We present an innovative design for a two-head,gas-cooled multi-slab high-energy,high-repetition-rate amplifier aimed at mitigating thermally induced depolarization in a wide-bandwidth neodymium-doped glass gain mediu...We present an innovative design for a two-head,gas-cooled multi-slab high-energy,high-repetition-rate amplifier aimed at mitigating thermally induced depolarization in a wide-bandwidth neodymium-doped glass gain medium.This architecture employs two quartz rotators(QRs)with opposite-handedness,strategically positioned within each multi-slab amplifier head,to enhance depolarization compensation.Theoretical modeling of this amplifier configuration demonstrates a 20×reduction in depolarization losses for a 70 mm beam operating at the central wavelength,compared to conventional approaches that utilize a single QR positioned between the amplifier heads.In addition,for a wide bandwidth source,the integration of QRs with opposite-handedness yields a 9×improvement in depolarization losses at the spectral extremes compared to the use of two QRs exhibiting the same optical handedness in both amplifier heads.展开更多
Integrated photonics offers the possibility of compact,low energy,bandwidth-dense interconnects for large port count spatial optical switches,facilitating flexible and energy efficient data movement in future data com...Integrated photonics offers the possibility of compact,low energy,bandwidth-dense interconnects for large port count spatial optical switches,facilitating flexible and energy efficient data movement in future data communications systems.To achieve widespread adoption,intimate integration with electronics has to be possible,requiring switch design using standard microelectronic foundry processes and available devices.We report on the feasibility of a switch fabric comprised of ubiquitous silicon photonic building blocks,opening the possibility to combine technologies,and materials towards a new path for switch fabric design.Rather than focus on integrating all devices on a single silicon chip die to achieve large port count optical switching,this work shifts the focus towards innovative packaging and integration schemes.In this work,we demonstrate 1×8 and 8×1 microring-based silicon photonic switch building blocks with software control,providing the feasibility of a full 8×8 architecture composed of silicon photonic building blocks.The proposed switch is fully non-blocking,has path-independent insertion loss,low crosstalk,and is straightforward to control.We further analyze this architecture and compare it with other common switching architectures for varying underlying technologies and radices,showing that the proposed architecture favorably scales to very large port counts when considering both crosstalk and architectural footprint.Separating a switch fabric into functional building blocks via multiple photonic integrated circuits offers the advantage of piece-wise manufacturing,packaging,and assembly,potentially reducing the number of optical I/O and electrical contacts on a single die.展开更多
As mask features scale to smaller dimensions, the so-called ＂3-D mask effects＂ which have mostly been neglected before, become important. This paper properly models the 3-D thick mask effects, and then analyses the ...As mask features scale to smaller dimensions, the so-called ＂3-D mask effects＂ which have mostly been neglected before, become important. This paper properly models the 3-D thick mask effects, and then analyses the object-based inverse lithography technique using a simulated annealing algorithm to determine the mask shapes that produce the desired on-wafer results. Evaluations against rigorous simulations show that the synthesized masks provide good image fidelity up to 0.94, and this approach gives improved accuracy and faster results than existing methods.展开更多
Nanocomposites built from polymers and carbon nanotubes(CNTs)are a promising class of materials.Computer modeling can provide nanoscale views of the polymer–CNT interface,which are much needed to foster the manufactu...Nanocomposites built from polymers and carbon nanotubes(CNTs)are a promising class of materials.Computer modeling can provide nanoscale views of the polymer–CNT interface,which are much needed to foster the manufacturing and development of such materials.However,setting up periodic nanocomposite models is a challenging task.Here we propose a computational workflow based on Molecular Dynamics simulations.展开更多
基金the auspices of the U.S.Department of Energy by Lawrance Livermore National Laboratory under Contract DE-AC52-07NA27344funding provided by the Department of Energy Office of Fusion Energy Sciences.LLNL-JRNL-869299。
文摘We present an innovative design for a two-head,gas-cooled multi-slab high-energy,high-repetition-rate amplifier aimed at mitigating thermally induced depolarization in a wide-bandwidth neodymium-doped glass gain medium.This architecture employs two quartz rotators(QRs)with opposite-handedness,strategically positioned within each multi-slab amplifier head,to enhance depolarization compensation.Theoretical modeling of this amplifier configuration demonstrates a 20×reduction in depolarization losses for a 70 mm beam operating at the central wavelength,compared to conventional approaches that utilize a single QR positioned between the amplifier heads.In addition,for a wide bandwidth source,the integration of QRs with opposite-handedness yields a 9×improvement in depolarization losses at the spectral extremes compared to the use of two QRs exhibiting the same optical handedness in both amplifier heads.
