Missions

The recuited person will have to develop a setup of digital holography for acousto-optic imaging, in partnership with colleagues from the laboratory Charles Fabry (LCF – Institut d'Optique – Palaiseau) in order to use it with novel powerful QCW lasers sources, in the context of an ANR fundings.
The candidate will also have to develop structured ultrasound excitation codes, with test in Langevin, then transfer to LCF for AO-experiments.

Activités

- Development of a digital holographic setup / characterization
- Development of original ultrasonic excitation codes on a fully programmable ultrasound imaging device
- Ultrasound performances
- Interfacing / synchronization of apparatus for acousto-optic measurements
- Transfer of the setup to LCF
- Acousto-optic measurements with QCW laser sources

Compétences

Required skills : A strong experimental profile is expected.
Instrumental Optics, Camera processing, Images processing, Coding/development, scientific apparatus interfacing.

Contexte de travail

Acousto-optic imaging (AO) is envisioned to develop a bimodal imaging for medicine and biology, combining complementary informations (ultrasound) and optical (acousto-optic effect). Multiple configurations have been undertaken, but some technological bottlenecks restrain to the proof of principle due to the weak signal over an important background. A key point is the laser source, which must be highly monochromatic (MHz) in the 700-1100nm, powerful within a limited time (10W and more) corresponding to the speckle decorrelation-time in vivo (some 100 microseconds). No such lasers are available on the market. A camera detection is promising (with digital holography), optimised with GPU for the data treatment. Particular US-excitations (e.g. plane-waves) optimize the signal, and remain in-vivo compatible.

Contraintes et risques

Measurements with powerful lasers sources (use of security glasses)
Mobility required since activity is distributed between Institut Langevin and Laboratory Charles Fabry.