Generation of 3D ellipsoidal laser beams by means of a profiled volume chirped Bragg grating

Mironov, S. Yu.; Poteomkin, A.; Gacheva, E. I.; Андрианов, А. В.; Zelenogorskii, V V; Vasiliev, R.; Smirnov, Vadim; Krasilnikov, M.; Stephan, F.; Хазанов, Е. А.

doi:10.1088/1612-2011/13/5/055003

Cited by 28 publications

(9 citation statements)

References 9 publications

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“…The analysis is performed for the following laser pulse parameters: central wavelength λ = 1.034 µm, full width at half maximum (FWHM) ∆λ FWHM = 8 nm, and FTL duration τ F = 198 fs. These parameters correspond to the output pulses at the front end of the laser system [36] that is planned to be used for the irradiation of photocathodes at the Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS), and are close to those described in the section 3. We determine the FWHM duration of the linearly chirped laser pulse, τ, and the time difference between the 90% and 10% intensity levels, δτ.…”

Section: Numerical Analysis Of Quasi-triangular Laser Pulse Shapingmentioning

confidence: 94%

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Shaping triangular picosecond laser pulses for electron photoinjectors

Kudzej¹,

Mironov²,

Gacheva³

et al. 2018

Laser Phys. Lett.

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Beam driven wakefield acceleration is one of the most advanced novel accelerator concepts. This process occurs in a plasma or a slow-wave structure in which the drive beam deposits energy in the form of a wake and the main beam is accelerated by this wake. For efficient acceleration, it is important to shape the drive beam current and to increase the so-called transformer ratio: the energy gain by the main beam to the energy loss of the drive beam. Triangular bunch shapes are among the most promising distributions considered for increasing the transformer ratio. In most cases, the drive beam is shaped with the help of electron beam phase space manipulation along with removal of portions of the beam with a scraper. This type of shaping is complicated by itself, causing charge loss and thermal heating, but also leads to beam instabilities due to the altered phase space of the beam. In this paper, we demonstrate experimentally the shaping of picosecond laser pulses in the form of a triangle with the help of a spatial light modulator. Such laser pulses can be used to generate a triangular electron bunch from a photoinjector. Considerations on the required pulse profile, comparison to other shaping methods, experimental results, and numerical analysis of the impact of pulse shaper parameters on the reproducibility of the triangular laser pulse shape are presented.

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Section: Numerical Analysis Of Quasi-triangular Laser Pulse Shapingmentioning

confidence: 94%

“…We present here an extension of the recently demonstrated laser pulse shaping method [35][36][37][38][39] to triangular laser pulses suitable for the extraction of picosecond triangular electron bunches from a photoinjector. The pulse shaping method is based on spectral amplitude shaping of linearly chirped laser pulses using SLMs.…”

Section: Introductionmentioning

confidence: 99%

Shaping triangular picosecond laser pulses for electron photoinjectors

Kudzej¹,

Mironov²,

Gacheva³

et al. 2018

Laser Phys. Lett.

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“…A new, very promising method for 3DESP generation with potentially perfect axial symmetry was proposed in [11]. A specially profiled chirped volume bragg grating (CVBG) was used, where the 3D bunch shape was encoded into the volume of the photorefractive glass chip, thus providing spatialfrequency coupling.…”

Section: Introductionmentioning

confidence: 99%

Shaping ellipsoidal laser pulses in the scheme with black analog masks for photoinjector applications

Gacheva,

Martyanov,

Poteomkin

et al. 2023

Laser Phys. Lett.

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Today the electron beam emittance minimization race seems to slack due to insufficiency of beam shaping techniques. To fill the gap we propose a method for shaping a sharp 3D ellipsoidal boundary of laser pulses used in a photoinjector. To avoid distortions in the profiled laser beam, only black analog masks are exploited as shaping elements. A highly promising experimental distribution with a 3D boundary thickness better than 10% was obtained at the fundamental harmonic. The proposed scheme can be easily modified for multiplied harmonics of radiation.

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“…Our technique is peculiar for the linear relationship between the spectral and the temporal pulse intensity distributions, which is achieved by the large linear chirping of the input pulse. This assumption was tested experimentally in [5]. A single-mode fiber output of the shaping scheme ensures the uniformity of the temporal profile across the beam cross-section.…”

Section: Introductionmentioning

confidence: 99%

Distortion-free temporal profiling of chirped picosecond laser pulses by spectral shaping with opaque solid masks

et al. 2020

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We propose a method for laser pulse temporal shaping applying just an opaque solid 2D mask as a shaping element. The research is motivated by recent experimental data on temporal distortions produced in chirped picosecond pulses by spatial light modulators (SLMs) commonly used in shaping schemes and consequent demand for alternative solutions.In the presented scheme, the effect of grey-level masking in the spectral domain is achieved by dimensional reduction from 2D shaping on air to 1D obtained modulation at the fiber output. The mask is placed in the Fourier plane of a compressor with zero frequency dispersion. Instead of a spherical telescope in the compressor, a cylindrical one is used. Due to large linear chirp in the input pulse, spectral profile corresponds to the temporal distribution.We demonstrated in the experiment conversion of a 40 ps bell-shaped pulse into a rectangular pulse, demanded, for example, in photoinjector technology. Our scheme showed itself as a cheap and easy alternative to SLM shaping, therefore we believe it can be interesting for some applications.

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Generation of 3D ellipsoidal laser beams by means of a profiled volume chirped Bragg grating

Cited by 28 publications

References 9 publications

Shaping triangular picosecond laser pulses for electron photoinjectors

Shaping triangular picosecond laser pulses for electron photoinjectors

Shaping ellipsoidal laser pulses in the scheme with black analog masks for photoinjector applications

Distortion-free temporal profiling of chirped picosecond laser pulses by spectral shaping with opaque solid masks

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