基金The work of David M Calhoun is supported in part by the Columbia University Optics and Quantum Electronics IGERT under NSF IGERT(DGE-1069240)We thank Gernot Pomrenke,of AFOSR,for his support of the OpSIS effort,through the PECASE award(FA9550-13-1-0027)+2 种基金subcontract 39344 Multi-Terabit-Capable Silicon Photonic Interconnected End-to-End System under DURIP(FA9550-14-1-0198)ongoing funding for OpSIS(FA9550-10-1-0439)This work was further supported in part by the AFOSR Small Business Technology Transfer under Grant FA9550-12-C-0079 and by Portage Bay Photonics.
文摘Integrated photonics offers the possibility of compact,low energy,bandwidth-dense interconnects for large port count spatial optical switches,facilitating flexible and energy efficient data movement in future data communications systems.To achieve widespread adoption,intimate integration with electronics has to be possible,requiring switch design using standard microelectronic foundry processes and available devices.We report on the feasibility of a switch fabric comprised of ubiquitous silicon photonic building blocks,opening the possibility to combine technologies,and materials towards a new path for switch fabric design.Rather than focus on integrating all devices on a single silicon chip die to achieve large port count optical switching,this work shifts the focus towards innovative packaging and integration schemes.In this work,we demonstrate 1×8 and 8×1 microring-based silicon photonic switch building blocks with software control,providing the feasibility of a full 8×8 architecture composed of silicon photonic building blocks.The proposed switch is fully non-blocking,has path-independent insertion loss,low crosstalk,and is straightforward to control.We further analyze this architecture and compare it with other common switching architectures for varying underlying technologies and radices,showing that the proposed architecture favorably scales to very large port counts when considering both crosstalk and architectural footprint.Separating a switch fabric into functional building blocks via multiple photonic integrated circuits offers the advantage of piece-wise manufacturing,packaging,and assembly,potentially reducing the number of optical I/O and electrical contacts on a single die.
基金Supported by the National Key Basic Research and Development(973) Program of China (No. 2006CB302700)the Basic Research Foundation of Tsinghua National Laboratory for Information Science and Technology (TNList)
文摘As mask features scale to smaller dimensions, the so-called ＂3-D mask effects＂ which have mostly been neglected before, become important. This paper properly models the 3-D thick mask effects, and then analyses the object-based inverse lithography technique using a simulated annealing algorithm to determine the mask shapes that produce the desired on-wafer results. Evaluations against rigorous simulations show that the synthesized masks provide good image fidelity up to 0.94, and this approach gives improved accuracy and faster results than existing methods.
基金We also thank the PRACE committee for granting us supercomputer time at High Performance Computing Center Stuttgart in Hermit/Hornet supercomputers(project PP14102332)E.R.C.C.acknowledges additional support from the Fundacion Cristina e Ismael Cobian through Beca de RetornoN.M.P.is supported by the European Commision under the Graphene Fragship Core 3 grant No.881603(WP12,"Composites").
文摘Nanocomposites built from polymers and carbon nanotubes(CNTs)are a promising class of materials.Computer modeling can provide nanoscale views of the polymer–CNT interface,which are much needed to foster the manufacturing and development of such materials.However,setting up periodic nanocomposite models is a challenging task.Here we propose a computational workflow based on Molecular Dynamics simulations.
