Digital holography can record fully complex-amplitude information in a Fourier-transformed hologram between a reference and multiple-target objects. Complex amplitude of a hologram can be measured by using six-step phase-shifting interferometry with a wavelength-tuned laser diode in a Mach-Zehnder interferometer. The six-step algorithm is inherently insensitive to a laser-diode power change associated with its current variation. The correlation signal is periodically repeated by the sampled digital hologram and high-order harmonics are mixed up with the peaks corresponding to other orders. The artifact false signals can be diminished when the objects are equally dispersedly placed those separations are equal to the number of multiple objects. The experimental results are shown.
{"title":"Multiple object recognition by digital holography with a wavelength-tuned laser diode","authors":"Y. Ishii, Takeshi Takahashi","doi":"10.1117/12.677165","DOIUrl":"https://doi.org/10.1117/12.677165","url":null,"abstract":"Digital holography can record fully complex-amplitude information in a Fourier-transformed hologram between a reference and multiple-target objects. Complex amplitude of a hologram can be measured by using six-step phase-shifting interferometry with a wavelength-tuned laser diode in a Mach-Zehnder interferometer. The six-step algorithm is inherently insensitive to a laser-diode power change associated with its current variation. The correlation signal is periodically repeated by the sampled digital hologram and high-order harmonics are mixed up with the peaks corresponding to other orders. The artifact false signals can be diminished when the objects are equally dispersedly placed those separations are equal to the number of multiple objects. The experimental results are shown.","PeriodicalId":266048,"journal":{"name":"International Conference on Holography, Optical Recording, and Processing of Information","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128675339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Bach, M. Jazbinšek, G. Montemezzani, P. Günter, A. Grabar, I. Stoika, Y. Vysochanskii
We investigate different types of ferroelectric photorefractive Sn2P2S6 at different wavelengths in the red and infrared. We show that modifying the growth conditions and doping with Te can efficiently improve the photorefractive properties of Sn2P2S6. Photorefractive two-beam coupling gain increases for Te-doped Sn2P2S6, up to 17 cm-1 at a wavelength of 633 nm and up to 7 cm-1 at 860 nm, compared to conventional "yellow" Sn2P2S6 which has a gain of 4-7 cm-1 at 633 nm and 2 cm-1 at 860 nm. We demonstrate self-pumped phase conjugation in ring cavity scheme at 780 nm for Te-doped Sn2P2S6 with a reflectivity of up to 30% in a relatively short rise time of less than 50 ms for 2 W/cm2 pump intensity.
{"title":"Enhanced near-infrared photorefractive properties of Te-doped Sn2P2S6","authors":"T. Bach, M. Jazbinšek, G. Montemezzani, P. Günter, A. Grabar, I. Stoika, Y. Vysochanskii","doi":"10.1117/12.676508","DOIUrl":"https://doi.org/10.1117/12.676508","url":null,"abstract":"We investigate different types of ferroelectric photorefractive Sn2P2S6 at different wavelengths in the red and infrared. We show that modifying the growth conditions and doping with Te can efficiently improve the photorefractive properties of Sn2P2S6. Photorefractive two-beam coupling gain increases for Te-doped Sn2P2S6, up to 17 cm-1 at a wavelength of 633 nm and up to 7 cm-1 at 860 nm, compared to conventional \"yellow\" Sn2P2S6 which has a gain of 4-7 cm-1 at 633 nm and 2 cm-1 at 860 nm. We demonstrate self-pumped phase conjugation in ring cavity scheme at 780 nm for Te-doped Sn2P2S6 with a reflectivity of up to 30% in a relatively short rise time of less than 50 ms for 2 W/cm2 pump intensity.","PeriodicalId":266048,"journal":{"name":"International Conference on Holography, Optical Recording, and Processing of Information","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128992637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
F. Juvalta, P. Dittrich, G. Montemezzani, M. Jazbinšek, P. Günter, S. Takekawa, K. Kitamura
Interband photorefractive gratings induced by deep ultraviolet light at λUV = 257 nm are investigated in pure and Mg-doped near-stoichiometric LiTaO3. By controlling the stoichiometry, the response time and dynamic range of the interband photorefractive effect can be very much improved. Measured time constants are in the order of a few tens of milliseconds for UV light intensities of about 100 mW/cm2. Further, we report that Mg doping of near-stoichiometric LiTaO3 increases the grating response rate by a factor of 50 compared with the one in undoped crystals. In Mg-doped near-stoichiometric LiTaO3, quasi-fixing of holographic gratings with UV light and nondestructive readout in the visible has been observed. These quasi-fixed gratings are written in the deep traps of the crystal.
