s are determined for devices with tailored surface properties. The results clearly show that increased surface recombination velocities are accompanied by increased facet temperatures. Reabsorption of light generated in the diode lasers leads to an additional enhancement of facet heating for surfaces of minor structural quality. The methodological approach presented here paves the way for improved analytical access to diode laser facet properties.
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Ziegler et al. (2008) studied this question.
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