Pub Date : 2009-06-14DOI: 10.1109/CLEOE-EQEC.2009.5191626
R. Maldonado-Basilio, Sylwester Latkovsky, F. Surre, P. Landais
Passively mode-locked (PML) lasers have recently been investigated for pulse signal generation as they exhibit a periodic time variation of their output emission under continuous wave bias conditions. These devices allow a cost effective solution for pulse waveform signals generation at 40 GHz as they do not require any direct or external modulation. There are several types of configurations for edge emitting PML lasers. Among the most important are those based on gain-coupled distributed feedback (DFB) lasers [1], distributed Bragg reflector (DBR) lasers [2] and Fabry-Pérot (FP) cavities [3].
被动锁模(PML)激光器在连续波偏置条件下，其输出发射具有周期性的时间变化，近年来已被研究用于脉冲信号的产生。这些器件为40 GHz的脉冲波形信号生成提供了经济有效的解决方案，因为它们不需要任何直接或外部调制。有几种类型的配置边缘发射PML激光器。其中最重要的是基于增益耦合分布反馈(DFB)激光器[1]，分布式布拉格反射器(DBR)激光器[2]和fabry - p (FP)腔[3]的激光器。
{"title":"Linewidth study of 40-GHz passively mode-locked multimode semiconductor lasers","authors":"R. Maldonado-Basilio, Sylwester Latkovsky, F. Surre, P. Landais","doi":"10.1109/CLEOE-EQEC.2009.5191626","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5191626","url":null,"abstract":"Passively mode-locked (PML) lasers have recently been investigated for pulse signal generation as they exhibit a periodic time variation of their output emission under continuous wave bias conditions. These devices allow a cost effective solution for pulse waveform signals generation at 40 GHz as they do not require any direct or external modulation. There are several types of configurations for edge emitting PML lasers. Among the most important are those based on gain-coupled distributed feedback (DFB) lasers [1], distributed Bragg reflector (DBR) lasers [2] and Fabry-Pérot (FP) cavities [3].","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"188 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116402038","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 : 2009-06-14DOI: 10.1109/CLEOE-EQEC.2009.5192585
Hua Zhang, G. Scalari, R. Houdré, J. Faist
Photonic crystal (PhC) band engineering has been shown to be a method of choice to control the emitting properties of quantum cascade lasers (QCLs) [1,2] at THz frequency [3-6]. For PhC distribute-feedback (DFB) type lasers, the low group velocity is responsible for a significant gain enhancement, proportional to the group index [7]. The double plasmon waveguide, in which the TM polarized light is confined in the active region between two metallic layers, enables the fabrication of pillar structures possessing multiple complete photonic bandgaps (PBG) with very low intrinsic losses. In this work, we will present and discuss that pillar type PhC provides, along with spectral control of the light, lower losses, broader single mode tuneability and higher operating temperature than a state of the art fabricated FP cavity [3]. Accompanied with these in-plane emitting properties at 3 THz, we will show that the laser emission can be achieved in surface direction at 1.5 THz with PhC band structure engineering.
{"title":"In-plane and surface emitting high performance THz pillar type photonic crystal lasers with complete photonic bandgaps","authors":"Hua Zhang, G. Scalari, R. Houdré, J. Faist","doi":"10.1109/CLEOE-EQEC.2009.5192585","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5192585","url":null,"abstract":"Photonic crystal (PhC) band engineering has been shown to be a method of choice to control the emitting properties of quantum cascade lasers (QCLs) [1,2] at THz frequency [3-6]. For PhC distribute-feedback (DFB) type lasers, the low group velocity is responsible for a significant gain enhancement, proportional to the group index [7]. The double plasmon waveguide, in which the TM polarized light is confined in the active region between two metallic layers, enables the fabrication of pillar structures possessing multiple complete photonic bandgaps (PBG) with very low intrinsic losses. In this work, we will present and discuss that pillar type PhC provides, along with spectral control of the light, lower losses, broader single mode tuneability and higher operating temperature than a state of the art fabricated FP cavity [3]. Accompanied with these in-plane emitting properties at 3 THz, we will show that the laser emission can be achieved in surface direction at 1.5 THz with PhC band structure engineering.","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116405176","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 : 2009-06-14DOI: 10.1109/CLEOE-EQEC.2009.5192058
P. Merrer, A. Bouchier, H. Brahimi, Olivier Llopis, G. Cibiel
New resonators are investigated in order to design compact and high performances microwave oscillators. Because of long wavelengths in microwave range, dimensions of resonators are intrinsically large. Secondly, the quality factor of these resonators is now limited to about 2.105 at 10 GHz with whispering gallery modes (WGM) sapphire resonators. Nevertheless, it is possible to solve these difficulties if we use optical waves as a carrier for the RF frequencies, for example a 1.5 µm-laser. Resonators become optical ones, with low dimensions due to short wavelengths. The optical resonator creates an optical frequency comb with microwave spacing. Each mode of this comb is characterized by an optical Q factor (Qopt) and an equivalent RF Q factor (QRF). QRF is the product of Qopt and the RF to optical frequencies ratio. At 1.55 µm, this frequency ratio is about 104 at 20GHz and Qopt must be at least equal to 108 to obtain a quality at 20 GHz better than the microwave resonators. We present different high-Q optical resonators and an application of one of them to microwave photonics oscillators.
