Using Doppler shift induced by Galvanometric mirror scanning to reach shot noise limit with laser optical feedback imaging setup

O Jacquin 1 E Lacot 1 O Hugon 1 H Guillet de Chatelus 1
1 LIPhy-OPTIMA
LIPhy - Laboratoire Interdisciplinaire de Physique [Saint Martin d’Hères]
Abstract : This paper proposes what we believe is a new method to remove the contribution of parasitic reflections in the images of the laser optical feedback imaging (LOFI) technique. This simple method allows us to extend the LOFI technique to long-distance applications, as imaging through a fog or a smoke. The LOFI technique is an ultrasensitive imaging technique that is interesting for imaging objects through a scattering medium. However, the LOFI sensitivity can be dramatically limited by parasitic optical feedback occurring in the experimental setup. In previous papers [Appl. Opt. 48, 64 (2009), Opt. Lett. 37, 2514 (2012)], we already have proposed methods to filter a parasitic optical feedback, but they are not well suited to metric working distances. This new method uses a Doppler frequency shift induced by the moving mirror used to scan the object to be imaged. Using this Doppler frequency shift, we can distinguish the photons reflected by the target and the parasitic photons reflected by the optical components in the experimental setup. In this paper, we demonstrated theoretically and experimentally the possibility to filter the parasitic reflection in LOFI images using the Doppler frequency shift. This method significantly improves the signal-to-noise ratio by a factor 15 and we can obtain a shot noise limited image through a scattering medium of an object at 3 m from the detector.
Document type :
Journal articles
Complete list of metadatas

https://hal.archives-ouvertes.fr/hal-01130641
Contributor : Sylvie Costrel de Corainville <>
Submitted on : Friday, March 13, 2015 - 3:43:26 PM
Last modification on : Tuesday, September 11, 2018 - 9:24:02 AM
Long-term archiving on : Sunday, June 14, 2015 - 10:10:21 AM

File

Using the LOFI with Doppler sh...
Files produced by the author(s)

Identifiers

Collections

Citation

O Jacquin, E Lacot, O Hugon, H Guillet de Chatelus. Using Doppler shift induced by Galvanometric mirror scanning to reach shot noise limit with laser optical feedback imaging setup. Applied optics, Optical Society of America, 2015, 54 (8), pp.1978-1983. ⟨10.1364/AO.54.001978⟩. ⟨hal-01130641⟩

Share

Metrics

Record views

181

Files downloads

258