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Single Shot Measurement Of The Spectral Envelope Of Broad Bandwidth Terahertz Pulses From Femtosecond Electron Bunches
Download Single Shot Measurement Of The Spectral Envelope Of Broad Bandwidth Terahertz Pulses From Femtosecond Electron Bunches full books in PDF, epub, and Kindle. Read online Single Shot Measurement Of The Spectral Envelope Of Broad Bandwidth Terahertz Pulses From Femtosecond Electron Bunches ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Single-shot Measurement of the Spectral Envelope of Broad-bandwidth Terahertz Pulses from Femtosecond Electron Bunches by :
Download or read book Single-shot Measurement of the Spectral Envelope of Broad-bandwidth Terahertz Pulses from Femtosecond Electron Bunches written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a new approach (demonstrated experimentally and through modeling) to characterize the spectral envelope of a terahertz (THz) pulse in a single shot. The coherent THz pulse is produced by a femtosecond electron bunch and contains information on the bunch duration. The technique, involving a single low-power laser probe pulse, is an extension of the conventional spectral encoding method (limited in time resolution to hundreds of femtoseconds) into a regime only limited in resolution by the laser pulse length (tens of femtoseconds). While only the bunch duration is retrieved (and not the exact charge profile), such a measurement provides a useful and critical parameter for optimization of the electron accelerator.
Book Synopsis Single-shot Spatiotemporal Measurements of High-field Terahertz Pulses by :
Download or read book Single-shot Spatiotemporal Measurements of High-field Terahertz Pulses written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The electric field profiles of broad-bandwidth coherent terahertz (THz) pulses, emitted by laser-wakefield-accelerated electron bunches, are studied. The near-single-cycle THz pulses are measured with two single-shot techniques in the temporal and spatial domains. Spectra of 0-6 THz and peak fields up to ≃ 0.4 MV cm−1 are observed. The measured field substructure demonstrates the manifestation of spatiotemporal coupling at focus, which affects the interpretation of THz radiation as a bunch diagnostic and in high-field pump-probe experiments.
Download or read book Optics Letters written by and published by . This book was released on 2008 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Single-shot Spatio-temporal Measurements of High-field Terahertzpulses by :
Download or read book Single-shot Spatio-temporal Measurements of High-field Terahertzpulses written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The electric field profiles of broad-bandwidth coherentterahertz (THz) pulses, emitted by laserwakefield-accelerated electronbunches, are studied. The near-single-cycle THz pulses are measured withtwo single-shot techniques in the temporal and spatial domains. Spectraof 0 - 6 THz and peak fields up to ~; 0.4 MVcm-1 are observed. Themeasured field substructure demonstrates the manifestation ofspatio-temporal coupling at focus, which affects the interpretation ofTHz radiation as a bunch diagnostic and in high-field pump-probeexperiments. A ray-based model confirms the coupling.
Book Synopsis Single-shot Spatiotemporal Measurements of Ultrashort THz Waveforms Using Temporal Electric-field Cross Correlation by :
Download or read book Single-shot Spatiotemporal Measurements of Ultrashort THz Waveforms Using Temporal Electric-field Cross Correlation written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A new single-shot technique based on linear spectral interferometry between a temporally short reader pulse and a temporally long probe pulse is demonstrated for measuring the spatiotemporal phase and amplitude of an optical probe for use as an ultrafast diagnostic. The probe spatiotemporal field information is recovered, with a resolution set by the duration of the reader pulse, by applying a single Fourier transform operation to the interferogram image, without need of any reference data. The technique was used in conjunction with electro-optic sampling to measure waveforms of coherent, ultrashort THz pulses emitted by electron bunches from a laser-plasma accelerator with sub-50fs resolution. The presence of strong spatiotemporal coupling in the THz waveforms and of complex temporal electron-bunch structure was determined.