{"title":"High-Q optical resonators for laser stabilization in microwave photonics oscillators","authors":"P. Merrer, A. Bouchier, H. Brahimi, Olivier Llopis, G. Cibiel","doi":"10.1109/CLEOE-EQEC.2009.5192058","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5192058","url":null,"abstract":"New resonators are investigated in order to design compact and high performances microwave oscillators. Because of long wavelengths in microwave range, dimensions of resonators are intrinsically large. Secondly, the quality factor of these resonators is now limited to about 2.105 at 10 GHz with whispering gallery modes (WGM) sapphire resonators. Nevertheless, it is possible to solve these difficulties if we use optical waves as a carrier for the RF frequencies, for example a 1.5 µm-laser. Resonators become optical ones, with low dimensions due to short wavelengths. The optical resonator creates an optical frequency comb with microwave spacing. Each mode of this comb is characterized by an optical Q factor (Qopt) and an equivalent RF Q factor (QRF). QRF is the product of Qopt and the RF to optical frequencies ratio. At 1.55 µm, this frequency ratio is about 104 at 20GHz and Qopt must be at least equal to 108 to obtain a quality at 20 GHz better than the microwave resonators. We present different high-Q optical resonators and an application of one of them to microwave photonics oscillators.","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122365991","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 : 2009-06-14DOI: 10.1109/CLEOE-EQEC.2009.5191474
R. Dylewicz, R. Green, M. Sorel, A. C. Bryce, Richard M. De La Rue
We report on the spectral characterization of 1st order sidewall gratings with constant period of Λ = 236 nm, which were deeply etched into InP-based passive ridge waveguides. Periodic structures of this type with variable geometry (adjustable recess depth) may be used as the mirrors with well-controlled reflectivity for laser facets and intracavity reflectors, as well as in optical pulse compressors, when grating period chirp is imposed [1].
{"title":"Characterization of deeply etched uniform sidewall gratings in InP/InGaAsP ridge waveguides","authors":"R. Dylewicz, R. Green, M. Sorel, A. C. Bryce, Richard M. De La Rue","doi":"10.1109/CLEOE-EQEC.2009.5191474","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5191474","url":null,"abstract":"We report on the spectral characterization of 1st order sidewall gratings with constant period of Λ = 236 nm, which were deeply etched into InP-based passive ridge waveguides. Periodic structures of this type with variable geometry (adjustable recess depth) may be used as the mirrors with well-controlled reflectivity for laser facets and intracavity reflectors, as well as in optical pulse compressors, when grating period chirp is imposed [1].","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"360 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122782683","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 : 2009-06-14DOI: 10.1109/CLEOE-EQEC.2009.5192749
Wu Yuan, Lei Wei, O. Bang
Microstructured polymer optical fibres (mPOFs) have attracted significant interests, mainly because fabrication techniques have allowed novel structures to be made at low temperature with polymers, especially PMMA (refractive index 1.49) [1]. Recently, thermal and electrical tunabilities of liquid crystals infiltrated silica photonic bandgap fibres have been demonstrated, and various devices have also been developed [2, 3].
