The presence and concentration of a number of gases can be detected by measuring the absorption of mid-infrared light with wavelengths near 4 µm. We have developed intense and inexpensive light sources based on quantum cascade lasers (QCLs).<br><br> <strong>Technology</strong><br> The QCL is a new type of semiconductor quantum-well inter-subband device, with a unique material combination and sequence with very large energetic separation of subbands. The QCL-structures have wavelengths between 3-5 µm, emitting within the first atmospheric window. Besides the sensing of organic gases, laser emission in the first atmospheric window has application in free space communication, collision-avoidance radars, cruise-controllers, targeting and “blinding” infrared detectors and cameras. <br><br>
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