{"title":"Holographic gratings in pure and Mg-doped near-stoichiometric LiTaO3 induced by deep-ultraviolet light","authors":"F. Juvalta, P. Dittrich, G. Montemezzani, M. Jazbinšek, P. Günter, S. Takekawa, K. Kitamura","doi":"10.1117/12.676517","DOIUrl":"https://doi.org/10.1117/12.676517","url":null,"abstract":"Interband photorefractive gratings induced by deep ultraviolet light at λUV = 257 nm are investigated in pure and Mg-doped near-stoichiometric LiTaO3. By controlling the stoichiometry, the response time and dynamic range of the interband photorefractive effect can be very much improved. Measured time constants are in the order of a few tens of milliseconds for UV light intensities of about 100 mW/cm2. Further, we report that Mg doping of near-stoichiometric LiTaO3 increases the grating response rate by a factor of 50 compared with the one in undoped crystals. In Mg-doped near-stoichiometric LiTaO3, quasi-fixing of holographic gratings with UV light and nondestructive readout in the visible has been observed. These quasi-fixed gratings are written in the deep traps of the crystal.","PeriodicalId":266048,"journal":{"name":"International Conference on Holography, Optical Recording, and Processing of Information","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130276133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A technique of imaging with a spatial coherence function, referred to as coherence holography, is proposed. A hologram of a three-dimensional object is recorded with coherent light in the same manner as in conventional holography, but the hologram is illuminated with spatially incoherent light to reconstruct the object as the three-dimensional distribution of a spatial coherence function, rather than as the amplitude or the intensity distribution of the optical field. A simple optical geometry for direct visualization of the reconstructed coherence image is proposed, and the results of preliminary experiments of a computer-generated coherence hologram (CGCH) are presented, which demonstrate the potential of CGCH as a means for optical coherence tomography and profilometry.
{"title":"Coherence holography: Holographic imaging with coherence function","authors":"M. Takeda, Wei Wang, Z. Duan, Y. Miyamoto","doi":"10.1117/12.677169","DOIUrl":"https://doi.org/10.1117/12.677169","url":null,"abstract":"A technique of imaging with a spatial coherence function, referred to as coherence holography, is proposed. A hologram of a three-dimensional object is recorded with coherent light in the same manner as in conventional holography, but the hologram is illuminated with spatially incoherent light to reconstruct the object as the three-dimensional distribution of a spatial coherence function, rather than as the amplitude or the intensity distribution of the optical field. A simple optical geometry for direct visualization of the reconstructed coherence image is proposed, and the results of preliminary experiments of a computer-generated coherence hologram (CGCH) are presented, which demonstrate the potential of CGCH as a means for optical coherence tomography and profilometry.","PeriodicalId":266048,"journal":{"name":"International Conference on Holography, Optical Recording, and Processing of Information","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131057963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Surface relief holograms are fabricated by means of irradiation of laser interference patterns. The diffraction efficiency and the surface relief depth depend on the writing energy and the polarization of the writing laser beam. The formation and erasure of photoinduced surface relief gratings (SRGs) on azobenzene-containing polymers are simulated using a numerical model based on the moving-particle semi-implicit (MPS) method. Particle motions in SRG formation and erasure are calculated and the SRG pitch and polarization dependences of the SRG growing and erasing rates are investigated. These theoretical results coincide qualitatively with our experimental results.
