Relativistic high harmonic generation in gas jet targets

Pirozhkov, Alexander S.; Kando, M.; Esirkepov, T. Zh.; Gallegos, P.; Ahmed, H.; Рагозин, Е. Н.; Faenov, A. Ya.; Pikuz, T. A.; Kawachi, Tetsuya; Sagisaka, A.; Koga, James; Coury, M.; Green, J.; Foster, P.; Brenner, Ceri; Dromey, B.; Symes, D. R.; Mori, M.; Kawase, K.; Kameshima, Takashi; Fukuda, Yuji; Chen, L. M.; Daito, I.; Hayashi, Yukio; Kotaki, Hajime; Kiriyama, Hiromitsu; Okada, Hajime; Nishimori, N.; Imazono, Takashi; Kondo, K.; Kimura, Toyoaki; Tajima, T.; Daido, Hiroyuki; Rajeev, P. P.; McKenna, P.; Borghesi, M.; Neely, D.; Kato, Yoshiaki; Bulanov, S. V.

doi:10.1063/1.4737557

Cited by 3 publications

(3 citation statements)

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“…Successful implementation of this technique enables the observation of wake waves in a plasma behind the laser driver [1][2][3] , injection dynamics [4,5] and magnetic field structures [6] in electron acceleration process [7] . Significantly interesting is the optical probing of electron density singularities of a relativistic plasma [8] capable of reflecting light via the double Doppler effect in the relativistic flying mirror mechanism [9][10][11][12] or emitting bright coherent soft-X-ray radiation in the course of Burst Intensification by Singularity Emitting Radiation (BISER) [13][14][15][16][17][18] . However, images of sharply localized relativistic singularities obtained by means of ultra-short probe pulses with duration τ are blurred to sizes ∼ cτ due to the motion blur; here c is the speed of light.…”

Section: Introductionmentioning

confidence: 99%

In-vacuum post-compression of optical probe pulses for relativistic plasma diagnostics

Lorenz,

Grittani,

Kondo

et al. 2024

High Pow Laser Sci Eng

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Ultrafast optical probing is a widely used method of underdense plasma diagnostic. In relativistic plasma, the motion blur limits spatial resolution in the direction of motion. For many high-power lasers the initial pulse duration of 30-50 fs results in a 10-15 µm motion blur, which can be reduced by probe pulse post-compression. Here we used the Compression after Compressor Approach (CafCA) [Phys.-Usp. 62, 1096; JINST 17 P07035 (2022)], where spectral broadening is performed in thin optical plates and is followed by reflections from negative-dispersion mirrors. Our initially low-intensity probe beam was down-collimated for a more efficient spectral broadening and higher probeto-self-emission intensity ratio. The setup is compact, fits in vacuum chamber, and can be implemented within a short experimental time slot. We proved that the compressed pulse kept high quality necessary for plasma probing.

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Section: Introductionmentioning

confidence: 99%

In-vacuum post-compression of optical probe pulses for relativistic plasma diagnostics

Lorenz,

Grittani,

Kondo

et al. 2024

High Pow Laser Sci Eng

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“…This cusp singularity is situated near the laser pulse head, and is strongly driven by the laser field. The accelerated motion of the electrons in the singularity leads to high-frequency radiation, while the singularity sharpness ensures constructive interference, producing a bright coherent x-ray pulse [17,[22][23][24][25][26][27] termed Burst Intensification by Singularity Emitting Radiation (BISER) [28]. BISER has an unprecedentedly small source size: sub-m measured directly (limited by the resolution of employed xray optics) and down to 10 nm predicted by the PIC simulations [28].…”

Section: Introductionmentioning

confidence: 99%

Optical probing of relativistic plasma singularities

Esirkepov

et al. 2020

Physics of Plasmas

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Singularities in multi-stream flows of relativistic plasmas can efficiently produce coherent highfrequency radiation, as exemplified in the concepts of the Relativistic Flying Mirror [S. V. Bulanov, et al., Phys. Rev. Lett. 91, 085001 (2003)] and Burst Intensification by Singularity Emitting Radiation (BISER) [Pirozhkov, et al., Scientific Reports 7, 17968 (2017)]. Direct observation of these singularities is challenging due to their extreme sharpness (tens of nanometers), relativistic velocity, and transient nonlocal nature. We propose to use an ultrafast (a few light cycles) optical probe for identifying relativistic plasma singularities. Our Particle-in-Cell (PIC) simulations show that this diagnostic is feasible.

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“…В ряде экспериментов требуется пространственное разрешение ∼ 10 µm и даже ∼ 1 µm. Примерами могут служить, например, компактные источники излучения, получаемые в экспериментах по генерации высоких гармоник в релятивистской лазерной плазме под действием излучения мультитераваттного фемтосекундного лазера [1] и генерация коротковолнового излучения при отражении излучения Ti : сапфирового лазера от релятивистской плазменной волны, возбуждаемой в импульсной струе гелия (релятивистское " летящее зеркало") [2]. Поскольку ВУФ излучение сильно поглощается в воздухе и большинстве материалов, для построения спектральных изображений в этом диапазоне используются отражательная и дифракционная фокусирующая оптика [3,4].…”

Section: Introductionunclassified

Изображающий Спектрограф Нормального Падения На Основе Апериодической Сферической Решетки Для Вакуумной Области Спектра

Вишняков¹,

Колесников²,

Рагозин³

et al. 2018

Журнал Технической Физики

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Рассмотрена возможность компенсации астигматизма в широком интервале длин волн в схемах нормального падения на основе сферической дифракционной решетки с переменным шагом. Рассчитаны две схемы изображающих спектрографов с габаритами около 1 и 5 m для диапазонов длин волн 820−1690

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Relativistic high harmonic generation in gas jet targets

Cited by 3 publications

References 0 publications

In-vacuum post-compression of optical probe pulses for relativistic plasma diagnostics

In-vacuum post-compression of optical probe pulses for relativistic plasma diagnostics

Optical probing of relativistic plasma singularities

Изображающий Спектрограф Нормального Падения На Основе Апериодической Сферической Решетки Для Вакуумной Области Спектра

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