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High contrast ratio optimized total internal reflection prism for compact medium-wave IR target simulation system.

Zongyu Du1, Gaofei Sun1,2,3, Songzhou Yang1,2,3

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Summary

This study introduces an optimized total internal reflection (TIR) prism to enhance imaging contrast in medium-wave infrared (MWIR) target simulation systems. The new design significantly improves simulated image quality and contrast ratio for infrared targets.

Keywords:
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Area of Science:

  • Optics and Photonics
  • Infrared Technology
  • Optical Engineering

Background:

  • Existing total internal reflection (TIR) prisms in medium-wave infrared (MWIR) target simulation systems suffer from low imaging contrast ratios, degrading simulated image quality.
  • This limitation impacts the effectiveness of infrared target simulation for various applications.

Purpose of the Study:

  • To propose and design an optimized TIR (OTIR) prism using Snell's law to overcome the low contrast ratio issue in MWIR target simulation.
  • To enhance the imaging contrast and overall quality of simulated infrared targets.

Main Methods:

  • Developed an optimized TIR (OTIR) prism design based on Snell's law for MWIR applications.
  • Utilized radiation theory to create a constraint model for the OTIR prism within the simulation system.
  • Investigated the impact of digital micromirror device states on beam direction and derived design equations for a three-prism OTIR configuration.

Main Results:

  • Simulations confirmed that the OTIR prism enhances the contrast ratio in compact MWIR target simulation systems.
  • Experimental verification demonstrated an output contrast ratio of approximately 298:1 at 700 K.
  • The contrast ratio consistently increased with rising light source temperature within the tested range.

Conclusions:

  • The designed OTIR prism effectively improves the contrast ratio of MWIR target simulation systems.
  • This advancement leads to higher quality simulated infrared target images.
  • The OTIR prism offers a practical solution for enhancing infrared target simulation fidelity.