1. Using a crystal to link visible light to infrared opens a window on infrared sensing

    Using a crystal to link visible light to infrared opens a window on infrared sensing

    A cheap, compact technique for analyzing samples at infrared wavelengths using visible-wavelength components could revolutionize medical and material testing. Infrared spectroscopy is used for material analysis, in forensics and in the identification of historical artifacts, for example,—but scanners are bulky and expensive. Visible- wavelength technology is cheap and accessible in items such as smartphone cameras and laser pointers. This led Leonid Krivitsky and colleagues at the A*STAR Data Storage Institute to develop a method in which a laser beam was converted into two linked lower energy beams: The link between the two beams allowed experiments using one beam ...

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