Book Synopsis A Study of Terahertz Time Domain Spectroscopy by : Yu-Liang Lin
Download or read book A Study of Terahertz Time Domain Spectroscopy written by Yu-Liang Lin and published by LAP Lambert Academic Publishing. This book was released on 2013 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work, we utilize femtosecond laser pulse shaping technology to study the role of chirp in generation and detection mechanism of Terahertz pulses with LT-GaAs photoconductive antenna. Experimental results show that the PC antenna excited with slightly up-chirped laser will generate THz pulses with higher peak amplitude, total power and broader bandwidth. In the detection process, similar behaviors have been observed. We use one dimensional Drude-Lorentz model to simulate THz generation and detection processes to analysis our experiment results. Finally, we use this coherently controlled THz-Time Domain Spectrometer to study the properties of several samples, such as fused silica, metal hole array and lactose. Experimental results show that we can utilize this spectrometer to get more reliable optical constants than the conventional approach.
Book Synopsis Principles of Terahertz Time-Domain Spectroscopy by : Jean-Louis Coutaz
Download or read book Principles of Terahertz Time-Domain Spectroscopy written by Jean-Louis Coutaz and published by CRC Press. This book was released on 2018-12-07 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: Terahertz time-domain spectroscopy (THz-TDS) is a unique technique for characterizing the response of materials and devices in the far-infrared region of the electromagnetic spectrum. Based on the measurement of transmitted or reflected ultra-short electromagnetic pulses and on a Fourier-transform of the recorded waveforms, THz-TDS permits fast and precise determination of the permittivity or permeability of materials over a wide bandwidth. This book is devoted to the determination of this spectral response of samples from the recorded waveforms.
Book Synopsis Sensing with Terahertz Radiation by : Daniel Mittleman
Download or read book Sensing with Terahertz Radiation written by Daniel Mittleman and published by Springer. This book was released on 2013-02-26 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this book is two-fold. First, the various different methods of accessing the THz range are discussed, with a view to convince the reader that there have been qualitative and significant improvements over older, more conventional techniques. The text makes it clear that these improvements enable practical "real-world" applications of THz technology, in a manner which would not have been possible before. Second, the demonstrations and feasibility tests described serve as compelling evidence of the utility of such devices. Due to the unique characteristics of THz radiation and its interaction with materials, these devices have substantial advantages over other competing technologies in a number of different areas.
Book Synopsis Terahertz Frequency Detection and Identification of Materials and Objects by : R.E. Miles
Download or read book Terahertz Frequency Detection and Identification of Materials and Objects written by R.E. Miles and published by Springer Science & Business Media. This book was released on 2007-09-08 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: Want an overview of where the technology of terahertz detection has been going? Here it is. The technology has largely been developed around expensive and bulky femtosecond laser systems but, as described in this book, advances in semiconductor superlattice technology are leading to compact "electronic" sources such as the quantum cascade laser, two-terminal "Gunn" type oscillators and even a THz frequency amplifier. These advances towards electronic (as opposed to optical) THz systems mean that the technology will become portable and much less costly.
Book Synopsis Single-cycle Terahertz Pulses With]0.2 V/A Field Amplitudes Via Coherent Transition Radiation by :
Download or read book Single-cycle Terahertz Pulses With]0.2 V/A Field Amplitudes Via Coherent Transition Radiation written by and published by . This book was released on 2012 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: We demonstrate terahertz pulses with field amplitudes exceeding 0.2 V/+!generated by coherent transition radiation. Femtosecond, relativistic electron bunches generated at the Linac Coherent Light Source are passed through a beryllium foil, and the emitted radiation is characterized as a function of the bunch duration and charge. Broadband pulses centered at a frequency of 10 THz with energies of 140?J are measured. These far-below-bandgap pulses drive a nonlinear optical response in a silicon photodiode, with which we perform nonlinear autocorrelations that yield information regarding the terahertz temporal profile. Simulations of the spatiotemporal profile agree well with experimental results.
