Abstract
High-power broad area substrate emitting photonic-crystal distributed feedback (DFB) quantum cascade lasers (QCLs) emitting around 4.73 μm is reported. Two-dimensional centered rectangular photonic-crystal (CRPC) grating is introduced to enhance optical coherence in large area device. Main lobe far-field radiation pattern with a very small divergence angle of about 0.65° × 0.31° is obtained. A record peak output power for vertical emitting QCLs exceeding 10 W is obtained with high reflectivity (HR) coating. Robust single longitudinal mode emission with a side mode suppression ratio (SMSR) of 30 dB is continuously tunable by the heat sink temperature up to 65°C.
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Yao, D. Y., Zhang, J. C., Cathabard, O., Zhai, S. Q., Liu, Y. H., Jia, Z. W., … Wang, Z. G. (2015). 10-W pulsed operation of substrate emitting photonic-crystal quantum cascade laser with very small divergence. Nanoscale Research Letters, 10(1). https://doi.org/10.1186/s11671-015-0877-4
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