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Scientists at the University of Arizona and Pacific Northwest National Laboratories used a broadly tunable swept-wavelength external cavity quantum cascade laser (swept-ECQCL) operating in the midwave infrared (MWIR) spectral region to measure transmission through explosive fireballs generated from charges of four different explosive types detonated in an enclosed chamber. The swept-ECQCL’s broad wavelength tuning range allowed the rapid measurement of multiple chemical substances and large molecules in the fireballs.
The high-energy explosives were placed in a specially designed chamber to contain the fireball. The researchers directed a laser beam from the swept-ECQCL through this chamber while rapidly varying the laser…READ MORE