Pub Date : 2011-05-22DOI: 10.1109/CLEOE.2011.5943393
C. Schwemmer, G. Tóth, W. Wieczorek, D. Gross, R. Krischek, H. Weinfurter
Multi-partite entangled quantum states play an important role in quantum information processing with applications, for example, in quantum enhanced metrology or quantum communication. Therefore, efficient measurement schemes to fully characterize these states are needed. However, conventional quantum state tomography which reveals all properties of a quantum state suffers from an exponentially increasing measurement effort with the number of qubits.
{"title":"Permutationally invariant tomography of a four-qubit symmetric Dicke state","authors":"C. Schwemmer, G. Tóth, W. Wieczorek, D. Gross, R. Krischek, H. Weinfurter","doi":"10.1109/CLEOE.2011.5943393","DOIUrl":"https://doi.org/10.1109/CLEOE.2011.5943393","url":null,"abstract":"Multi-partite entangled quantum states play an important role in quantum information processing with applications, for example, in quantum enhanced metrology or quantum communication. Therefore, efficient measurement schemes to fully characterize these states are needed. However, conventional quantum state tomography which reveals all properties of a quantum state suffers from an exponentially increasing measurement effort with the number of qubits.","PeriodicalId":6331,"journal":{"name":"2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)","volume":"26 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2011-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81147032","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}
Pub Date : 2011-05-22DOI: 10.1109/CLEOE.2011.5942639
R. Green, M. Haji, L. Hou, G. Mezősi, R. Dylewicz, T. Kelly
In recent years there has been a high level of interest in the properties of fast semiconductor saturable absorbers operating at λ ∼ 1.5»m. The applications for these include the fabrication of passively modelocked lasers[1] and wavelength conversion of optical data streams through cross-absorption modulation. To enable these effects to be utilised at the highest repetition rates, very fast absorption recovery times are required, in materials that can be conveniently integrated with optical gain elements. Several methods for achieving very short absorption recovery times have been demonstrated such as the inclusion of high densities of crystal defects in the material and the use of intersubband transitions. However, it is not possible to integrate these with gain elements operating at the same wavelength without the use of expensive and technologically demanding epitaxial regrowth processes.
{"title":"Fast absorption recovery and wavelength conversion in 1.5mm AlInGaAs MQW lasers","authors":"R. Green, M. Haji, L. Hou, G. Mezősi, R. Dylewicz, T. Kelly","doi":"10.1109/CLEOE.2011.5942639","DOIUrl":"https://doi.org/10.1109/CLEOE.2011.5942639","url":null,"abstract":"In recent years there has been a high level of interest in the properties of fast semiconductor saturable absorbers operating at λ ∼ 1.5»m. The applications for these include the fabrication of passively modelocked lasers[1] and wavelength conversion of optical data streams through cross-absorption modulation. To enable these effects to be utilised at the highest repetition rates, very fast absorption recovery times are required, in materials that can be conveniently integrated with optical gain elements. Several methods for achieving very short absorption recovery times have been demonstrated such as the inclusion of high densities of crystal defects in the material and the use of intersubband transitions. However, it is not possible to integrate these with gain elements operating at the same wavelength without the use of expensive and technologically demanding epitaxial regrowth processes.","PeriodicalId":6331,"journal":{"name":"2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)","volume":"21 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2011-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85422802","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}
Pub Date : 2011-05-22DOI: 10.1109/CLEOE.2011.5943676
R. Thomson, T. Birks, S. Leon-Saval, A. Kar, J. Bland-Hawthorn
Astrophotonics is the application of photonic principles to astronomical instrumentation, in order to reduce cost, size, weight and complexity while increasing performance. In astrophotonics the “photonic lantern” (PL) [1–4] is a remarkable photonic device which efficiently couples light between a multimode (MM) optical fibre and a set of degenerate single modes (SMs) which are guided by the cores of either individual SM fibres [1–3] or a multicore optical fibre [4]. If the SMs produced by the PL are arranged into a linear array [5], the PL facilitates the efficient collection of light from a telescope using a MM fibre and the low-loss reformatting of this light into a near diffraction limited input (in one axis) for a spectrometer [6].