Book Synopsis Production of High Power Femtosecond Terahertz Radiation by :
Download or read book Production of High Power Femtosecond Terahertz Radiation written by and published by . This book was released on 2003 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The terahertz (THz) region of the electromagnetic spectrum is attracting interest for a broad range of applications ranging from diagnosing electron beams to biological imaging. Most sources of short pulse THz radiation utilize excitation of biased semiconductors or electro-optic crystals by high peak power lasers. For example, this was done by using an un-doped InAs wafer irradiated by a femtosecond free-electron laser (FEL) at the Thomas Jefferson National Accelerator Facility. Microwatt levels of THz radiation were detected when excited with FEL pulses at 1.06 mm wavelength and 10W average power. Recently substantially higher powers of femtosecond THz pulses produced by synchrotron emission were extracted from the electron beamline. Calculations and measurements confirm the production of coherent broadband THz radiation from relativistic electrons with an average power of nearly 20W, a world record in this wavelength range by a factor of 10,000. We describe the source, presenting theoretical calculations and their experimental verification. Potential applications of this exciting new source include driving new non-linear phenomena, performing pump-probe studies of dynamical properties of novel materials, and studying molecular vibrations and rotations, low frequency protein motions, phonons, superconductor band gaps, electronic scattering, collective electronic excitations (e.g., charge density waves), and spintronics.
Book Synopsis Terahertz Radiation as a Bunch Diagnostic for Laser-wakefield-accelerated Electron Bunches by :
Download or read book Terahertz Radiation as a Bunch Diagnostic for Laser-wakefield-accelerated Electron Bunches written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental results are reported from two measurement techniques (semiconductor switching and electro-optic sampling) that allow temporal characterization of electron bunches produced by a laser-driven plasma-based accelerator. As femtosecond electron bunches exit the plasma-vacuum interface, coherent transition radiation (at THz frequencies) is emitted. Measuring the properties of this radiation allows characterization of the electron bunches. Theoretical work on the emission mechanism is presented, including a model that calculates the THz wave form from a given bunch profile. It is found that the spectrum of the THz pulse is coherent up to the 200?m thick crystal (ZnTe) detection limit of 4 THz, which corresponds to the production of sub-50 fs (rms) electron bunch structure. The measurements demonstrate both the shot-to-shot stability of bunch parameters that are critical to THz emission (such as total charge and bunch length), as well as femtosecond synchronization among bunch, THz pulse, and laser beam.
Book Synopsis Application of Femtosecond Pulse Shaping Techniques to Spectral Phase Measurement by : Kai-Chien Chu
Download or read book Application of Femtosecond Pulse Shaping Techniques to Spectral Phase Measurement written by Kai-Chien Chu and published by . This book was released on 1996 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Terahertz Spectroscopy by : Jamal Uddin
Download or read book Terahertz Spectroscopy written by Jamal Uddin and published by BoD – Books on Demand. This book was released on 2017-03-13 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: The terahertz regime of the electromagnetic spectrum was largely unexplored due to the lack of technology needed to generate and detect the radiation. However, in the last couple of decades, there has been a dramatic increase in tools needed to harness the radiation. This remarkable progress made in the development of terahertz sources, components, and detectors has resulted in an ever-increasing inquisitiveness of the applications of terahertz technology in a wide range of fields including medicine, pharmaceuticals, security, sensing, and quality assurance. This book, Terahertz Spectroscopy - A Cutting Edge Technology, presents an overview of the recent advances in terahertz technology and their application in a vast array of fields. The scientists and students are encouraged to read and share the content of this volume. The book also provides a good starting point for researchers who are new to the terahertz regime. The various chapters of the book have been written by renowned scientists in different parts of the world who are at the forefront of terahertz research fields. It is our (InTech publisher, editor, and authors) hope that this book will enhance knowledge and stimulate more interest and future research in terahertz technology.
