Pressure optimization and phase matching of high harmonics generation in CO2 and C2H2 molecular gases

Sayrac, M.; Kolomenskii, A.A.; Schuessler, H. A.

doi:10.1016/j.elspec.2018.08.003

Cited by 16 publications

(11 citation statements)

References 49 publications

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“…The seed light for a FEL can be also produced by high-order harmonic generation in a gas, covering wavelengths from the ultraviolet to soft X-rays (see, for example, ref. [37]); the experimental demonstration to it was given, for example, in ref. [38].…”

Section: Introductionmentioning

confidence: 99%

“…Compliant with the FEL theory (see refs. [14][15][16][17][18][19][20]23,[32][33][34][35][36][37][38][39][40][49][50][51]), and based on the numerical simulations in refs. [26,[63][64][65] and on the comparison with a number of FEL experiments at various installations, the following formula was worked out for the description of the induced harmonic power evolution by two terms: [104] Q n (z) ≅ Pn,0 e n z∕L g…”

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confidence: 99%

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Theoretical Analysis of the Radiation Properties of Some Major X‐Ray Free Electron Lasers

Zhukovsky

2021

Annalen der Physik

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A theoretical analysis of the radiation in X-ray free electron lasers (FELs) LCLS, PAL-XFEL, SwissFEL, as well as SACLA, FLASH 2, and European XFEL is presented. Major losses in FELs are analytically accounted for and analyzed, using exact expressions for the Bessel factors in terms of the generalized Bessel functions. This allows distinguishing the contributions of key parameters and accounting for the losses individually for each harmonic, considering higher sensitivity of the electron-photon interaction at higher harmonic wavelengths. The harmonic power evolution along FELs and the spectral width of the radiation lines is studied. The theoretical results are analyzed and are compared with the available experimental data for the FEL experiments. The harmonic generation and amplification in the FELs are modeled and studied with the harmonic lasing self-seed (HLSS) with separate buncher and radiator, and the results are compared with those for SASE. The spectral properties of the radiation are analytically calculated and compared with the measured spectral characteristics. The advantages of HLSS versus SASE FEL are elucidated in the examples of FLASH2, European XFEL, and SwissFEL. The prospected radiation properties of LCLS-II FEL are analyzed and the possibilities of using harmonics in this FEL are proposed.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Theoretical Analysis of the Radiation Properties of Some Major X‐Ray Free Electron Lasers

Zhukovsky

2021

Annalen der Physik

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“…High harmonic orders are obtained from 17 th harmonic to 35 th harmonic (corresponding wavelength from ~47nm to ~23nm). The harmonic energy per optical pulse is expected a nanojoule range, and this range corresponds to harmonic power of ~3kW (Sayrac et al, 2018). This high order harmonic radiation can be used for seeding high harmonic generation source in free electron lasers (FEL) (Lambert et al, 2008;Zhukovsky, 2018).…”

Section: Methodsmentioning

confidence: 98%

“…There are many approaches studied to increase the efficiency of harmonic light source. For instance, high harmonic generation in gas mixture , the role of the shape of the optical field (Bartels et al, 2000), controlling of the electron trajectories in the optical field (Salières et al, 2001), the pressure optimization of high harmonic generation Sayrac et al, 2018;Sayrac et al, 2019), generation of even harmonics of the fundamental radiation in two-color laser fields (Sayrac et al, 2019), and the effect of an increasing laser intensity (Gibson et al, 2004). These studies aimed to improve the generation efficiency of coherent XUV radiation.…”

Section: Introductionmentioning

confidence: 99%

High Harmonic Generation in Ar and N2 Gas Mixture Using Ultrashort High Power Laser System

Sayrac

2020

Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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High harmonic generation (HHG) has been accepted as a tool for tabletop based generation of light source in the XUV and soft x ray region. HHG can produce coherent optical pulses having pulse duration in the femtosecond or even attosecond time region. In this paper, generation of high harmonics are produced by using high power laser system having optical pulses at 6mj pulse energy with pulse duration of 50fs at 10Hz repetition rate. High harmonics in pure Ar, N2 and mixture of the Ar-N2 are used as a generation medium to produce high harmonics. The harmonic signal is increased or decreased depending on the experimental condition. Harmonic yield produced in Ar is stronger than harmonic yield produced in N2 gas. Generation of high order harmonics are observed up to 35H (~54eV corresponding photon energy), and harmonic order from N2 gas is 33H. The mixture of two gas species cause to enhancement of 35H order, which is weakly observed in pure N2 gas. The mechanism of high harmonic generation is explained that strong harmonic signal generated in pure Ar gas helps increase the ionization rate of N2 gas. Thus, the harmonic signal in Ar-N2 is boosted compared the harmonic signal produced in pure N2. The enhancement factor of harmonic yield is from ~2 to 5 for per harmonic order.

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“…Излучение ЛСЭ с ССИ имеет хорошую пространственную структуру и большую мощность, но слабую временную когерентность. В отсутствие готовых затравочных лазеров на высокой частоте можно использовать самозатравочные ЛСЭ [51,52] или высшие гармоники, сгенерированные в лазерах с молекулами F 2 , CO 2 , C 2 H 2 [53].…”

Section: лсэ с умножением высших гармоник в нанометровом диапазонеunclassified

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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Pressure optimization and phase matching of high harmonics generation in CO2 and C2H2 molecular gases

Cited by 16 publications

References 49 publications

Theoretical Analysis of the Radiation Properties of Some Major X‐Ray Free Electron Lasers

Theoretical Analysis of the Radiation Properties of Some Major X‐Ray Free Electron Lasers

High Harmonic Generation in Ar and N2 Gas Mixture Using Ultrashort High Power Laser System

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

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