Versuchsaufbau: Der Laser (rechts) sendet sein Licht durch einen Testbehälter, danach wird es von einem Spiegel (links) reflektiert und gelangt zurück.
A laser and detector in one: a microscopic sensor has been developed at TU Wien, which can be used to identify different gases simultaneously. The laser (on the right) sends its light through a gas container, then the beam is reflected by a mirror (left). As humans, we sniff out different scents and aromas using chemical receptors in our noses. In technological gas detection, however, there are a whole host of other methods available. One such method is to use infrared lasers, passing a laser beam through the gas to an adjacent separate detector, which measures the degree of light attenuation it causes. TU Wien's tiny new sensor now brings together both sides within a single component, making it possible to use the same microscopic structure for both the emission and detection of infrared radiation. Circular quantum cascade lasers - 'The lasers that we produce are a far cry from ordinary laser pointers ,' explains Rolf Szedlak from the Institute of Solid State Electronics at TU Wien.
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