Book Synopsis Terahertz Sensing Technology - Vol 1: Electronic Devices And Advanced Systems Technology by : Michael S Shur
Download or read book Terahertz Sensing Technology - Vol 1: Electronic Devices And Advanced Systems Technology written by Michael S Shur and published by World Scientific. This book was released on 2003-07-14 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: The last research frontier in high frequency electronics now lies in the so-called THz (or submillimeter-wave) regime between the traditional microwave and infrared domains. Significant scientific and technical challenges within the terahertz (THz) frequency regime have recently motivated an array of new research activities. During the last few years, major research programs have emerged that are focused on advancing the state of the art in THz frequency electronic technology and on investigating novel applications of THz frequency sensing. This book serves as a detailed reference for the new THz frequency technological advances that are emerging across a wide spectrum of sensing and technology areas.
Book Synopsis Ultrafast Imaging of Terahertz Pulses by : Zhenyou Wang
Download or read book Ultrafast Imaging of Terahertz Pulses written by Zhenyou Wang and published by . This book was released on 2013 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main purpose of this thesis is to develop terahertz (THz) generation, detection, and spectroscopy techniques via ultrafast imaging methods. Sampling THz pulse waveforms with a noncollinear imaging technique was carried out. Full-field images of the THz electric field waveforms sampled in E-mode can be used to perform THz spectroscopy, but multi-shots are required. On the other hand, the square of the THz electric field waveforms is obtained in a single shot in E2-mode, which enables single-shot THz spectroscopy of the transmitted THz power spectra. In order to study the THz generation process by optical rectification in LiNbO[subscript 3] crystals, we developed a novel transverse imaging technique to image the THz Cherenkov wave in side-view mode and top-view mode. Based on the images of the THz Cherenkov wave generated by the point focused optical pump pulse, parameters including the Cherenkov angle and group and phase velocities of the optical pump pulse and THz pulse, respectively, are measured directly. A transition-like radiation generated at the crystal boundary is imaged for the first time. Imaging distortions due to the transverse imaging geometry are simulated and a correction chart is made. We also imaged THz pulses generated with the titled-pulse-front excitation technique in real time. The real time visualization of THz pulse generation and propagation in LiNbO[subscript 3] crystals enables us to optimize the THz pulse generation efficiency in a more directway. Based on the transverse imaging technique, THz pulse reflection, transmission, and tunneling in various conditions are imaged, which may be useful in physics teaching demonstrations. Applications of the transverse imaging technique to image THz generation in periodically poled lithium niobate (PPLN), air plasmas generated by femtosecond laser pulses, and nonlinear optical Kerr effect signals induced by femtosecond laser pulses in CS2, quartz, water, methanol, and THF are explored. Finally, a new type of free-standing, frameless carbon nanotube array THz polarizer is fabricated and tested.
Book Synopsis Optimization and Single-Shot Characterization of Ultrashort THz Pulses from a Laser Wakefield Accelerator by :
Download or read book Optimization and Single-Shot Characterization of Ultrashort THz Pulses from a Laser Wakefield Accelerator written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present spatiotemporal characterization of J-class ultrashort THz pulses generated from a laser wakefield accelerator (LWFA). Accelerated electrons, resulting from the interaction of a high-intensity laser pulse with a plasma, emit high-intensity THz pulses as coherent transition radiation. Such high peak-power THz pulses, suitable for high-field (MV/cm) pump-probe experiments, also provide a non-invasive bunch-length diagnostic and thus feedback for the accelerator. The characterization of the THz pulses includes energy measurement using a Golay cell, 2D sign-resolved electro-optic measurement and single-shot spatiotemporal electric-field distribution retrieval using a new technique, coined temporal electric-field cross-Correlation (TEX). All three techniques corroborate THz pulses of 5 muJ, with peak fields of 100's of kV/cm and ~;;0:4 ps rms duration.
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