Detecting pollution with a compact laser source

Researchers at EPFL have developed a simple mid-infrared laser source that can be used to detect pollution in the air or molecules in someone's breath. Their system takes up considerably less space than the large ones typically used for such tasks. Researchers at EPFL have come up with a new middle infrared light source that can detect greenhouse and other gases, as well as molecules in a person's breath. The compact system, which resembles a tiny suitcase, contains just two parts: a standard laser together with a photonic chip measuring a few millimeters across. The research is detailed in an article published . The mid-infrared spectrum is especially useful for scientists because, at this wavelength range, light can detect particles that play an important role in the environment and in human health. Until now, however, infrared laser systems have proven difficult to transport because they involve complex, damage-prone hardware.