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Coherent microscopy by laser optical feedback imaging (LOFI) technique.

O Hugon1, F Joud, E Lacot

  • 1UJF-Grenoble 1/CNRS, LIPhy UMR 5588, Grenoble, F-38041, France. olivier.hugon@ujf-grenoble.fr

Ultramicroscopy
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Summary

Laser optical feedback imaging (LOFI) is applied to coherent microscopy, enabling image acquisition through sample scanning. This method addresses scanning-induced signal distortions and proposes a phase-image-based monitoring technique for optimal scanner positioning.

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Area of Science:

  • Coherent microscopy
  • Optical imaging techniques
  • Laser-based imaging

Background:

  • Coherent microscopy offers high-resolution imaging.
  • Non-conventional imaging techniques are needed to enhance microscopy capabilities.
  • Laser optical feedback imaging (LOFI) is an emerging technique.

Purpose of the Study:

  • To present the application of LOFI to coherent microscopy.
  • To analyze scanning-induced artifacts in LOFI.
  • To propose a method for optimizing scanner position in LOFI.

Main Methods:

  • Implementation of LOFI with frequency-shifted optical feedback.
  • Scanning of the sample using galvanometric mirrors.
  • Analysis of magnitude and phase signals for artifacts like vignetting and field curvature.
  • Development of a phase-image-based monitoring method.

Main Results:

  • LOFI can be successfully applied to coherent microscopy.
  • Scanning with galvanometric mirrors introduces vignetting and field curvature.
  • A phase-image monitoring method effectively identifies the optimal scanner position.
  • Experimental results demonstrate the feasibility and effectiveness of the LOFI technique.

Conclusions:

  • LOFI is a viable and efficient technique for coherent microscopy.
  • Understanding and mitigating scanning artifacts is crucial for image quality.
  • The proposed monitoring method enhances the practical application of LOFI.