The output of a laser amplifier with simultaneous amplified spontaneous emission and an injected seed

Huang, Hai; Tallents, G. J.

doi:10.1017/s0263034609000500

Cited by 7 publications

(2 citation statements)

References 33 publications

(38 reference statements)

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“…Soft X-ray generation in cascade SASE FEL with two-frequency undulator For a two-frequency helical undulator [22] H = H 0 (sin(2πz/λ u1 ), dsin(h2πz/λ u2 ), 0) , (7) we have elliptic polarization with (x, y) components for the Bessel factor f n [22]:…”

Section: -P2mentioning

confidence: 99%

Soft X-ray generation in cascade SASE FEL with two-frequency undulator

Zhukovsky

2017

EPL

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The generation of soft X-ray radiation in cascade self-amplified spontaneous emission free electron laser (SASE FEL) using harmonics of a two-frequency undulator is studied. An advanced phenomenological model of SASE FEL, accounting for the properties of the undulator and of the electron beam, including major losses, is employed. The account for the beam energy spread, divergence and diffraction is harmonic dependent, which is a step forward from the previous models and phenomenological approach, which consider all the losses independent of the harmonic number. The model is validated with the experimental measurements of the FEL harmonic generation and with relevant three-dimensional numerical simulations. The model is adopted for the description of cascading SASE FELs. With its help the dynamics of high-gain harmonic generation (HGHG) SASE FEL cascades is analyzed to obtain the maximum high harmonic power in the X-ray band with the lowest possible seed frequency and the shortest FEL length. The advantages of the two-frequency undulator for SASE FEL in this context are demonstrated and the possibility of its usage in cascading HGHG SASE FEL is shown. Several types of cascade FELs with two-frequency undulators are simulated. Frequency multiplication in two, three and four stage cascades is introduced to obtain soft X-ray radiation. The possibility of the generation of a powerful radiation, 75 MW at λ ∼ 2.5-4.5 nm and a lower intensity 3rd harmonic, 100 kW at λ ∼ 1 nm, is demonstrated in multi-cascade FELs at just 20-35 meters with the seed wavelengths λ seed ∼ 140 nm, ∼40 nm and ∼ 11-13 nm.

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Section: -P2mentioning

confidence: 99%

Soft X-ray generation in cascade SASE FEL with two-frequency undulator

Zhukovsky

2017

EPL

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“…Для генерации столь коротковолнового когерентного излучения трудно найти подходящие для оптического резонатора материалы с хорошим коэффициентом отражения. В качестве источников излучения используют лазеры на свободных электронах (ЛСЭ) (см, например, [5][6][7][8][9][10]). Сама идея ЛСЭ была сформулирована Гинзбургом, который также предложил динамический ондулятор с движением электронного пучка в переменном во времени поле электромагнитной волны.…”

Section: Introductionunclassified

Генерация Мягкого Рентгеновского Излучения В Компактном Лазере На Свободных Электронах С Умножением Гармоник

Жуковский¹

2019

Журнал Технической Физики

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Single-pass free-electron lasers (FELs) with harmonic multiplication in the X-ray range are studied theoretically with the objective of producing intense radiation with the minimum possible FEL length, beam energy, and seed laser frequency. A cascade FEL with a two-frequency undulator for electron bunching at wavelengths of higher harmonics is proposed. The dynamics of radiation power in a FEL with harmonic multiplication cascades is investigated based on a well-proven phenomenological FEL model that covers all major losses for each harmonic in each FEL cascade. The effect of the beam quality on X-ray generation in a FEL is examined. It is demonstrated that electron beams with energy spread σ_ e ≤ 0.0002 are required for efficient use of harmonics in a cascade X-ray FEL. The evolution of power of harmonics in several cascade FELs at wavelengths of ~2–3 nm with multiplication of seed harmonics at a wavelength of 13.51 nm (Mo/Si reflection peak) and 11.43 nm (MoRu/Be reflection peak) is studied. It is demonstrated that the power increases to ~1 GW at a FEL length up to 40 m. In addition, the operation of multicascade FELs with a seed F _2 excimer 157-nm UV laser and harmonics of lasers with CO_2 and C_2H_2 at 30 nm with a beam of electrons with an energy of ~0.6 GeV and a current of ~1 kА is studied. The power of the modeled X-ray radiation of these FELs at λ = 2.5 and 3.3 nm increases to ~0.5 GW at ~30 m.

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Compact single-pass X-ray FEL with harmonic multiplication cascades

Zhukovsky

2018

Optics Communications

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The output of a laser amplifier with simultaneous amplified spontaneous emission and an injected seed

Cited by 7 publications

References 33 publications

Soft X-ray generation in cascade SASE FEL with two-frequency undulator

Soft X-ray generation in cascade SASE FEL with two-frequency undulator

Генерация Мягкого Рентгеновского Излучения В Компактном Лазере На Свободных Электронах С Умножением Гармоник

Compact single-pass X-ray FEL with harmonic multiplication cascades

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