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Nonlinear optical microscopy with an obscuration-free, freeform reflective objective.

Yryx Y Luna Palacios1, Tuyet N A Hoang1, Salile Khandani2

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Summary

Researchers developed an obscuration-free reflective microscope objective for nonlinear optical (NLO) imaging. This innovative design overcomes limitations of traditional refractive and reflective objectives, enhancing imaging quality and transmission.

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Area of Science:

  • Optics and Photonics
  • Microscopy
  • Biomedical Imaging

Background:

  • Refractive microscope objectives in nonlinear optical (NLO) imaging suffer from chromatic aberrations and temporal dispersion, limiting performance.
  • Existing reflective objectives, while achromatic, have central obscurations that reduce throughput and introduce diffraction artifacts.
  • Current limitations restrict NLO imaging, particularly for short- to mid-wave infrared excitation.

Purpose of the Study:

  • To develop an improved reflective microscope objective for NLO imaging.
  • To overcome the limitations of central obscuration in conventional reflective designs.
  • To provide an achromatic and dispersion-free alternative for NLO microscopy.

Main Methods:

  • Designed a reflective microscope objective using freeform mirrors in a non-coaxial geometry.
  • Eliminated central obscuration present in traditional reflective objectives.
  • Integrated the freeform objective into a standard laser-scanning microscope for NLO imaging.

Main Results:

  • Achieved an obscuration-free design with a 0.65 numerical aperture (NA).
  • Demonstrated near diffraction-limited imaging performance with improved transmission and wider fields-of-view.
  • Successfully performed NLO microscopy across a broad range of excitation wavelengths, outperforming standard reflective designs.

Conclusions:

  • The developed freeform reflective microscope objective is a superior alternative to refractive lenses for NLO imaging.
  • This obscuration-free design enhances imaging quality, signal brightness, and transmission range.
  • Enables advanced NLO microscopy applications, particularly in the short- to mid-wave infrared spectrum.