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🏛️國立陽明交通大學機構典藏

Access type: Metadata onlyAuthor: search.filters.author.Hsu, KY

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Now showing 1 - 7 of 7
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    The effect of laser wavelength on the photorefractive characteristics of PMDA-DR19 based photorefractive polymeric materials
    (1997-09-01)
    Chang, CJ
    ;
    Wang, HC
    ;
    Liao, GY
    ;
    Whang, WT
    ;
    Liu, JM
    The photoconductivity and photorefractive characteristics of PMDA-DR19-based photoconducting nonlinear optical polymeric films with different compositions were studied using red and green lasers. Contributions of dopants and the host to the photoconductive and photorefractive properties are systematically discussed. The virgin nonlinear optical material PMDA-DR19 was neither photoconductive nor photorefractive in nature. However, it became photoconductive and photorefractive once the charge transport material was incorporated into the PMDA-DR19/PVB polymer film. Films containing more nonlinear optical chromophore exhibited higher diffraction efficiency. Response speed was further elevated when an additional charge generation material was doped in. Diffraction grating was observed under zero electric field and was confirmed due to a photorefractive effect by the two-beam coupling effect. In addition to composition modification, the laser light source was also an important factor in changing the PR response speed. The photorefractive response speed was tremendously improved when films were written and read by two different laser beams, either red/green lasers or green/red lasers. (C) 1997 Elsevier Science Ltd.
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    2k-grating-assisted self-pumped phase conjugation: Theoretical and experimental studies
    (1996-08-01)
    Lin, SUH
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    Lian, YW
    ;
    Yeh, PC
    ;
    Hsu, KY
    ;
    Yong, Z
    We investigated 2k-grating-assisted self-pumped phase conjugation in photorefractive Ce:BaTiO3 crystals. The phase-conjugation process involves a combination of four-wave mixing and stimulated photorefractive backscattering. An approximation involving separate interaction regions is used to theoretically calculate the reflectivity of phase conjugation as a function of the coupling strength of four-wave mixing and stimulated photorefractive backscattering. Fn our experiments, grating-erasure techniques are employed at the interaction regions to investigate the dependence of phase-conjugate reflectivity on the coupling strength of four-wave mixing and stimulated photorefractive backscattering. The experimental results are in good agreement with the theoretical prediction.
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    Creation of weighted volume grating by holographic method
    (2001)
    Zaitsev, AK
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    Lin, SH
    ;
    Hsu, KY
    ;
    交大名義發表
    ;
    National Chiao Tung University
    The creation method of a weighted holographic grating in photopolymer film is discussed, It is based on interference of two beams passed through weighting masks. Due to weighing the grating's response has sidelobe level to be reduced.
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    Photorefractive properties and applications of Ru-doped Bi12TiO20 single crystals
    (2001)
    Marinova, V
    ;
    Hsieh, ML
    ;
    Lin, SH
    ;
    Hsu, KY
    ;
    光電工程學系
    Bi12TiO20 single crystals doped with different concentrations of Ru were grown. Optical transmission spectra were measured. Photorefractive properties were experimentally investigated using two-beam coupling. Applications for optical information processing will be investigated.
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    Holographic memories for optical interconnections
    (2001)
    Hsu, KY
    ;
    Lin, SH
    ;
    光電工程學系
    ;
    Department of Photonics
    We present a reconfigurable optical interconnection using multiplexed holographic memories. The interconnection module consists of micro-mirrors and volume holograms. The design, analysis, and experimental results are presented.
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    Near infrared holographic recording in Ru-doped Bi12TiO20 single crystals
    (2003)
    Marinova, V
    ;
    Lin, SH
    ;
    Hsu, KY
    ;
    光電工程學系
    ;
    Department of Photonics
    Bi12TiO20 (BTO) single crystals doped with high concentration of ruthenium are grown by the Top Seeded Solution Growth Method. Ruthenium addition in BTO crystals shifts the optical absorption to the near IR spectral region in comparison with non-doped one. Measurements on light-induced near infrared absorption and temporal behavior of the dark decay are performed. Holographic gratings at 790 nm and 825 nm are recorded and dynamics of photorefractive index grating build-up and readout process are investigated.
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    Optical information processing by using anisotropic diffraction in BaTiO3
    (1997-11-01)
    Sun, CC
    ;
    Chang, MW
    ;
    Hsu, KY
    ;
    光電工程學系
    ;
    Department of Photonics
    In this paper, we review the effects and the applications of anisotropic diffraction in a normal-cut BaTiO3. We also report some new applications to optical digital logic operations and optical interconnections. In addition, we discuss two special features in a configuration where the crystal optic axis is normal to the incident plane: (1) the refractive index change can be as large as 2.7 x 10(-4); (2) the diffraction process is permitted when the polarizations of the probe beam and diffracted beam are mutually orthogonal, i.e. one is ordinary polarization and the other is extraordinary. These characteristics cause anisotropic self-diffraction and enable the crystal to record strong volume holograms. We present the applications of these characteristics to optical information processing, including matrix-matrix multiplication, contrast-reversible optical incoherent-to-coherent conversion and the potential applications to optical storage, optical digital logic operation and all-optical interconnection.