10-W pulsed operation of substrate emitting photonic-crystal quantum cascade laser with very small divergence


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… (More)
DOI: 10.1186/s11671-015-0877-4

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