Abstract
We report on the development and performance of a high power, widely tunable, continuous wave external cavity quantum cascade laser (EC-QCL) designed for infrared vibrational spectroscopy of molecules exhibiting broadband and single line absorption features [1]. The laser is characterized and applied to high resolution spectroscopy and wide tunability for trace gas detection in the mid infrared wavelength region between 7 and 8.8 µm. The laser source exhibits single mode operation with a tunability up to 303 cm−1 (~ 24% of the center wavelength) at 8 µm, with a maximum optical output power of 200 mW. In combination with off-axis integrated output spectroscopy, trace-gas detection of broadband absorption gases such as acetone was performed and a noise equivalent absorption sensitivity of NEAS = 3.7 · 10−8 cm−1 Hz−1/2 was obtained.
© 2015 IEEE
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