Generation of low-order Laguerre-Gaussian beams using hybrid-machined reflective spiral phase plates for intense laser-plasma interactions

Bae, Jeong Hwan; Jeon, Cheonha; Pae, Ki Hong; Kim, Chul Min; Kim, Hong Seung; Han, Ilkyu; Yeo, Woo-Jong; Jeong, Byeongjoon; Jeon, Minwoo; Lee, Dong‐Ho; Kim, Dong Uk; Hyun, Sangwon; Hur, Hwan; Lee, Kye-Sung; Kim, Geon Hee; Chang, Ki Soo; Choi, Il Woo; Nam, Chang Hee; Kim, I Jong

doi:10.1016/j.rinp.2020.103499

Cited by 18 publications

(9 citation statements)

References 39 publications

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“…One of the key advantages of the helical, or Laguerre-Gaussian, laser mode is that it can be produced, at high efficiency, from a standard Gaussian laser pulse in reflection from a fan-like structure [13,14]. Very significant differences can be seen when comparing the laserplasma interactions of conventional laser beams to those of helical beams, some of which have been examined in simulations [14][15][16][17][18][19][20][21][22][23], and some have begun to be explored in recent experiments [12,[24][25][26][27]]. An electron acceleration scheme has recently been proposed where a high-power high-intensity circular-polarized Laguerre-Gaussian beam is reflected from a plasma mirror [28].…”

Section: Introductionmentioning

confidence: 99%

Electron acceleration using twisted laser wavefronts

Shi¹,

Blackman²,

Arefiev³

2021

Plasma Phys. Control. Fusion

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Using plasma mirror injection we demonstrate, both analytically and numerically, that a circularly polarized helical laser pulse can accelerate highly collimated dense bunches of electrons to several hundred MeV using currently available laser systems. The circular-polarized helical (Laguerre–Gaussian) beam has a unique field structure where the transverse fields have helix-like wave-fronts which tend to zero on-axis where, at focus, there are large on-axis longitudinal magnetic and electric fields. The acceleration of electrons by this type of laser pulse is analyzed as a function of radial mode number and it is shown that the radial mode number has a profound effect on electron acceleration close to the laser axis. Using three-dimensional particle-in-cell simulations a circular-polarized helical laser beam with power of 0.6 PW is shown to produce several dense attosecond bunches. The bunch nearest the peak of the laser envelope has an energy of 0.47 GeV with spread as narrow as 10%, a charge of 26 pC with duration of ∼ 400 as, and a very low divergence of 20 mrad. The confinement by longitudinal magnetic fields in the near-axis region allows the longitudinal electric fields to accelerate the electrons over a long period after the initial reflection. Both the longitudinal E and B fields are shown to be essential for electron acceleration in this scheme. This opens up new paths toward attosecond electron beams, or attosecond radiation, at many laser facilities around the world.

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Section: Introductionmentioning

confidence: 99%

Electron acceleration using twisted laser wavefronts

Shi¹,

Blackman²,

Arefiev³

2021

Plasma Phys. Control. Fusion

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“…In the case of high intensity Chirped Pulse Amplification (CPA) lasers, the SPP has to be positioned after the compressor gratings to prevent any damage risk on the latter; therefore the pulse is recompressed, in which case it is advisable not to go through any glass plate, at least for multi-100-TW systems. Longman et al and Bae et al have proposed elegant ways to create a phase spiral on a bending mirror [8], [9]. In the case of high energy lasers, the size of the optics is the obvious issue, as these beams have a width typically in-between 30 cm and 1 m. Although it is possible to ion-etch phase plates of arbitrary size, it would be highly desirable to dispose of an easy and flexible way to create high quality OAM beams of large sizes, for which commercial or technical availability would not be an issue.…”

Section: Introductionmentioning

confidence: 99%

Design of Pauci-Adaptive, Spirally Tiled Mirrors for Large Size Optical Vortex Generation

Fauvel

Balcou

2023

J. Lightwave Technol.

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“…Concurrently, new optical techniques for producing helical wave-fronts [15,16,17,18,19,20] are also being developed. There now exist multiple computational [21,22,23,24,17,25,26,27,28,29] and experimental [15,18,30,31,32] studies examining interactions of helical laser beams with plasmas. There are also some published works on the terawatt scale helical laser production using a chirped-pulse amplification system [33,34].…”

Section: Introductionmentioning

confidence: 99%

Electron pulse train accelerated by a linearly polarized Laguerre–Gaussian laser beam

Shi

Blackman

Zhu

et al. 2022

High Pow Laser Sci Eng

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A linearly polarized Laguerre-Gaussian (LP-LG) laser beam with a twist index l = −1 has field structure that fundamentally differs from the field structure of a conventional linearly polarized Gaussian beam. Close to the axis of the LP-LG beam, the longitudinal electric and magnetic fields dominate over the transverse components. This structure offers an attractive opportunity to accelerate electrons in vacuum. It is shown, using three dimensional particle-incell simulations, that this scenario can be realized by reflecting an LP-LG laser off a plasma with a sharp density gradient. The simulations indicate that a 600 TW LP-LG laser beam effectively injects electrons into the beam during the reflection. The electrons that are injected close to the laser axis experience a prolonged longitudinal acceleration by the longitudinal laser electric field. The electrons form distinct monoenergetic bunches with a small divergence angle. The energy in the most energetic bunch is 0.29 GeV. The bunch charge is 6 pC and its duration is ∼ 270 as. The divergence angle is just 0.57 • (10 mrad). By using a linearly polarized rather than a circularly polarized Laguerre-Gausian beam, our scheme makes it easier to demonstrate the electron acceleration experimentally at a high-power laser facility.

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Generation of low-order Laguerre-Gaussian beams using hybrid-machined reflective spiral phase plates for intense laser-plasma interactions

Cited by 18 publications

References 39 publications

Electron acceleration using twisted laser wavefronts

Electron acceleration using twisted laser wavefronts

Design of Pauci-Adaptive, Spirally Tiled Mirrors for Large Size Optical Vortex Generation

Electron pulse train accelerated by a linearly polarized Laguerre–Gaussian laser beam

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