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InAs-based single-mode distributed feedback (DFB) interband cascade (IC) lasers were investigated. The DFB grating was patterned using interference lithography to etch the cladding-free upper separate confinement layer of the IC laser structure. Single-mode emission with a side mode suppression ratio of $\sim 30$ dB was obtained in continuous wave operation at temperatures up to 180 K near 4.5 ...
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