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2 November 2022 High brightness, broad-area quantum cascade lasers emitting at ~4.0µm (Conference Presentation)
Arkadiy A. Lyakh, Enrique Cristobal, Luke Milbocker
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Proceedings Volume 12273, High-Power Lasers and Technologies for Optical Countermeasures; 122730F (2022) https://doi.org/10.1117/12.2644268
Event: SPIE Security + Defence, 2022, Berlin, Germany
Abstract
Brightness is often listed among the most important laser characteristic for practical applications. It is a function of both output optical power and mode quality. Multi-watt continuous wave (CW) operation has been demonstrated for broad-area Quantum Cascade Lasers (QCLs) emitting at ~4.6µm. Transition of the broad-area configuration to shorter wavelengths is however non-trivial as laser thermal behavior rapidly deteriorates with reduction in emission wavelength below 4.6µm. In this work we discuss the main design principles of high brightness, broad area QCLs emitting at ~4.0µm. Building off a power scaling approach to increasing broad area QCL CW power, a figure of merit is utilized to predict dominant lasing transverse modes for QCLs. A discussion follows on the role of laser core dimensions on mode selection within a waveguide, including design guidelines for maintaining single transverse mode behavior while altering broad area QCL design for increased power.
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Arkadiy A. Lyakh, Enrique Cristobal, and Luke Milbocker "High brightness, broad-area quantum cascade lasers emitting at ~4.0µm (Conference Presentation)", Proc. SPIE 12273, High-Power Lasers and Technologies for Optical Countermeasures, 122730F (2 November 2022); https://doi.org/10.1117/12.2644268
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KEYWORDS
Quantum cascade lasers
Continuous wave operation
Laser applications
Waveguides
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