{"title":"Ultrafast laser inscription of an integrated multimode-to-single-modes waveguide transition for astrophotonics","authors":"R. Thomson, T. Birks, S. Leon-Saval, A. Kar, J. Bland-Hawthorn","doi":"10.1109/CLEOE.2011.5943676","DOIUrl":"https://doi.org/10.1109/CLEOE.2011.5943676","url":null,"abstract":"Astrophotonics is the application of photonic principles to astronomical instrumentation, in order to reduce cost, size, weight and complexity while increasing performance. In astrophotonics the “photonic lantern” (PL) [1–4] is a remarkable photonic device which efficiently couples light between a multimode (MM) optical fibre and a set of degenerate single modes (SMs) which are guided by the cores of either individual SM fibres [1–3] or a multicore optical fibre [4]. If the SMs produced by the PL are arranged into a linear array [5], the PL facilitates the efficient collection of light from a telescope using a MM fibre and the low-loss reformatting of this light into a near diffraction limited input (in one axis) for a spectrometer [6].","PeriodicalId":6331,"journal":{"name":"2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)","volume":"41 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2011-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85831566","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}
Pub Date : 2011-05-22DOI: 10.1109/CLEOE.2011.5942746
W. Chang, A. Nazarkin, J. Travers, P. Holzer, J. Nold, N. Y. Joly, P. Russell
Hollow-core photonic-crystal fibre (HC-PCF) [1] provides a highly efficient means for investigating light-matter interactions at sustained intensity levels inaccessible to both traditional bulk setups (due to limited interaction lengths) or conventional optical fibres (due to the low damage threshold of glass). Recent experiments have shown that strong UV pulses can be generated, through emission of dispersive radiation, by launching near-IR femtosecond pulses into a gas-filled kagomé-lattice PCF [2]. Phase-matching to the UV can be accounted for through the special dispersion characteristics of the gas-filled HC-PCF [3]. Shorter UV wavelengths require higher energy pulses, causing the intensity to enter the ionisation regime when pulse propagation will be influenced by the presence of free electrons. The transition from the “traditional” regime where the Kerr effect dominates to the plasma regime where ionisation becomes important (novel in the context of photonic crystal fibres) is studied numerically in this work.
{"title":"Theoretical study of dispersive wave generation in ar-filled hollow-core PCF above the plasma threshold","authors":"W. Chang, A. Nazarkin, J. Travers, P. Holzer, J. Nold, N. Y. Joly, P. Russell","doi":"10.1109/CLEOE.2011.5942746","DOIUrl":"https://doi.org/10.1109/CLEOE.2011.5942746","url":null,"abstract":"Hollow-core photonic-crystal fibre (HC-PCF) [1] provides a highly efficient means for investigating light-matter interactions at sustained intensity levels inaccessible to both traditional bulk setups (due to limited interaction lengths) or conventional optical fibres (due to the low damage threshold of glass). Recent experiments have shown that strong UV pulses can be generated, through emission of dispersive radiation, by launching near-IR femtosecond pulses into a gas-filled kagomé-lattice PCF [2]. Phase-matching to the UV can be accounted for through the special dispersion characteristics of the gas-filled HC-PCF [3]. Shorter UV wavelengths require higher energy pulses, causing the intensity to enter the ionisation regime when pulse propagation will be influenced by the presence of free electrons. The transition from the “traditional” regime where the Kerr effect dominates to the plasma regime where ionisation becomes important (novel in the context of photonic crystal fibres) is studied numerically in this work.","PeriodicalId":6331,"journal":{"name":"2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)","volume":"93 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2011-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84091909","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}
Pub Date : 2011-05-22DOI: 10.1109/CLEOE.2011.5942532
O. Collett, C. Bollig, M. Esser
Single frequency 2µm sources are useful in varied applications including remote sensing, spectroscopy and nonlinear conversion to the mid-infrared. However, to generate high energy pulses from a 2 µm oscillator is challenging, which is typically overcome by implementing a master oscillator power amplifier approach [1]. We have previously demonstrated a single frequency Ho:YLF laser which produced up to 70 mJ per pulse [2] at 2064nm and subsequently developed a 200W Tm:YLF slab laser to be used as pump source for a power amplifier.
