Efficient generation of ultra-intense few-cycle radially polarized laser pulses

Carbajo, Sergio; Granados, Eduardo; Schimpf, Damian N.; Sell, Alexander; Hong, Kyung-Han; Moses, Jeffrey; Kärtner, Franz X.

doi:10.1364/ol.39.002487

Cited by 56 publications

(27 citation statements)

References 20 publications

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“…Figure 1 shows the acceleration of 30 keV electrons (2.5% spread) to 7.7 MeV (2.5% energy spread) with a 25 mJ pulse. The scheme we study uses the ultrafast radially-polarized laser pulse 50 , 51 , an attractive candidate for electron acceleration due to the ability of its transverse fields to confine electrons to the axis exactly where the longitudinal electric field peaks and linear-field particle acceleration is most effective. We use a carrier wavelength of 0.8 μm, full-width-at-half-maximum (FWHM) pulse duration 3 fs (6 fs is studied in SI Section 6), and waist radii (second irradiance moment at focal plane) ranging from w 0 = 0.8 μm to 5.0 μm.…”

Section: Introductionmentioning

confidence: 99%

Laser-Induced Linear-Field Particle Acceleration in Free Space

Wong

Hong

Carbajo

et al. 2017

Sci Rep

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Linear-field particle acceleration in free space (which is distinct from geometries like the linac that requires components in the vicinity of the particle) has been studied for over 20 years, and its ability to eventually produce high-quality, high energy multi-particle bunches has remained a subject of great interest. Arguments can certainly be made that linear-field particle acceleration in free space is very doubtful given that first-order electron-photon interactions are forbidden in free space. Nevertheless, we chose to develop an accurate and truly predictive theoretical formalism to explore this remote possibility when intense, few-cycle electromagnetic pulses are used in a computational experiment. The formalism includes exact treatment of Maxwell’s equations and exact treatment of the interaction among the multiple individual particles at near and far field. Several surprising results emerge. We find that electrons interacting with intense laser pulses in free space are capable of gaining substantial amounts of energy that scale linearly with the field amplitude. For example, 30 keV electrons (2.5% energy spread) are accelerated to 61 MeV (0.5% spread) and to 205 MeV (0.25% spread) using 250 mJ and 2.5 J lasers respectively. These findings carry important implications for our understanding of ultrafast electron-photon interactions in strong fields.

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Section: Introductionmentioning

confidence: 99%

Laser-Induced Linear-Field Particle Acceleration in Free Space

Wong

Hong

Carbajo

et al. 2017

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“…This work is also motivated by recent advances in the technology of radially polarized laser systems [41,42]. For modeling ultra-short ultrastrong laser pulses, the paraxial solutions of Maxwell's equations are no longer adequate [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic fields of an ultra-short tightly-focused radially-polarized laser pulse

Salamin

2017

Optics Communications

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Fully analytic expressions, for the electric and magnetic fields of an ultrashort and tightly focused laser pulse of the radially polarized category, are presented to lowest order of approximation. The fields are derived from scalar and vector potentials, along the lines of our earlier work for a similar pulse of the linearly polarized variety. A systematic program is also described from which the fields may be obtained to any desired accuracy, analytically or numerically.

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“…In this context, 2.1 kW average power with M 2 < 10 was demonstrated using Nd:YAG rod amplifiers [15]. Regarding ultrafast laser systems, a very high peak power of 85 GW (at 2 W of average power) was obtained using a Ti:Sa laser system, a segmented waveplate, and a compression stage [16]. In terms of state-of-the-art in average power for ultrafast laser systems, 85 W of average power were recently demonstrated with a multi-stage single-crystal fiber amplifier with pulse duration of 740 fs at 20 MHz repetition rate [17].…”

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confidence: 99%

Radially polarized emission with 635 W of average power and 21 mJ of pulse energy generated by an ultrafast thin-disk multipass amplifier

et al. 2015

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We report on a thin-disk multipass amplifier delivering radially polarized laser pulses with an average power of 635 W and 2.1 mJ of pulse energy. To the best of our knowledge, this is the highest average output power and pulse energy reported so far for radially polarized ultrafast lasers. The amplifier is seeded by a TruMicro5050 with 115 W of average output power, 6.5 ps pulse duration, and a repetition rate of 300 kHz. A segmented half-waveplate was used for converting the linearly polarized beam into radial polarization in front of the amplifier. We present a scheme for direct amplification of such doughnut-shaped radially-polarized beams, the results obtained, and a solution to compensate for the depolarizing phase shift introduced by the tilted mirrors in the amplifier.

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Efficient generation of ultra-intense few-cycle radially polarized laser pulses

Cited by 56 publications

References 20 publications

Laser-Induced Linear-Field Particle Acceleration in Free Space

Laser-Induced Linear-Field Particle Acceleration in Free Space

Electromagnetic fields of an ultra-short tightly-focused radially-polarized laser pulse

Radially polarized emission with 635 W of average power and 21 mJ of pulse energy generated by an ultrafast thin-disk multipass amplifier

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