{"title":"Generation of surface relief hologram and nano structure on azobenzen polymer films and its numerical analysis by moving particle method","authors":"T. Yatagai, D. Barada, M. Itoh, K. Harada","doi":"10.1117/12.677017","DOIUrl":"https://doi.org/10.1117/12.677017","url":null,"abstract":"Surface relief holograms are fabricated by means of irradiation of laser interference patterns. The diffraction efficiency and the surface relief depth depend on the writing energy and the polarization of the writing laser beam. The formation and erasure of photoinduced surface relief gratings (SRGs) on azobenzene-containing polymers are simulated using a numerical model based on the moving-particle semi-implicit (MPS) method. Particle motions in SRG formation and erasure are calculated and the SRG pitch and polarization dependences of the SRG growing and erasing rates are investigated. These theoretical results coincide qualitatively with our experimental results.","PeriodicalId":266048,"journal":{"name":"International Conference on Holography, Optical Recording, and Processing of Information","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124284824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The subject today known as holography emerged from research in three diverse locations and having distinct origins, aims and methods: at a commercial electrical laboratory in Rugby, England, from the late 1940s until the mid 1950s; at the Vavilov State Optical Institute in Leningrad from the late 1950s and again from the mid 1960s; and, from a classified research laboratory operated by the University of Michigan beginning in the mid 1950s and accelerating from the early 1960s. The scientists, engineers, artisans, entrepreneurs and companies in that third location dominated the subject through the 1960s, making Ann Arbor, for a time, the 'holography capital of the world'. Based on extensive unpublished documents, artifacts and interviews with some two-dozen participants (much of it as yet unavailable in publicly accessible archives), this paper focuses on the origins of the subject in Ann Arbor, Michigan. It also explores how the initial explosion of interest was transmitted to other research groups, firms, artists and the wider public.
{"title":"Explosion with a slow-burning fuse: origins of holography in Ann Arbor, Michigan","authors":"S. Johnston","doi":"10.1117/12.676490","DOIUrl":"https://doi.org/10.1117/12.676490","url":null,"abstract":"The subject today known as holography emerged from research in three diverse locations and having distinct origins, aims and methods: at a commercial electrical laboratory in Rugby, England, from the late 1940s until the mid 1950s; at the Vavilov State Optical Institute in Leningrad from the late 1950s and again from the mid 1960s; and, from a classified research laboratory operated by the University of Michigan beginning in the mid 1950s and accelerating from the early 1960s. The scientists, engineers, artisans, entrepreneurs and companies in that third location dominated the subject through the 1960s, making Ann Arbor, for a time, the 'holography capital of the world'. Based on extensive unpublished documents, artifacts and interviews with some two-dozen participants (much of it as yet unavailable in publicly accessible archives), this paper focuses on the origins of the subject in Ann Arbor, Michigan. It also explores how the initial explosion of interest was transmitted to other research groups, firms, artists and the wider public.","PeriodicalId":266048,"journal":{"name":"International Conference on Holography, Optical Recording, and Processing of Information","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124385428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A Read-only Holographic Versatile Disc (HVD-ROM) system, using a laser diode for high capacity and high data transfer rates storage system, is proposed. With the collinear technologies' unique configuration the optical pickup can be designed as small as a DVD's, and can be placed on one side of the disc. With the HVD's special structure, the system can servo the focus/tracking and locate reading/writing address. The experiments and theoretical studies suggest that a laser diode is very suitable as a light source of our HVD-ROM system.
