A double-layered xerographic photoreceptor has been investigated to obtain high sensitivity in the near-infrared region. The immersion of sublimed chloroaluminum phthalocyanine chloride (AlClPcCl) in an organic solvent was found to induce an absorption peak shift toward the long wavelength region. The new double-layered photoreceptor, in which AlClPcCl and a pyrazoline derivative were employed in the charge generation layer and charge transport layer, respectively, showed a high sensitivity, equivalent to 1.6 cm2/μJ, in the GaAlAs laser diode emission region.
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A new type of tomography system based on optical frequency-domain reflectometry is presented. Using an area sensor, the system can simultaneously measure three-dimensional reflectivity distributions in scattering media without the need for mechanical scanning. In preliminary experiments we demonstrate that a target (resolution chart) placed behind biological tissue can be imaged with high depth resolution (47 microm) for a short measurement time.
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