{"title":"Numerical optimisation of a high-energy end-pumped Ho:YLF slab amplifier","authors":"O. Collett, C. Bollig, M. Esser","doi":"10.1109/CLEOE.2011.5942532","DOIUrl":"https://doi.org/10.1109/CLEOE.2011.5942532","url":null,"abstract":"Single frequency 2µm sources are useful in varied applications including remote sensing, spectroscopy and nonlinear conversion to the mid-infrared. However, to generate high energy pulses from a 2 µm oscillator is challenging, which is typically overcome by implementing a master oscillator power amplifier approach [1]. We have previously demonstrated a single frequency Ho:YLF laser which produced up to 70 mJ per pulse [2] at 2064nm and subsequently developed a 200W Tm:YLF slab laser to be used as pump source for a power amplifier.","PeriodicalId":6331,"journal":{"name":"2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)","volume":"12 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2011-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78266014","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}
Pub Date : 2011-05-22DOI: 10.1109/CLEOE.2011.5943161
E. G. van Putten, D. Akbulut, J. Bertolotti, A. Lagendijk, A. Mosk
Scattering of light is usually seen as a nuisance in microscopy. Scattering limits the penetration depth and strongly deteriorates the achievable resolution. However, by gaining active spatial control over the optical wave front it is possible to manipulate the propagation of scattered light even far in the multiple scattering regime.[1–3] It was recently shown that in this way scattered light can even be exploited for perfect optical focussing.[4] These wave front shaping techniques pave the way for new microscopy methods based on strong light scattering.[5–8]
{"title":"Coherent optical imaging through opaque layers","authors":"E. G. van Putten, D. Akbulut, J. Bertolotti, A. Lagendijk, A. Mosk","doi":"10.1109/CLEOE.2011.5943161","DOIUrl":"https://doi.org/10.1109/CLEOE.2011.5943161","url":null,"abstract":"Scattering of light is usually seen as a nuisance in microscopy. Scattering limits the penetration depth and strongly deteriorates the achievable resolution. However, by gaining active spatial control over the optical wave front it is possible to manipulate the propagation of scattered light even far in the multiple scattering regime.[1–3] It was recently shown that in this way scattered light can even be exploited for perfect optical focussing.[4] These wave front shaping techniques pave the way for new microscopy methods based on strong light scattering.[5–8]","PeriodicalId":6331,"journal":{"name":"2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)","volume":"29 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2011-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78158594","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}
Pub Date : 2011-05-22DOI: 10.1109/CLEOE.2011.5942748
S. Sørensen, A. Judge, C. Thomsen, O. Bang
Tapering has been demonstrated as an effective way of pushing the short-wavelength edge of a supercontinuum (SC) into the deep-blue [1–2]. The spectrum of an SC is comprised by a soliton red-edge linked to a dispersive wave (DW) blue-edge through group-velocity matching (GVM) [3]. The edges are formed when a red-shifting soliton catches up with a DW, allowing them to interact through cross-phase modulation (XPM). Tapering utilises this and allows GVM to shorter wavelength. So far the focus has been on moving the spectral edge, only little attention has been devoted to maximising the power in the blue-edge. Here we demonstrate by numerical simulations that the gradient of the taper has a major impact on the power actually available in the blue-edge.
{"title":"Group-acceleration matching in tapered optical fibers for maximising the power in the blue-edge of a supercontinuum","authors":"S. Sørensen, A. Judge, C. Thomsen, O. Bang","doi":"10.1109/CLEOE.2011.5942748","DOIUrl":"https://doi.org/10.1109/CLEOE.2011.5942748","url":null,"abstract":"Tapering has been demonstrated as an effective way of pushing the short-wavelength edge of a supercontinuum (SC) into the deep-blue [1–2]. The spectrum of an SC is comprised by a soliton red-edge linked to a dispersive wave (DW) blue-edge through group-velocity matching (GVM) [3]. The edges are formed when a red-shifting soliton catches up with a DW, allowing them to interact through cross-phase modulation (XPM). Tapering utilises this and allows GVM to shorter wavelength. So far the focus has been on moving the spectral edge, only little attention has been devoted to maximising the power in the blue-edge. Here we demonstrate by numerical simulations that the gradient of the taper has a major impact on the power actually available in the blue-edge.","PeriodicalId":6331,"journal":{"name":"2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)","volume":"224 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2011-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72819833","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}
Pub Date : 2011-05-22DOI: 10.1109/CLEOE.2011.5942496
S. Ricaud, D. Papadopoulos, P. Camy, J. Doualan, R. Moncorgé, A. Courjaud, E. Mottay, P. Georges, F. Druon
Since its first laser operation in 2004 [1], Yb:CaF2 has been one of the most studied and promising crystals in the realm of Yb-doped materials for DPSSL applications [2,3]. In fact, this crystal gathers several interesting advantages for the development of high-power diode-pumped lasers, among which an excellent thermal conductivity of 9.3 W/m/K[4], comparable to YAG, a broad emission band, extending from about 1010 and 1070 nm and a long emission lifetime of 2.3 ms. And, the last but not the least advantage over its competitors concerns the fact that the crystal growth of pure CaF2 is already well mastered and that ultra-high-quality and very large crystals of Yb:CaF2 could be produced in the near future.