{"title":"Read-only holographic versatile disc system using laser diode","authors":"H. Horimai, X. Tan","doi":"10.1117/12.677020","DOIUrl":"https://doi.org/10.1117/12.677020","url":null,"abstract":"A Read-only Holographic Versatile Disc (HVD-ROM) system, using a laser diode for high capacity and high data transfer rates storage system, is proposed. With the collinear technologies' unique configuration the optical pickup can be designed as small as a DVD's, and can be placed on one side of the disc. With the HVD's special structure, the system can servo the focus/tracking and locate reading/writing address. The experiments and theoretical studies suggest that a laser diode is very suitable as a light source of our HVD-ROM system.","PeriodicalId":266048,"journal":{"name":"International Conference on Holography, Optical Recording, and Processing of Information","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124563410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A comparative investigation of the photochemical behavior of dichromated gelatin (DCG), dichromated polyacrylic acid (DCPAA) and dichromated polyvinylalcohol (DCPVA) gave evidence for the similarity of the photochemical behaviour involved when recording holograms in DCG and DCPVA. Chromium (V), the chromium species resulting from the photoredox process between the starting chromium (VI) (dichromate) and the polymeric chain, was stable likely strongly complexed in gelatine and polyvinylalcohol. The quantum yields of the reaction are high and similar for both reactions. On the contrary, even though chromium (V) was also formed during the primary process in DCPAA, this species was quite unstable and disappeared as soon as the irradiation was stopped. The behavior observed in DCG can be assigned to the presence of OH groups on the polymeric chain, these groups being the only groups present in polyvinylalcohol. Actually, the stability and the state of complexation of the different chromium species was completely opposite in the two matrices: the stabilization of chromium (V) resulting from the photochemical charge transfer in DCPVA, by complexation with PVA is in contrast to what was observed in DCPAA where chromium (V) was highly instable. Regarding chromium (III), the final reduction chromium species, it was complexed in PAA and not in PVA. The experiments performed on films of DC (PVA+PAA) with only a few percents of PAA gave evidence for the strong influence of the presence of the carboxylic groups on the photochemical behavior: the rate of the formation and the stability of chromium species that reflects the chelating properties of the polymeric matrix. The photochemical results were correlated to the results obtained when recording holograms in the corresponding material: a very nice agreement appeared between the two sets of results. An innovative approach combining the monitoring of the structural modification of the polymeric matrix and the fate of the various chromium species ((VI), (V) and (III)) was then implemented. For the first time, it was established that chromium (V) was at the origin of the cross-linking implied in the hologram formation by acting as a bridge between hydroxyl groups of the polymeric chains. A second unanswered question was also elucidated. The improvement brought by ammonium dichromate with respect to potassium dichromate involves amide groups as additional chelating sites for chromium (V) resulting in the increase of the matrix cross-linking.
{"title":"Interactivity holography/photochemistry: how the combined approach helps understand and optimise the holographic recording","authors":"M. Bolte, R. Lessard, Y. Israeli, A. Rivaton","doi":"10.1117/12.676495","DOIUrl":"https://doi.org/10.1117/12.676495","url":null,"abstract":"A comparative investigation of the photochemical behavior of dichromated gelatin (DCG), dichromated polyacrylic acid (DCPAA) and dichromated polyvinylalcohol (DCPVA) gave evidence for the similarity of the photochemical behaviour involved when recording holograms in DCG and DCPVA. Chromium (V), the chromium species resulting from the photoredox process between the starting chromium (VI) (dichromate) and the polymeric chain, was stable likely strongly complexed in gelatine and polyvinylalcohol. The quantum yields of the reaction are high and similar for both reactions. On the contrary, even though chromium (V) was also formed during the primary process in DCPAA, this species was quite unstable and disappeared as soon as the irradiation was stopped. The behavior observed in DCG can be assigned to the presence of OH groups on the polymeric chain, these groups being the only groups present in polyvinylalcohol. Actually, the stability and the state of complexation of the different chromium species was completely opposite in the two matrices: the stabilization of chromium (V) resulting from the photochemical charge transfer in DCPVA, by complexation with PVA is in contrast to what was observed in DCPAA where chromium (V) was highly instable. Regarding chromium (III), the final