Laser optical feedback imaging with Nd3+:YAG microlaser

Laser optical feedback imaging with Nd3+:YAG microlaser

Olivier Jacquin Olivier Hugon Vadim Girardeau Eric Lacot 

Laboratoire Interdisciplinaire de Physique, Université Grenoble-Alpes,CNRS 140 av. de la Physique, 38402 Saint Martin d’Hères, France

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The LOFI setup (Laser Optical Feedback Imaging) is a very sensitive heterodyne interferometer which involves the dynamics of lasers. In this imaging system, the optical beat occurs inside the laser cavity, between the intracavity light and the light backscattered by the target. By this way, the laser is the source and also the detector, which implies that it is very easy to use (this optical system is self-aligned) and the measures are only limited by “shotnoise”. This technique allows doing images of reflectivity and images of phase in difficult conditions, as imaging through diffusive media or imaging of very weakly reflective targets. In this manuscript, several setups are described in order to reach the “shot-noise” limit, and we show many results of applications like the imaging through diffusive media, the vibrometry and the synthetic aperture.


heterodyne interferometry, laser imaging, optical feedback, vibrometry, noncontact testing, scattering media, laser dynamics, synthetic aperture.

1. Technique LOFI
2. Applications de la technique LOFI
3. Conclusion

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