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arXiv 2017年

作者： Ravi, Koustuban Kartner, Franz X. Research Laboratory of Electronics and the Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Center for Free-Electron Laser Science Desy Notkestraffe 85 Hamburg22607 Research Laboratory of Electronics Massachusetts Institute of Technology Department of Physics University of Hamburg Hamburg22761

We introduce a technique to generate compressed broadband terahertz pulses based on the cascaded difference frequency generation of a non-uniform sequence of pump pulses in aperiodically poled structures. The pump pulse format and poling of crystals conceived are such that the emergent terahertz pulse is already compressed. The approach circumvents pump pulse distortions that result from non-collinear approaches and the need for external compression. It is particularly efficient for the generation of pulses with durations of few to tens of cycles. For instance, calculations accounting for cascading effects predict conversion efficiencies in the few percent range and focused electric fields 100 MV/m in cryogenically cooled lithium niobate. Copyright © 2017, The Authors. All rights reserved.

关键词： Niobium compounds

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Submission of regular paper to materials science and engineering: A the effect of cold rolling degree on microstructure, crystallographic texture and mechanical properties of Haynes® 282® wrought nickel superalloy

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Materials science and Engineering: A 2020年 787卷

作者： Polkowska, Adelajda Lech, Sebastian Polkowski, Wojciech Lukasiewicz Research Network – Krakow Institute of Technology Zakopiańska 73 Str. Krakow30-418 Poland AGH University of Science and Technology International Centre of Electron Microscopy for Materials Science and Faculty of Metals Engineering and Industrial Computer Science Mickiewicza 30 Avd Krakow30-059 Poland

Haynes® 282® is a newly developed wrought gamma prime strengthened nickel-based superalloy, introduced as a direct response for the existed limitations of Inconel 718 and Waspaloy in terms of gas-turbine applications. The mechanical response of the alloy is controlled by either a cold straining processing in solid solution annealed state, as well as through a post-deformation heat treatment. Since, there is a number of works on the effect of aging parameters on the low and high temperature strength of Haynes® 282® superalloy, very limited information is available on the microstructure, crystallographic texture and mechanical properties evolution upon the applied cold deformation step. In this work, Haynes® 282® superalloy provided in the solid-solution annealed state was subjected to the cold rolling processing up to 70% of thickness reduction. The SEM/EBSD and TEM methods were applied to examine a strain-induced structural evolution of the material, while mechanical characteristics were evaluated in microhardness measurements and static tensile tests carried out by using non-standard miniaturized specimens. © 2020 The Author(s)

关键词： Cold rolling

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Adiabatic sum-frequency generation in the visible region

Adiabatic sum-frequency generation in the visible region

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Advanced Solid State Lasers, ASSL 2013

作者： Cankaya, Huseyin Calendron, Anne-Laure Suchowski, Haim Kärtner, Franz X. Center for Free-Electron Laser Science Deutsches Elektronen Synchrotron Notkestrasse 85 22607 Hamburg Germany Department of Physics and the Hamburg Center for Ultrafast Imaging University of Hamburg Luruper Chaussee 149 D-22761 Hamburg Germany University of California Berkeley CA-94720 United States Department of Electrical Engineering and Computer Science Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA 02139 United States

We demonstrated adiabatic sum-frequency generation with 92 % photon conversion efficiency between a white-light continuum and a strong pump at 1030 nm to cover the spectral range of 405-500 nm by using an aperiodicall...

ISBN: (纸本)9781557529824

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Dispersion management for two-octave-spanning high-energy sub-optical-cycle parametric waveform synthesizers

Dispersion management for two-octave-spanning high-energy su...

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Advanced Solid State Lasers, ASSL 2014

作者： Chia, Shih-Hsuan Cirmi, Giovanni Fang, Shaobo Rossi, Giulio M. Mücke, Oliver D. Kärtner, Franz X. Center for Free-Electron Laser Science Deutsches Elektronen-Synchrotron DESY Notkestraße 85 Hamburg22607 Germany Physics Department University of Hamburg Luruper Chaussee 149 Hamburg22761 Germany The Hamburg Center for Ultrafast Imaging Luruper Chaussee 149 Hamburg22761 Germany Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics Massachusetts Institute of Technology CambridgeMA02139 United States

We discuss the dispersion management for multi-mJ 2-octave-wide (0.5-2.3 μm) 3-channel parametric waveform synthesizers to support 1.9-fs sub-cycle light transients. >2-octave-spanning laser optics are demonstrate... 详细信息

ISBN: (纸本)9781557528223

关键词： Dispersions

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Characterization of timing jitter in ultrafast fiber and Ti:S lasers

Characterization of timing jitter in ultrafast fiber and Ti:...

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General Assembly and Scientific Symposium, URSI

作者： Jonathan A. Cox Andrew J. Benedick Franz X. Kärtner Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA USA 2DESY-Center Free-Electron Laser Science and Hamburg University Hamburg Germany

The timing jitter of erbium doped, fiber optic and Titanium: Sapphire lasers, both passively mode-locked ultrafast lasers at 80 MHz, is measured with unprecedented resolution and bandwidth. Using the balanced optical cross-correlator timing detector, we found a total integrated timing jitter of 2.2 fs rms [100 Hz, 1 MHz] for the fiber supercontinuum and only 55 as rms [100 Hz, 10 MHz] jitter for the Ti:S laser. This measurement of fiber laser jitter is an absolute measurement, since the jitter of the fiber laser was measured against the Ti:S laser, which is negligible.

