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6 March 2023 High peak power quantum cascade laser arrays with top-metal distributed Bragg reflector
Arkadiy A. Lyakh, Luke Milbocker, Enrique Cristobal, Hong Shu
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Proceedings Volume PC12372, Optical Fibers and Sensors for Medical Diagnostics, Treatment and Environmental Applications XXIII; PC123720E (2023) https://doi.org/10.1117/12.2653624
Event: SPIE BiOS, 2023, San Francisco, California, United States
Abstract
Due to an unprecedented combination of high power, high efficiency, and small size, Quantum Cascade Lasers (QCLs) finding numerous applications in various mid-wave and long-wave infrared fields. The control of material composition, thickness, and doping level for each layer in the QCL superlattice offers a unique flexibility in optimizing laser characteristics to specific applications. Band gap engineering (laser core design) will be discussed in this talk in the context of spectroscopic applications, including heterogeneous laser core design that allows for either wavelength tuning in a broad spectral region around a single central wavelength or operation on multiple isolated spectral lines with significant spectral separation. The design and fabrication of QCLs with a low-cost top-metal Distributed Bragg Reflector for achieving narrow-spectrum emission will also be presented. Finally, our latest results on monolithic beam combining of multiple DBR QCLs using multi-mode interference and Y-junction couplers for increasing laser tuning range and/or increasing peak optical power will be presented. Employment of the high-power DBR QCL arrays in specific infrared applications will be discussed at the end of the talk.
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Arkadiy A. Lyakh, Luke Milbocker, Enrique Cristobal, and Hong Shu "High peak power quantum cascade laser arrays with top-metal distributed Bragg reflector", Proc. SPIE PC12372, Optical Fibers and Sensors for Medical Diagnostics, Treatment and Environmental Applications XXIII, PC123720E (6 March 2023); https://doi.org/10.1117/12.2653624
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KEYWORDS
Quantum cascade lasers
Distributed Bragg reflectors
Laser applications
Infrared radiation
Laser development
Mid-IR
Quantum efficiency
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