We present recent results on development of swept external cavity quantum cascade lasers (ECQCLs) for rapid and precise measurements of trace gases. Rapid tuning of a swept-ECQCL over its entire tuning range at rates up to 100 Hz and a spectral resolution of <0.2 cm-1 provides an important capability for detection of gas mixtures in transient sources such as chemical plumes. We present examples of using the swept-ECQCL for quantitative measurements of multicomponent gas-phase mixtures in turbulent plumes for standoff detection applications.
Mark C. Phillips and Brian E. Brumfield, "ECQCL developments for rapid standoff chemical sensing," Proc. SPIE 10194, Micro- and Nanotechnology Sensors, Systems, and Applications IX, 101942T (Presented at SPIE Defense + Security: April 13, 2017; Published: 18 May 2017); https://doi.org/10.1117/12.2263701.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon