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Standoff photoacoustic chemical detection using quantum cascade lasers is demonstrated. With 40 mW power the detection distance is extended from 1–2 inches to, currently, 17 feet through component and acoustic coupling improvement.
A portable Surface Plasmon Resonance (SPR) instrument based on a monolithic scanner chip — LM9833 was developed. With this compact design, the instrument can provide 16 bit grayscale resolution at 100 frames per second, support up to 16384 pixels linear CCD sensor, enable illumination control and USB interface. The instrument performance was tested and the refractive index sensitivity is about 6×10...
Leakage current in quantum-cascade-lasers with oxide-blocked-ridge waveguide and buried-heterostructure (with/without n-InP top-cover) are compared using electrical derivative measurements. Oxide-blocking structure provides the least leakage current although the top-covered BH QCLs show the toughest durability.
Testing QCL devices usually requires cryogenic systems, mid-IR windows, optics and detectors. We report here the demonstration of an electrical derivative method that can quickly measure QCL lasing thresholds without using mid-IR optics or detectors.
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