An Optical Spectrum Analyzer (OSA) is an instrument for measuring the spectral characteristics of lasers. The most
common examples are based on the Scanning Fabry-Pérot Interferometer (SFPI), which measures the intensity of
an optical standing wave formed within a mirrored cavity. The analyzer’s control unit sweeps the resonant
wavelength of this cavity at a fixed rate, and the intensity within the cavity is plotted against time to form a picture
of the optical frequency spectrum. View More...