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Generating light with a specified spectral power distribution.

Ivar Farup1, Jan Henrik Wold, Thorstein Seim

  • 1Gjøvik University College, P.O. Box 191, N-2802 Gjøvik, Norway. ivar.farup@hig.no

Applied Optics
|April 13, 2007
PubMed
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A new spectral integrator uses a xenon lamp, prisms, and a computer-controlled LCD to precisely shape light spectra. This closed-loop system achieves 1%-20% spectral power distribution errors, advancing optical metrology.

Area of Science:

  • Optical Engineering
  • Spectroscopy
  • Metrology

Background:

  • Accurate spectral control is crucial for various scientific and industrial applications.
  • Existing spectral manipulation techniques may lack precision or flexibility.

Purpose of the Study:

  • To design and develop a novel spectral integrator capable of generating specific spectral power distributions.
  • To implement a closed-loop system for precise control and measurement of generated spectra.

Main Methods:

  • Utilized a xenon lamp, dispersing prisms, and a transmissive liquid crystal display (LCD) panel for spectral filtering.
  • Developed a computer algorithm to control the LCD for masking specific light fractions.
  • Integrated a spectroradiometer for real-time spectral measurement, creating a closed-loop feedback system.

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Main Results:

  • The spectral integrator successfully generated light with specified spectral power distributions.
  • Relative root-mean-square (rms) errors between 1% and 20% were achieved, varying with the target spectrum's complexity.
  • The closed-loop system demonstrated effective control over the spectral output.

Conclusions:

  • The designed spectral integrator offers a flexible and precise method for generating custom light spectra.
  • The system's performance is suitable for applications requiring controlled spectral power distributions.
  • Further refinement of the algorithm may reduce spectral generation errors for complex distributions.