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Holographic Fabrication of Periodic Microstructures in Dichromated Pullulan

100%
Savić-Šević S., Pantelić D., Gajić R., Isić G.
Acta Physica Polonica A
|
2007
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vol. 112
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issue 5
1079-1082
EN
Photonic crystal structures are fabricated in dichromated pullulan by the holographic technique. Relief structures of photonic lattices with rectangular, rhombic, and hexagonal arrays of peaks and holes are obtained. The structures have periodicities of the order 1.1μm and depth of about 50 nm.
2
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Aberrations of Betanin Sensitized Gelatin Microlenses

100%
Vasiljević D., Murić B., Pantelić D., Panić B.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
592-594
EN
Aberrations of the concave aspherical microlenses are presented. Microlenses are produced by using betanin sensitized gelatin and 532 nm laser irradiation (2nd Nd:YAG harmonic). Aberrations are analyzed by calculation of the longitudinal spherical aberration and the root mean square RMS spot radius. Three presented microlenses had good image quality for the large F number and the moderate field angle.
3
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Imaging Properties of Laser-Produced Parabolic Profile Microlenses

100%
Vasiljević D., Murić B., Pantelić D., Panić B.
Acta Physica Polonica A
|
2007
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vol. 112
|
issue 5
993-999
EN
Imaging properties of the concave microlens are presented. Microlenses are produced by using tot'hema eosin sensitized gelatin and 532 nm laser irradiation (2nd Nd:YAG harmonic). Imaging properties of microlenses are analized by calculation: the RMS wave front aberration, the diffraction point spread function cross section and the spot diagram. The obtained microlenses had excellent, near diffraction limited, performance for the moderate field angles.
4
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Holographic Measurement of Dental Tissue Contraction and Stress, due to Postpolymerization Reaction

76%
Pantelić D., Blažić L., Savić-Šević S., Murić B., Vasiljević D., Panić B., Belić I.
|
EN
Polymerization contraction of dental photo-polymer composites induces internal stress, in a tooth cavity. This stress is measured indirectly by, first, holographic determination of tooth deformation, with consequent calculation of stress using finite element method. Real time holographic technique enabled observation of dental deformation in all stages of polymerization. Specially constructed blue-LED light source was used to polymerize photopolymer composite. We have found that polymerization continues even after illumination is over. Consequently, stress is increased, too.
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