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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Infrared modulation by means of frustrated total internal reflection.

R W Astheimer1, G Falbel, S Minkowitz

  • 1Barnes Engineering Company, Stamford,Connecticut, USA.

Applied Optics
|January 6, 2010
PubMed
Summary

This study presents a novel infrared modulation cell using frustrated internal reflection, eliminating mechanical parts for space applications. It achieves 80% modulation of 10-micrometer radiation with a high-frequency response.

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Area of Science:

  • Optics and Photonics
  • Infrared Technology
  • Mechanical Engineering

Background:

  • Traditional infrared systems rely on mechanical choppers or scanners.
  • Space applications necessitate the elimination of sliding or rotating mechanical components.
  • Frustrated internal reflection offers a non-mechanical modulation alternative.

Purpose of the Study:

  • To develop and characterize a novel modulation cell for infrared radiation.
  • To eliminate mechanical components in infrared modulation systems for space suitability.
  • To demonstrate the practicality of frustrated internal reflection in the 8-12 micrometer range.

Main Methods:

  • Utilized the principle of frustrated internal reflection for radiation modulation.
  • Constructed a modulation cell with a 12.7 mm clear aperture.
  • Employed a lead zirconate titanate piezoelectric stack for precise element movement.

Main Results:

  • Achieved 80% modulation of 10-micrometer infrared radiation.
  • Demonstrated the feasibility of controlling motions at the 0.05 wavelength scale in the infrared spectrum.
  • Obtained a frequency response exceeding 6 kHz.

Conclusions:

  • Frustrated internal reflection is a practical method for infrared modulation, especially in the 8-12 micrometer range.
  • The developed modulation cell effectively replaces traditional mechanical systems.
  • The piezoelectric-driven cell offers high-frequency response suitable for demanding applications.