Coherent microscopy by laser optical feedback imaging (LOFI) technique

TL;DR

This paper presents the application of Laser Optical Feedback Imaging (LOFI) for coherent microscopy, demonstrating its simplicity, efficiency, and methods to optimize scanning, with experimental validation of the technique.

Contribution

The paper introduces the use of LOFI for coherent microscopy, including a phase-based monitoring method and analysis of scanning effects, which is a novel application of this imaging technique.

Findings

LOFI enables coherent microscopy with simple setup.

A phase-based method helps optimize scanner positioning.

Experimental results validate the effectiveness of LOFI in microscopy.

Abstract

The application of the non conventional imaging technique LOFI (Laser Optical Feedback Imaging) to coherent microscopy is presented. This simple and efficient technique using frequency-shifted optical feedback needs the sample to be scanned in order to obtain an image. The effects on magnitude and phase signals such as vignetting and field curvature occasioned by the scanning with galvanometric mirrors are discussed. A simple monitoring method based on phase images is proposed to find the optimal position of the scanner. Finally, some experimental results illustrating this technique are presented.