reduction chromium species, it was complexed in PAA and not in PVA. The experiments performed on films of DC (PVA+PAA) with only a few percents of PAA gave evidence for the strong influence of the presence of the carboxylic groups on the photochemical behavior: the rate of the formation and the stability of chromium species that reflects the chelating properties of the polymeric matrix. The photochemical results were correlated to the results obtained when recording holograms in the corresponding material: a very nice agreement appeared between the two sets of results. An innovative approach combining the monitoring of the structural modification of the polymeric matrix and the fate of the various chromium species ((VI), (V) and (III)) was then implemented. For the first time, it was established that chromium (V) was at the origin of the cross-linking implied in the hologram formation by acting as a bridge between hydroxyl groups of the polymeric chains. A second unanswered question was also elucidated. The improvement brought by ammonium dichromate with respect to potassium dichromate involves amide groups as additional chelating sites for chromium (V) resulting in the increase of the matrix cross-linking.","PeriodicalId":266048,"journal":{"name":"International Conference on Holography, Optical Recording, and Processing of Information","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123438775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
O. Andreeva, L. N. Kaporskiy, A. P. Kushnarenko, A. Paramonov
A broadband laser-based technique for investigation the parameters of spectral selectivity high-selective volume hologram is suggested. The studies, carried out by this method, were realized with using radiation of femtosecond and semiconductor lasers. The transmission phase holographic gratings recorded on polymer recording media samples of 1-2 mm thickness were used. The results of investigations of spectral selectivity of transmission phase holographic gratings of various frequencies are presented. The verification of obtained results was fulfilled. The limits of technique validity were estimated.
{"title":"Spectral selectivity investigation of volume holograms by means of laser radiation","authors":"O. Andreeva, L. N. Kaporskiy, A. P. Kushnarenko, A. Paramonov","doi":"10.1117/12.677290","DOIUrl":"https://doi.org/10.1117/12.677290","url":null,"abstract":"A broadband laser-based technique for investigation the parameters of spectral selectivity high-selective volume hologram is suggested. The studies, carried out by this method, were realized with using radiation of femtosecond and semiconductor lasers. The transmission phase holographic gratings recorded on polymer recording media samples of 1-2 mm thickness were used. The results of investigations of spectral selectivity of transmission phase holographic gratings of various frequencies are presented. The verification of obtained results was fulfilled. The limits of technique validity were estimated.","PeriodicalId":266048,"journal":{"name":"International Conference on Holography, Optical Recording, and Processing of Information","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124956403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
G. Gudaitis, Stanislovas J. Zacharovas, D. Ratcliffe, Jurij A. Sazonov
A review of the high-resolution VRP Silver Halide photo-materials (available through the Geola international distribution network) is presented. In addition to traditional holographic applications, the behaviour of current VRP materials is discussed in relation to embossed mastering origination, masks for microelectronics and X-ray tomography. Properties and applications of the fine grain, blue-green sensitive VRP plates are compared with previously available materials from other manufacturers. Recommended chemistries that may be employed with the VRP emulsion in different applications are reviewed.
{"title":"New applications of silver halide photo-materials","authors":"G. Gudaitis, Stanislovas J. Zacharovas, D. Ratcliffe, Jurij A. Sazonov","doi":"10.1117/12.676941","DOIUrl":"https://doi.org/10.1117/12.676941","url":null,"abstract":"A review of the high-resolution VRP Silver Halide photo-materials (available through the Geola international distribution network) is presented. In addition to traditional holographic applications, the behaviour of current VRP materials is discussed in relation to embossed mastering origination, masks for microelectronics and X-ray tomography. Properties and applications of the fine grain, blue-green sensitive VRP plates are compared with previously available materials from other manufacturers. Recommended chemistries that may be employed with the VRP emulsion in different applications are reviewed.","PeriodicalId":266048,"journal":{"name":"International Conference on Holography, Optical Recording, and Processing of Information","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129136539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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