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Extraction of Quasi-Straightforward-Propagating Photons Through a Scattering Medium by Up-Conversion Method as a Coherent Light Detection Technique |
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| Authors: | Kenji WADA Yoshihiro MlSHINA Shigenori FUJIWARA Hiromichi HORINAKA Yoshio CHO Tokuo UMEDA |
| Institution: | (1) Faculty of Engineering, Osaka Prefecture University, Department of Physics and Electronics, Gakuen-cho, 1-1, Sakai, Osaka 599-8531, Japan;(2) Oyokoden Applied Photonics Lab Co., Ltd., 5301, Haga, Okayama, Okayama 701-12, Japan;(3) School of Allied Health Sciences, KITASATO University, 1-15-1, Kitasato, Sagamihara, Kanagawa 228-8555, Japan |
| Abstract: | Aiming at the realization of optical CT (computed tomography), the extraction of quasi-straightforward-propagating photons from optical pulses transmitting through a standard scattering medium of Intralipid-10% aqueous solution has been demonstrated by an up-conversion method (second harmonic generation). We have found that this operates as a coherent light detection method rather than a time-gate one and extends the dynamic range where the Lambert-Beer’s law holds to − 86 dB. We have also proposed improvements to obtain the largest possible dynamic range by such an up-conversion technique. |
| Keywords: | optical CT scattering quasi-straight-forward-propagating photons up-conversion coherent light detection |
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