Synthetic aperture laser optical feedback imaging using a translational scanning with galvanometric mirrors

Wilfried Glastre (1) , Olivier Jacquin (2) , Olivier Hugon (2) , Hugues Guillet de Chatellus (1) , Eric Lacot (2)

1 LIPhy - Laboratoire Interdisciplinaire de Physique [Saint Martin d’Hères]
2 OPTIMA-LIPhy - OPTique et IMAgeries [Grenoble]

In this paper we present an experimental setup based on Laser Optical Feedback Imaging (LOFI) and on Synthetic Aperture (SA) with translational scanning by galvanometric mirrors for the purpose of making deep and resolved images through scattering media. We provide real 2D optical synthetic-aperture image of a fixed scattering target with a moving aperture and an isotropic resolution. We demonstrate theoretically and experimentally that we can keep microscope resolution beyond the working distance. A photometric balance is made and we show that the number of photons participating in the final image decreases with the square of the reconstruction distance. This degradation is partially compensated by the high sensitivity of LOFI.

Domaines: Optique [physics.optics]

Wilfried Glastre, Olivier Jacquin, Olivier Hugon, Hugues Guillet de Chatellus, Eric Lacot. Synthetic aperture laser optical feedback imaging using a translational scanning with galvanometric mirrors. Journal of the Optical Society of America. A Optics, Image Science, and Vision, 2012, 29 (8), pp.1639-1647. ⟨hal-00709620v1⟩