Interband cascade lasers (ICLs) have proven to be efficient semiconductor sources of coherent mid -infrared (mid-IR) radiation. Single mode distributed-feedback (DFB) ICLs are excellent high-resolution spectroscopic sources for targeting important molecular species in the mid-IR fingerprint region, but are limited to a narrow spectral tuning range. Recent developments in multi-heterodyne spectroscopy with multi-mode Fabry-Perot (FP) lasers have enabled significant progress towards broadband high-resolution spectroscopic sensing applications in the mid-infrared. Here, we characterize the mode structure and tuning properties of multi-mode FP-ICLs for the purpose of evaluating the feasibility of ICL-based multiheterodyne spectroscopy.
C. L. Patrick, L. A. Sterczewski, J. Westberg, W. W. Bewley, C. D. Merritt, C. L. Canedy, C. S. Kim, M. Kim, I. Vurgaftman, J. R. Meyer, and G. Wysocki, "Multi-heterodyne spectroscopy using Fabry-Perot interband cascade lasers for trace gas detection: a feasibility assessment," Proc. SPIE 10123, Novel In-Plane Semiconductor Lasers XVI, 101231L (Presented at SPIE OPTO: February 02, 2017; Published: 20 February 2017); https://doi.org/10.1117/12.2252253.
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