{"title":"Yb:CaF2 laser at cryogenic temperature","authors":"S. Ricaud, D. Papadopoulos, P. Camy, J. Doualan, R. Moncorgé, A. Courjaud, E. Mottay, P. Georges, F. Druon","doi":"10.1109/CLEOE.2011.5942496","DOIUrl":"https://doi.org/10.1109/CLEOE.2011.5942496","url":null,"abstract":"Since its first laser operation in 2004 [1], Yb:CaF2 has been one of the most studied and promising crystals in the realm of Yb-doped materials for DPSSL applications [2,3]. In fact, this crystal gathers several interesting advantages for the development of high-power diode-pumped lasers, among which an excellent thermal conductivity of 9.3 W/m/K[4], comparable to YAG, a broad emission band, extending from about 1010 and 1070 nm and a long emission lifetime of 2.3 ms. And, the last but not the least advantage over its competitors concerns the fact that the crystal growth of pure CaF2 is already well mastered and that ultra-high-quality and very large crystals of Yb:CaF2 could be produced in the near future.","PeriodicalId":6331,"journal":{"name":"2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)","volume":"71 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2011-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72921242","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}
Pub Date : 2011-05-22DOI: 10.1109/CLEOE.2011.5942738
F. Çivitci, A. Driessen, H. Hoekstra
An efficient connection of integrated optical components and photo-detectors (PDs) is very important to realize small size and high functionality optoelectronic devices. A number of techniques have been reported to provide such a connection. One of these uses a focusing grating coupler on top of a waveguide (WG) to focus the light to the PD above the WG [1]. However, high volume production of such devices is not possible because no mask can be used to define the grating, owing to its relatively small period. Another technique uses a focused ion beam to mill total internal reflection (TIR) mirrors, but this technique is also not suitable for high volume production [2]. The third technique is based on a metal mirror, at which the desired mirror angle is fabricated by using a superficial layer in the wet etching process [3]. The efficiency of the mirrors is very high, but the thermal budget of the fabrication process is low because the melting temperature of metal layer used in the mirror is low.
{"title":"Light turning mirrors for hybrid integration of optical waveguides in SiON technology and CMOS based photo-detectors","authors":"F. Çivitci, A. Driessen, H. Hoekstra","doi":"10.1109/CLEOE.2011.5942738","DOIUrl":"https://doi.org/10.1109/CLEOE.2011.5942738","url":null,"abstract":"An efficient connection of integrated optical components and photo-detectors (PDs) is very important to realize small size and high functionality optoelectronic devices. A number of techniques have been reported to provide such a connection. One of these uses a focusing grating coupler on top of a waveguide (WG) to focus the light to the PD above the WG [1]. However, high volume production of such devices is not possible because no mask can be used to define the grating, owing to its relatively small period. Another technique uses a focused ion beam to mill total internal reflection (TIR) mirrors, but this technique is also not suitable for high volume production [2]. The third technique is based on a metal mirror, at which the desired mirror angle is fabricated by using a superficial layer in the wet etching process [3]. The efficiency of the mirrors is very high, but the thermal budget of the fabrication process is low because the melting temperature of metal layer used in the mirror is low.","PeriodicalId":6331,"journal":{"name":"2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)","volume":"23 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2011-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73169845","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}
Pub Date : 2011-05-22DOI: 10.1109/CLEOE.2011.5943670
J. Allington-Smith
Astrophotonics offers the means to answer some of the most outstanding questions in astronomy by improving the versatility - and therefore the scientific productivity - of highly-multiplexed and precision spectroscopic systems. Together with the increased collecting aperture of the next generation of telescopes and wide-field Adaptive Optics, large, high-precision surveys of faint objects, selected primarily by mass content rather than luminous output, will be possible. Tight control over the instrument characteristics will also permit recovery of the most subtle spectral features. This requires the imaginative use of photonic devices and principles.
{"title":"Answering the big questions in astronomy with astrophotonic spectroscopy","authors":"J. Allington-Smith","doi":"10.1109/CLEOE.2011.5943670","DOIUrl":"https://doi.org/10.1109/CLEOE.2011.5943670","url":null,"abstract":"Astrophotonics offers the means to answer some of the most outstanding questions in astronomy by improving the versatility - and therefore the scientific productivity - of highly-multiplexed and precision spectroscopic systems. Together with the increased collecting aperture of the next generation of telescopes and wide-field Adaptive Optics, large, high-precision surveys of faint objects, selected primarily by mass content rather than luminous output, will be possible. Tight control over the instrument characteristics will also permit recovery of the most subtle spectral features. This requires the imaginative use of photonic devices and principles.","PeriodicalId":6331,"journal":{"name":"2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)","volume":"29 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2011-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73285107","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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