21 research outputs found
Detection of the tagged or untagged photons in acousto-optic imaging of thick highly scattering media by photorefractive adaptive holography
We propose an original adaptive wavefront holographic setup based on the
photorefractive effect (PR), to make real-time measurements of acousto-optic
signals in thick scattering media, with a high flux collection at high rates
for breast tumor detection. We describe here our present state of art and
understanding on the problem of breast imaging with PR detection of the
acousto-optic signal
Mapping the rotational diffusion of fluorophores in cells with time-resolved wide-field fluorescence anisotropy imaging
CLEO/EUROPE ; EQEC European Quantum Electronics Conference, Munich ICM, Germany, 22-27 June, 2003N
Theoretical study of Acousto-optical coherence tomography using random phase jumps on US and light
Acousto-Optical Coherence Tomography (AOCT) is variant of Acousto Optic
Imaging (called also ultrasonic modulation imaging) that makes possible to get
z resolution with acoustic and optic Continuous Wave (CW) beams. We describe
here theoretically the AOCT e ect, and we show that the Acousto Optic tagged
photons remains coherent if they are generated within a speci c z region of the
sample. We quantify the z selectivity for both the tagged photon eld, and for
the M. Lesa re et al. photorefractive signal
Laser Nd:YVO impulsionnel à 914 nm pompé par diode
Nous présentons ici le premier laser impulsionnel à
verrouillage de modes en phase passif directement pompé par
diode, utilisant la transition FI de
l'ion néodyme à 914 nm. Le système de pompage
utilisé permet d'obtenir un dispositif simple. Le train
d'impulsions est obtenu grâce à un miroir à absorbant
saturable, l'émission laser à 914 nm étant
privilégiée par l'introduction dans la cavité de fortes
pertes à 1064 nm. Nous obtenons avec notre dispositif des
impulsions à 913.8 nm, de durée 8.8 ps à une cadence
de 94 MHz et à une puissance de 86 mW