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Commercially available quantum cascade semiconductor materials continue to mature. When integrated into external cavity quantum cascade laser (ECqcL™) geometries, these laser systems are now providing near-continuous coverage throughout the entire 3 -13 µm regime. Such coverage enables molecular detection systems to enjoy high sensitivity and selectivity. Individual lasers have been demonstrated to provide > 320 wavenumbers of tuning. Wide tuning ranges have also been demonstrated at wavelengths in the 3 -4 µm regime. In addition, phase continuous (mode-hop-free) tuning allows for extremely high resolution spectroscopy to be performed throughout the mid-IR. Daylight Solutions will review the most up-to-date results regarding wavelength coverage, tuning range and power levels achieved from ECqcL™ systems. Daylight will also provide recent results in sensitivity and coverage from their multi-species Swept Sensor™ and photoacoustic detection platforms.

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