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Meadowlark Optics - Wave Plates 6/24 LB 2024

A Spectrometer That Spans Octaves

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Hank Hogan

Singing the musical scales provides a hint as to why users of grating-based spectrometers must be careful: After beginning with do, the scale ends up back at the same note but an octave higher. In spectrometers, diffraction orders also repeat, and that prevents the measurement of octave-spanning spectra unless bandpass filters are used. In an all-reflective Fourier transform spectrometer developed at Colorado State University, a beam strikes a split mirror, creating a spatial interferogram. Moving the slit samples the interferogram, with the detector measuring it. Because it uses...Read full article

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    Published: April 2007
    Glossary
    photonics
    The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fiber optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and...
    diffraction ordersFeaturesgrating-based spectrometersphotonicsSensors & Detectorsspectroscopy

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