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Wavefront coding technique for controlling thermal defocus aberration in an infrared imaging system.

Shouqian Chen1, Zhigang Fan, Zhigao Xu

  • 1Research Center for Space Optics Engineering, Harbin Institute of Technology, Heilongjiang, Harbin 150001, China. csq_hit@163.com

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Wavefront coding controls thermal defocus in infrared imaging systems. This athermalized long wave infrared optical system design uses a cubic phase mask for stable performance across a wide temperature range.

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Area of Science:

  • Optical Engineering
  • Infrared Imaging Systems
  • Aberration Control

Background:

  • Infrared (IR) imaging systems often suffer from thermal defocus aberrations due to temperature fluctuations.
  • Maintaining optical system performance across a wide temperature range is critical for reliable IR imaging applications.
  • Traditional athermalization methods can be complex and may compromise optical quality.

Purpose of the Study:

  • To investigate the use of wavefront coding for controlling thermal defocus aberration in IR imaging systems.
  • To present a design methodology for athermalized systems utilizing wavefront coding.
  • To demonstrate an athermalized long wave IR optical system design using a cubic phase mask.

Main Methods:

  • A wavefront coding approach was employed to manage thermal defocus.
  • A cubic phase mask was integrated into the optical design.
  • Computer simulations and experimental validation were performed to assess system performance.

Main Results:

  • The designed athermalized long wave IR optical system demonstrated effective control of thermal defocus.
  • The system maintained performance across a temperature range of -40 °C to 60 °C.
  • Experimental results verified the performance predicted by computer simulations.

Conclusions:

  • Wavefront coding is a viable technique for developing athermalized IR imaging systems.
  • The cubic phase mask approach enables robust thermal defocus aberration control.
  • Further research is needed to address implementation challenges for practical applications.