Stable Single-Mode Operation of Distributed Feedback Quantum Cascade Laser by Optimized Reflectivity Facet Coatings

In this work, quantum cascade lasers (QCLs) based on strain compensation combined with two-phonon resonance design are presented. Distributed feedback (DFB) laser emitting at ~ 4.76 μm was fabricated through a standard buried first-order grating and buried heterostructure (BH) processing. Stable sin...

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Detalles Bibliográficos
Autores principales: Wang, Dong-Bo, Zhang, Jin-Chuan, Cheng, Feng-Min, Zhao, Yue, Zhuo, Ning, Zhai, Shen-Qiang, Wang, Li-Jun, Liu, Jun-Qi, Liu, Shu-Man, Liu, Feng-Qi, Wang, Zhan-Guo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer US 2018
Materias:
Nano Express
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5796954/
https://www.ncbi.nlm.nih.gov/pubmed/29396762
http://dx.doi.org/10.1186/s11671-018-2455-z
Descripción
Sumario:In this work, quantum cascade lasers (QCLs) based on strain compensation combined with two-phonon resonance design are presented. Distributed feedback (DFB) laser emitting at ~ 4.76 μm was fabricated through a standard buried first-order grating and buried heterostructure (BH) processing. Stable single-mode emission is achieved under all injection currents and temperature conditions without any mode hop by the optimized antireflection (AR) coating on the front facet. The AR coating consists of a double layer dielectric of Al(2)O(3) and Ge. For a 2-mm laser cavity, the maximum output power of the AR-coated DFB-QCL was more than 170 mW at 20 °C with a high wall-plug efficiency (WPE) of 4.7% in a continuous-wave (CW) mode.

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