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Acousto-Optics

The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform

Byoung Yoon Kim – 1st expert on this subject based on the ideXlab platform

  • Polarization coupling in a highly birefringent photonic crystal fiber by torsional acoustic wave.
    Optics express, 2008
    Co-Authors: Kwang Jo Lee, Kee Suk Hong, Hyun-chul Park, Byoung Yoon Kim

    Abstract:

    We demonstrate and analyze the acousto-optic coupling between two optical polarization modes of the LP(01) mode propagating in a highly birefringent photonic crystal fiber. The coupling is realized based on wavelength selective acousto-optic coupling by traveling torsional acoustic wave in an all-fiber tunable polarization filter configuration. The dispersion properties of the torsional acoustic wave in the photonic crystal fiber and the influence of axial non-uniformity in the modal birefringence on the filter transmission are discussed in detail.

  • All-fiber tunable filter and laser based on two-mode fiber
    Optics Letters, 1996
    Co-Authors: Seok Hyun Yun, In Kag Hwang, Byoung Yoon Kim

    Abstract:

    We demonstrate an all-fiber acousto-optic tunable filter based on two-spatial-mode coupling, with improved ruggedness and efficiency, by using a new acoustic-transducer design. We use a rigorous modeling of the flexural acoustic wave to analyze the mode coupling with better accuracy. Using the acousto-optic tunable filter, we demonstrate a novel all-fiber tunable laser with a tuning range of more than 20 nm and a linewidth of 0.2 nm.

F. Ramaz – 2nd expert on this subject based on the ideXlab platform

  • Ultrafast acousto-optic imaging with ultrasonic plane waves
    Optics Express, 2016
    Co-Authors: Jean-baptiste Laudereau, Alexander A Grabar, Mickael Tanter, Jean Luc Gennisson, F. Ramaz

    Abstract:

    Due to multiple light scattering inside biological tissues, deep non-invasive optical medical imaging is very challenging. Acousto-optic imaging is a technique coupling ultrasound and light that allows recovering optical contrast at depths of few centimeters with a millimeter resolution. Recent advances in acousto-optic imaging are using short focused ultra-sound pulses often averaged over several hundred or thousand pulses. As the pulsing rate of commercial probes is limited to about few ultrasound cycles every 100 µs, acquiring an acousto-optic image usually takes several tens of seconds due to the high number of acoustic pulses excitation. We propose here a new acousto-optic imaging technique based on the use of ultrasound plane waves instead of focused ones that allows increasing drastically the imaging rate.

  • Detection of the tagged or untagged photons in acousto-optic imaging of thick highly scattering media by photorefractive adaptive holography
    The European Physical Journal E, 2009
    Co-Authors: Michel Gross, Micheline Lesaffre, F. Ramaz, Philippe Delaye, Gérald Roosen, Albert Claude Boccara

    Abstract:

    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.

G.h. Song – 3rd expert on this subject based on the ideXlab platform

  • Time-dependent analysis of acousto-optic tunable filters for multichannel optical switching
    Journal of Lightwave Technology, 1997
    Co-Authors: G.h. Song

    Abstract:

    A time-dependent analysis of acousto-optic tunable filters (AOTF’s) for multiwavelength optical-switching operations is presented, it explains the reason for the observed nonlinear behavior such as passband-pulling and quantifies the associated crosstalk performance degradation. The degradation of the filter performance is found to be due to copresence of the acousto-optic interaction profiles for different channels. Along with extensive Poincare-sphere analysis, the model also reveals time-dependent fluctuation of switching spectral responses, which calls for attention to the worst instances in the fluctuation for the wavelength division multiplexer (WDM) optical-switch application.