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Boosting projection contrast method for co-aperture infrared optical engine design.

Yue Pan1, Zhenyu Wang1, Xiping Xu1

  • 1School of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun, Jilin 130022, China.

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Summary

Diffraction limits contrast in digital micromirror device (DMD) infrared scene projectors (IRSPs). This study enhances IRSP contrast by analyzing diffraction, optimizing optical design, and validating results experimentally for improved hardware-in-the-loop simulations.

Keywords:
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Area of Science:

  • Optical Engineering
  • Infrared Technology
  • Digital Optics

Background:

  • Digital micromirror devices (DMDs) are crucial for infrared scene projectors (IRSPs).
  • DMD diffraction characteristics significantly reduce projection contrast, limiting their use in hardware-in-the-loop (HWIL) simulations for advanced infrared imaging systems.
  • Current IRSPs struggle to meet the contrast requirements for rigorous testing.

Purpose of the Study:

  • To enhance the projection contrast of a dual-DMD based infrared optical engine.
  • To address the limitations imposed by diffraction in DMD-based IRSPs.
  • To improve the performance of IRSPs for accurate HWIL simulations.

Main Methods:

  • Applied diffraction analysis to optimize DMD optical efficiency by calculating diffraction directions.
  • Optimized a two-element achromatic total internal reflection (ATIR) prism group for optimal illumination angles.
  • Traced diffracted beams under off-state micromirror conditions to assess irradiation distribution.

Main Results:

  • Successfully boosted projection contrast in the dual-DMD infrared optical engine.
  • Achieved optimal illumination incident angles through ATIR prism group optimization based on diffraction calculations.
  • Demonstrated that irradiation distribution closely matches theoretical levels without diffraction, validating the approach.

Conclusions:

  • The diffraction analysis and optical optimization effectively enhance projection contrast in DMD-based IRSPs.
  • The developed method provides a viable solution for improving IRSP performance in HWIL simulations.
  • This contrast-boosting technique is applicable to other DMD-based optical instrument designs.