{"title":"Infiltration liquid crystal in microstructured polymer optical fibers","authors":"Wu Yuan, Lei Wei, O. Bang","doi":"10.1109/CLEOE-EQEC.2009.5192749","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5192749","url":null,"abstract":"Microstructured polymer optical fibres (mPOFs) have attracted significant interests, mainly because fabrication techniques have allowed novel structures to be made at low temperature with polymers, especially PMMA (refractive index 1.49) [1]. Recently, thermal and electrical tunabilities of liquid crystals infiltrated silica photonic bandgap fibres have been demonstrated, and various devices have also been developed [2, 3].","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122935486","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 : 2009-06-14DOI: 10.1109/CLEOE-EQEC.2009.5194799
K. Schenk, R. Peters, K. Petermann, G. Huber
Sesquioxides offer excellent thermal-mechanical properties. They have a high intrinsic thermal conductivity and good mechanical stability. Furthermore doping with rare earth ions in high concentration is possible because of the similar atomic radii. Especially ytterbium is an interesting active ion due to its very simple energy-level-scheme with only two multiplets. Therefore, no excited state absorbtion or upconversion processes should occur, making these materials well suited for use in lasers where high doping levels are necessary, especially for thin-disklasers. After demonstrating highly efficient laser operation of Yb:Lu2O3 and Yb:Sc2O3 thin-disk lasers [1,2], this work deals with the spectroscopic and scattering properties of Yb:Y2O3.
{"title":"Investigation of the scattering properties of Yb:Y2O3 and its effect on laser parameters","authors":"K. Schenk, R. Peters, K. Petermann, G. Huber","doi":"10.1109/CLEOE-EQEC.2009.5194799","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5194799","url":null,"abstract":"Sesquioxides offer excellent thermal-mechanical properties. They have a high intrinsic thermal conductivity and good mechanical stability. Furthermore doping with rare earth ions in high concentration is possible because of the similar atomic radii. Especially ytterbium is an interesting active ion due to its very simple energy-level-scheme with only two multiplets. Therefore, no excited state absorbtion or upconversion processes should occur, making these materials well suited for use in lasers where high doping levels are necessary, especially for thin-disklasers. After demonstrating highly efficient laser operation of Yb:Lu2O3 and Yb:Sc2O3 thin-disk lasers [1,2], this work deals with the spectroscopic and scattering properties of Yb:Y2O3.","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122484812","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 : 2009-06-14DOI: 10.1109/CLEOE-EQEC.2009.5196272
M. Yumoto, Y. Maeda, N. Saito, T. Ogawa, M. Yamashita, S. Wada
Tunable mid-infrared (IR) lasers attract significant interest for a number of advanced applications, for example, the structural analysis of biomolecules, such as protein and sugar chain, atmospheric remote sensing, the monitoring of poisonous gases and molecular treatment based on a molecule-structure change. In particular, a tunable mid-IR laser exhibiting high-speed wavelength tuning on the time scale from milliseconds to microseconds is expected to an important light source in molecular biology. To realize the above-mentioned applications, the tunable mid-IR laser requires wide-tuning-range and high-wavelength controllability to tune the mid-IR wavelengths to the absorption lines of molecules.
{"title":"Multi-wavelength rapid and random scanning for time-resolved mid-infrared laser spectroscopy","authors":"M. Yumoto, Y. Maeda, N. Saito, T. Ogawa, M. Yamashita, S. Wada","doi":"10.1109/CLEOE-EQEC.2009.5196272","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5196272","url":null,"abstract":"Tunable mid-infrared (IR) lasers attract significant interest for a number of advanced applications, for example, the structural analysis of biomolecules, such as protein and sugar chain, atmospheric remote sensing, the monitoring of poisonous gases and molecular treatment based on a molecule-structure change. In particular, a tunable mid-IR laser exhibiting high-speed wavelength tuning on the time scale from milliseconds to microseconds is expected to an important light source in molecular biology. To realize the above-mentioned applications, the tunable mid-IR laser requires wide-tuning-range and high-wavelength controllability to tune the mid-IR wavelengths to the absorption lines of molecules.","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"378 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122855972","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 : 2009-06-14DOI: 10.1109/CLEOE-EQEC.2009.5192464
T. Salger, S. Kling, T. Hecking, M. Weitz
We report on the successful experimental realization of a quantum ratchet for ultracold atoms in a driven spatially asymmetric optical lattice. Ratchets are usually considered as a tool, which rectify an otherwise undirected, for instance oscillating or fluctuating, motion of particles or objects. In order to observe a directed transport of atoms one has to break the space-time symmetry of the system [1–3]. Here, we report on the realization of a quantum ratchet in the absence of dissipative processes (Hamiltonian regime) within the interaction time.
