Nonlinear theory of a free-electron laser exploiting media with a periodically modulated refractive index

Artemyev, A.I.; Федоров, М. В.; McIver, John K.; Shapiro, E. A.

doi:10.1109/3.655003

Cited by 5 publications

(3 citation statements)

References 14 publications

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“…of a series of layers of different materials with different refractive indices (see [2] and references therein). Note that a closely related but simpler effect of a stimulated trans ition emission was observed experimentally [4] in a scheme similar to that suggested in [1,2] but without media modulation. Free electron lasers and strophotrons [2] can be used as broadly tunable and very powerful sources of infrared light.…”

Section: Introductionsupporting

confidence: 62%

“…A short-wavelength radiation can be generated by a FEL using either a highenergy (multi-GeV) electron beam or undulators with a short period. One way of constructing short-period undulator-like media can be related with using media with a periodically modulated refractive index (MPMRI) [1][2][3]. MPMRI can be considered as a kind of a volume diffraction grating.…”

Section: Introductionmentioning

confidence: 99%

“…MPMRI can be considered as a kind of a volume diffraction grating. The following two types of MPMRI can be used: (1) a gas-plasma medium with periodically varied density or degree of ionization [1] and (2) a spatially periodical solid-state superlattice-like (SLL) structure, which can be composed, e.g. of a series of layers of different materials with different refractive indices (see [2] and references therein).…”

Section: Introductionmentioning

confidence: 99%

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Diffusive radiation in the infrared region

Gevorkian

Oganesyan

2016

Laser Phys. Lett.

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Diffusive radiation generated when a charged particle crosses a disordered stack of plates in the infrared region is considered. The main mechanism causing radiation is multiple scattering of electromagnetic field that is more effective in a medium with near to zero average dielectric permittivity. To obtain such a system we suggest using a stack of plates with a negative dielectric constant that, with a positive vacuum value, makes the average dielectric constant near to zero. Numerical estimates for realistic systems are presented.

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Section: Introductionsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diffusive radiation in the infrared region

Gevorkian

Oganesyan

2016

Laser Phys. Lett.

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Gas–plasma and superlattice free-electron lasers exploiting a medium with periodically modulated refractive index

Аполлонов¹,

Artemyev²,

Федоров³

et al. 1998

Laser Part. Beams

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Free-electron lasers exploiting media with periodically modulated refractive indices are studied. The regime of large modulation is considered, and the conditions of its realization are discussed. Two types of media with periodically modulated refractive indices are analyzed: a gas-plasma medium with a periodically varying degree of ionization and a superlattice-like medium. The gain, saturation field, and efficiency of these free-electron lasers are found. For any given frequency, the gain is optimized with respect to the choice of electron energy, direction of motion, and other parameters. Its relationship with other types of free-electron lasers (e.g., the Cherenkov laser) is discussed.

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Transition free-electron laser (amplifier) driven by an electron bunch

Oganesyan

1999

Phys. Rev. E

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A theory of transition free-electron laser ͑FEL͒ driven by an electron bunch of finite longitudinal length is presented. It is shown that one can introduce concepts of a long, a short, and a very short bunch depending on the degree of correlation between the bunch effective length and the transition radiation formation length. It is obtained that a long Gaussian bunch produces an electromagnetic pulse with a double-exponent-type envelope exp͓exp(Ϫ 2 )͔, whereas in the short bunch case the latter has an oscillating nature. Both analytic and numerical studies show that the long bunch compression into the short one improves the bunch-field coupling and results in the enhancement of the logarithm of a gain at the pulse center by nearly one order. The further bunch compression leads to the gain vanishing. It is noted that a similar picture is probably possible for an undulator FEL. The results are generalized for a bunch train. ͓S1063-651X͑99͒06103-6͔ PACS number͑s͒: 41.60.Cr Electromagnetic waves produced by the passage of a charged particle through the interface between two media with different dielectric constants are known as transition radiation ͑TR͒ ͓1͔. In contrast to the Cherenkov effect ͓when the radiated frequencies are limited by n()Ͼ1 condition͔ and to the Compton ͑or undulator͒ effect ͑where the frequencies are bounded both by the wavelength of a pump wave and by the energy E of an electron beam͒, in the device there are no restrictions on frequency values ͑of course, except for an obvious condition បϽEϪmc 2 ͒. Hence the transition radiation seems to be a very suitable source for a tunable free-electron laser ͑FEL͒. An analysis of single-particle spontaneous TR has been done in a great number of both theoretical and experimental works and generalized in monographs ͓2-4͔. Coherent TR, produced by an electron bunch ͑e bunch͒ with a length l, which is of the order of or smaller than the emission wavelength , was studied in ͓5͔. Reference ͓6͔ marked the beginning of studies of the stimulated transition effect. A number of both linear and nonlinear effects considered in our papers ͑including a charged particle acceleration, an e beam modulation and polarization, and an electromagnetic wave amplification, for such configurations as a single interface, a dielectric plate, a resonant medium͒ were summarized in Ref. ͓7͔, Sec. III. Here one can find a number of references in the field as well. Our analysis showed ͓7͔ that a notable gain in a transition laser ͑TL͒ driven by an ordinary e beam could be achieved in a lowfrequency range. Interesting ways of the FEL gain increasing in a high-frequency range have been discussed in ͓8,9͔. Note that there is a well-known approach for the transition effect increasing based on a resonant medium ͓2,3͔. The possibilities for such a device application for the ultraviolet and x-ray FEL were considered in ͓10-12͔.As was shown in ͓7͔, in a space-heterogeneous medium one may consider a monochromatic amplified signal as a superposition of plane waves which have the same frequency, b...

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Nonlinear theory of a free-electron laser exploiting media with a periodically modulated refractive index

Cited by 5 publications

References 14 publications

Diffusive radiation in the infrared region

Diffusive radiation in the infrared region

Gas–plasma and superlattice free-electron lasers exploiting a medium with periodically modulated refractive index

Transition free-electron laser (amplifier) driven by an electron bunch

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