Nonlinear effects in acousto-optic imaging.
نویسندگان
چکیده
Acousto-optic (AO) imaging is a promising technique that is able to reveal optical properties in the millimeter range inside scattering media by tagging the photon paths with an ultrasonic beam. To increase both the contrast and the resolution of the AO images, we have explored the possibility of using the nonlinear response of the speckle modulation. Variation of the second-harmonic signal as the square of the ultrasonic amplitude has been found, and strong reduction of the tagged zone size has been demonstrated.
منابع مشابه
1 Ja n 20 09 Detection of the tagged or untagged photons in acousto - optic imaging of thick highly scattering media by photorefractive adaptive holography
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. W...
متن کاملDesign and Implementation of a High-Speed Solid-State Acousto-Optic Interference Pattern Projector for Three-Dimensional Imaging
A novel method of projecting interference patterns using acousto-optics has been developed and implemented in the context of the Accordion Fringe Interferometry (AFI) three-dimensional measurement technique developed at MIT Lincoln Laboratory. AFI is an active technique that relies on projecting interference fringes and triangulation to recover range information. AFI is suitable for a wide rang...
متن کاملTheoretical study of acousto-optical coherence tomography using random phase jumps on ultrasound and light.
Acousto-optical coherence tomography (AOCT) is a variant of acousto-optic imaging (also called ultrasonic modulation imaging) that makes it possible to get the z resolution with acoustic and optic continuous wave beams. We describe here theoretically the AOCT effect, and we show that the acousto-optic "tagged photons" remain coherent if they are generated within a specific z region of the sampl...
متن کاملQuadrature Detection of Ultrasound-Modulated Photons with a Gain-Modulated, Image-Intensified, CCD Camera
Acousto-optic imaging promises to provide in vivo images of optical contrast but with the superior spatial resolution of ultrasound imaging. Here we present novel quadrature detection of ultrasound-modulated photons with a gainmodulated, image-intensified, CCD camera. The additional detection of ultrasound-modulated fluorescence photons demonstrates potential for in vivo acousto-optic molecular...
متن کاملDetection 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 the art and understanding on the problem of breast imaging with PR detection of the acousto-optic signal.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Optics letters
دوره 27 11 شماره
صفحات -
تاریخ انتشار 2002