Optics, Quantum Electronics

Technical Physics

, Volume 55, Issue 10, pp 1472-1477

First online:

Liquid-crystal display as a spectral selector for visible spectrometers

  • Gopalkrishna HegdeAffiliated withDepartment of Aerospace Engineering, Indian Institute of Science Email author 

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The polarization properties of a twisted nematic liquid crystal display (TNLCD) are studied experimentally with the aim of using it as a wavelength selector. The output of a white LED is split into its constituent wavelengths with a resolution of 2–5 nm in proportion to a voltage applied to the TNLCD. The feasibility of employing the display as a wavelength selector in visible spectrometers is demonstrated. A simple inexpensive design of a spectrometer built around an LED and a TNLCD is suggested.