关键词： Measurement by laser beam Erbium-doped fiber lasers Jitter Free electron lasers Laser noise Masers Laser mode locking

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High-energy optical waveform synthesis

High-energy optical waveform synthesis

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Frontiers in Optics

作者： Kärtner, Franz X. Center for Free-Electron Laser Science Deutsches Elektronen-Synchrotron DESY Notkestraße 85 Hamburg22607 Germany Department of Physics University of Hamburg Luruper Chaussee 149 Hamburg22761 Germany The Hamburg Center for Ultrafast Imaging Luruper Chaussee 149 Hamburg22761 Germany Department of Electrical Engineering and Computer Science Research Laboratory of Electronics Massachusetts Institute of Technology CambridgeMA02139 United States

We will review recent approaches towards high-energy optical waveform synthesis. This technology overcomes limitations due to the finite amplifier bandwidth and promises sub-opticalcycle pulses ideal to drive isolated... 详细信息

ISBN: (纸本)1557522863

关键词： Attosecond pulses Hollow core fibers Nonlinear optical crystals Optical amplifiers Pulse generation Strong field physics General (000.0000) General science (000.2700)

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High energy and power optical waveform synthesis

High energy and power optical waveform synthesis

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CLEO: science and Innovations, CLEO-SI 2015

We report on recent progress in high-energy optical waveform synthesis with optical parametric amplifiers pumped by high-energy Ti:Sapphire and Yb-based lasers delivering more than 2-octave spanning sub-cycle waveform... 详细信息

ISBN: (纸本)9781557529688

关键词： Hollow core fibers Nonlinear optical crystals Nonlinear optics Optical amplifiers Strong field physics Ti:sapphire lasers

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High-energy carrier-envelope phase-stable optical waveforms compressible to >1 fs using induced-phase modulation in an argon-filled hollow-core fiber

High-energy carrier-envelope phase-stable optical waveforms ...

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High Intensity Lasers and High Field Phenomena, HILAS 2014

作者： Fang, Shaobo Ye, Hong Cirmi, Giovanni Chia, Shih-Hsuan Carbajo, Sergio Mücke, Oliver D. Kärtner, Franz X. Center for Free-Electron Laser Science Deutsches Elektronen-Synchrotron DESY Notkestraße 85 22607 Hamburg Germany Physics Department University of Hamburg Luruper Chaussee 149 22761 Hamburg Germany The Hamburg Center for Ultrafast Imaging Luruper Chaussee 149 22761 Hamburg Germany Department of Electrical Engineering Computer Science and Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge Massachusetts 02139 United States

We demonstrate phase-stable, ~0.4-mJ optical waveforms based on induced-phase modulation for generating sub-fs optical pulses. Using custom-designed double-chirped mirrors and a spatial light modulator, such optical w... 详细信息

ISBN: (纸本)9781557529954

关键词： Argon

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Accurate photonic analog-to-digital conversion

Accurate photonic analog-to-digital conversion

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General Assembly and Scientific Symposium, URSI

作者： Anatol Khilo Cheryl M. Sorace Jonathan R. Birge Franz X. Kärtner Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA USA Notkestrasse 85 DESY-Center for Free-Electron Laser Science and Hamburg University Hamburg Germany

Photonic analog-to-digital converters (ADCs) are attracting significant interest due to promise of overcoming the problem of aperture jitter and improving ADC performance level by orders of magnitude. This work examines several critical factors which define the accuracy of an optically-sampled wavelength-demultiplexed ADC built on a silicon chip using silicon photonic technology. These factors are the optical power-dependent shot noise, optical power-dependent nonlinearities due to two-photon and free-carrier absorption in silicon, and nonlinear transfer function of a silicon modulator. Ways to reduce the impact of these factors on ADC accuracy are considered.

关键词： Modulation Photonics Silicon Nonlinear optics Optical pulses Optical filters Optical distortion

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Relative intensity noise and timing jitter of Raman soliotns

Relative intensity noise and timing jitter of Raman soliotns

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Advanced Solid State Lasers, ASSL 2014

作者： Zhou, Gengji Xin, Ming Liu, Wei Kärtner, Franz X. Chang, Guoqing Center for Free-Electron Laser Science DESY Notkestraße 85 Hamburg22607 Germany Physics Department University of Hamburg Luruper Chaussee 149 Hamburg22761 Germany The Hamburg Centre for Ultrafast Imaging Luruper Chaussee 149 Hamburg22761 Germany Department of Electrical Engineering and Computer Science Research Laboratory of Electronics Massachusetts Institute of Technology 77 Massachusetts Avenue CambridgeMA02139 United States

We investigate the dependence of the relative intensity noise and timing jitter of Raman solitons on optical fiber parameters, and obtain a Raman soliton at 1303 nm with 2.0 fs relative timing jitter. © 2014 Opti... 详细信息

ISBN: (纸本)9781557528223

关键词： Timing circuits

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