{"title":"Directed transport of ultracold atoms in a Hamiltonian quantum ratchet","authors":"T. Salger, S. Kling, T. Hecking, M. Weitz","doi":"10.1109/CLEOE-EQEC.2009.5192464","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5192464","url":null,"abstract":"We report on the successful experimental realization of a quantum ratchet for ultracold atoms in a driven spatially asymmetric optical lattice. Ratchets are usually considered as a tool, which rectify an otherwise undirected, for instance oscillating or fluctuating, motion of particles or objects. In order to observe a directed transport of atoms one has to break the space-time symmetry of the system [1–3]. Here, we report on the realization of a quantum ratchet in the absence of dissipative processes (Hamiltonian regime) within the interaction time.","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122963922","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 : 2009-06-14DOI: 10.1109/CLEOE-EQEC.2009.5194552
N. Radwell, T. Ackemann, A. Scroggie, G. Oppo, W. Firth
Self-confinement of light and the control of light by light are both major thrusts of modern photonics. Recently, optically controllable microlasers were realized within the aperture of a broad-area vertical-cavity surface-emitting laser (VCSEL) with frequency selective feedback and interpreted as cavity solitons (CS), i.e. as spatially self-localized nonlinear states [1]. Like any free-running laser, a lasing CS has the freedom to choose polarization, phase and frequency, which gives exciting new opportunities for fundamental studies and applications. In particular this implies that the microlasers might operate on multiple longitudinal cavity modes leading to self-pulsing, if the modes are locked in phase. This is interesting in its own right but the intriguing long-term vision is that modelocked spatial laser solitons might lead to full three-dimensional confinement or spatio-temporal light bullets where the pulse length and duration are smaller that the cavity length and round-trip time, respectively.
{"title":"Transient and sustained mode-locking of cavity solitons in a VCSEL with frequency-selective feedback","authors":"N. Radwell, T. Ackemann, A. Scroggie, G. Oppo, W. Firth","doi":"10.1109/CLEOE-EQEC.2009.5194552","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5194552","url":null,"abstract":"Self-confinement of light and the control of light by light are both major thrusts of modern photonics. Recently, optically controllable microlasers were realized within the aperture of a broad-area vertical-cavity surface-emitting laser (VCSEL) with frequency selective feedback and interpreted as cavity solitons (CS), i.e. as spatially self-localized nonlinear states [1]. Like any free-running laser, a lasing CS has the freedom to choose polarization, phase and frequency, which gives exciting new opportunities for fundamental studies and applications. In particular this implies that the microlasers might operate on multiple longitudinal cavity modes leading to self-pulsing, if the modes are locked in phase. This is interesting in its own right but the intriguing long-term vision is that modelocked spatial laser solitons might lead to full three-dimensional confinement or spatio-temporal light bullets where the pulse length and duration are smaller that the cavity length and round-trip time, respectively.","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114472431","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 : 2009-06-14DOI: 10.1109/CLEOE-EQEC.2009.5196237
C. McKinstrie
Parametric devices based on four-wave mixing processes in fibers can amplify, frequency convert, phase conjugate, regenerate, sample and delay signals in conventional communication systems [1]. They can also generate [2] and frequency-convert [3] photons used in quantum-information experiments [4].
{"title":"Quantum theory and applications of fiber-based parametric devices","authors":"C. McKinstrie","doi":"10.1109/CLEOE-EQEC.2009.5196237","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5196237","url":null,"abstract":"Parametric devices based on four-wave mixing processes in fibers can amplify, frequency convert, phase conjugate, regenerate, sample and delay signals in conventional communication systems [1]. They can also generate [2] and frequency-convert [3] photons used in quantum-information experiments [4].","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"48 10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122152280","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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