Results 241 to 250 of about 566,112 (285)
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2013
Data storage applications of magnetism utilize dynamic processes on sub-nanosecond time scales and on length scales of less than 100 nm. Magnetization dynamics on the sub-picosecond time scale has been observed and may lead the way to novel devices.
Andreas Fognini, Yves Acremann
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Data storage applications of magnetism utilize dynamic processes on sub-nanosecond time scales and on length scales of less than 100 nm. Magnetization dynamics on the sub-picosecond time scale has been observed and may lead the way to novel devices.
Andreas Fognini, Yves Acremann
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Bell System Technical Journal, 1978
An introductory guide to the basic mechanisms of the free electron laser is presented. The laser gain originates from the stimulated Raman or Compton backscattering of a pump electromagnetic field by a relativistic electron beam. The condition of optimization of the gain, the maximum operation frequency, and the optimum output power are obtained in ...
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An introductory guide to the basic mechanisms of the free electron laser is presented. The laser gain originates from the stimulated Raman or Compton backscattering of a pump electromagnetic field by a relativistic electron beam. The condition of optimization of the gain, the maximum operation frequency, and the optimum output power are obtained in ...
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Radiation Physics and Chemistry, 2004
Abstract Free-electron lasers (FELs) are classical lasers that can provide widely tunable, highly intense, ultrashort laser pulses in any part of the spectrum. We present here the basic principles and advantages of FELs, discuss the emergence of self-amplified spontaneous emission FELs as leading candidates for X-ray lasers and fourth-generation ...
Srinivas Krishnagopal, Vinit Kumar
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Abstract Free-electron lasers (FELs) are classical lasers that can provide widely tunable, highly intense, ultrashort laser pulses in any part of the spectrum. We present here the basic principles and advantages of FELs, discuss the emergence of self-amplified spontaneous emission FELs as leading candidates for X-ray lasers and fourth-generation ...
Srinivas Krishnagopal, Vinit Kumar
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2020
In our description of undulator radiation, we saw the enormous gains that could be achieved if radiation from separate magnetic poles were added coherently. As a reminder, when N equal sources are added coherently, the produced intensity I varies as N2, compared to intensity gains of only N when the sources are added incoherently.
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In our description of undulator radiation, we saw the enormous gains that could be achieved if radiation from separate magnetic poles were added coherently. As a reminder, when N equal sources are added coherently, the produced intensity I varies as N2, compared to intensity gains of only N when the sources are added incoherently.
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2014
Free electron lasers are electron beam-based sources of coherent, high-power tunable radiation which can, in principle, be designed to operate at any wavelength ranging from mm waves to X-rays. In recent years, these devices have successfully been operated at THz and hard X-ray wavelengths where conventional sources of radiation are either not ...
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Free electron lasers are electron beam-based sources of coherent, high-power tunable radiation which can, in principle, be designed to operate at any wavelength ranging from mm waves to X-rays. In recent years, these devices have successfully been operated at THz and hard X-ray wavelengths where conventional sources of radiation are either not ...
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1997
In Chap. 1 we have shown that the interaction of electrons with an electromagnetic wave is possible even when the phase velocity of the latter is larger than \( c \), provided that there is a way to conserve simultaneously both energy and momentum. In a free-electron laser (FEL) this is facilitated by the presence of a periodic magnetic field.
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In Chap. 1 we have shown that the interaction of electrons with an electromagnetic wave is possible even when the phase velocity of the latter is larger than \( c \), provided that there is a way to conserve simultaneously both energy and momentum. In a free-electron laser (FEL) this is facilitated by the presence of a periodic magnetic field.
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1977
Lasers based on the stimulated emission of radiation by free electrons in a spatially periodic magnetic field offer a unique potential for tunable operation at high power and high efficiency. Substantial advances have been made recently in the theoretical analysis of this class of device and in the operation in our laboratory of a 10 μ free electron ...
John M. J. Madey, David A. G. Deacon
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Lasers based on the stimulated emission of radiation by free electrons in a spatially periodic magnetic field offer a unique potential for tunable operation at high power and high efficiency. Substantial advances have been made recently in the theoretical analysis of this class of device and in the operation in our laboratory of a 10 μ free electron ...
John M. J. Madey, David A. G. Deacon
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Free-electron lasing at 27 nanometres based on a laser wakefield accelerator
Nature, 2021Wentao Wang, Ke Feng, Lin Tong Ke
exaly