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-...

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Detalles Bibliográficos
Autores principales: Yao, Dan-Yang, Zhang, Jin-Chuan, Cathabard, Olivier, Zhai, Shen-Qiang, Liu, Ying-Hui, Jia, Zhi-Wei, Liu, Feng-Qi, Wang, Zhan-Guo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer US 2015
Materias:
Nano Express
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4402689/
https://www.ncbi.nlm.nih.gov/pubmed/25977652
http://dx.doi.org/10.1186/s11671-015-0877-4
Descripción
Sumario: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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