Harmonic generation in a UV laser plasma

Földeş, I; Bakos, J.; Veres, G. I.; Bakonyi, Z.; Nagy, Tamás; Szatmàri, S.

doi:10.1109/2944.571779

Cited by 23 publications

(9 citation statements)

References 28 publications

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“…No variations in reflectivity of the fundamental radiation were observed in that case. The efficiency of 2ω harmonic generation steadily dropped for longer pulses, as was previously reported in [22,27]. At the same time, the 3ω/2 yield was insignificantly decreased in that case without specific peculiarities reported by Veisz et al [22], who observed a maximum of 3ω/2 radiation conversion efficiency at 350 fs range.…”

Section: Generation Of Backscattered 2ω and 3ω/2 Harmonics Of Femtosesupporting

confidence: 68%

X-ray Lasers, Plasma Properties and Harmonic Generation from Surfaces

Ganeev

2013

Laser - Surface Interactions

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In this chapter, the basic principles of surface-excited X-ray lasers are discussed. We demonstrate the achievements reported during studies of two laser systems, 13 nm Ag X-ray laser and 18.9 nm Mo X-ray laser. We show the methods for analysis of the plasma properties at strong laser-surface interactions. We demonstrate how laser plasmas generated by femtosecond radiation on the surface of boron and molybdenum targets are investigated by the shadowgraph method. The occurrence of plasma bullets is discussed, which were observed on both singlepulse and multi-pulse interaction with the same area of a target. Backscattered 2ω and 3ω/2 harmonics generation during the interaction of femtosecond radiation with the surfaces of various targets is analyzed. The efficient second and threehalved harmonics were achieved for low-Z targets, whereas only second-harmonic generation was observed for high-Z materials. Finally, we consider various peculiarities of harmonic generation from the surface interfaces during interaction with ultra-strong laser fields.Keywords X-ray lasers · Plasma for X-ray lasers · Harmonic generation from surfaces · 18.9 nm laser · Molybdenum laser · Surface plasma · High excitation shadowgraphs · Backscattered 2ω and 3ω/2 harmonics · Low-order harmonic generation · Laser chirp

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Section: Generation Of Backscattered 2ω and 3ω/2 Harmonics Of Femtosesupporting

confidence: 68%

X-ray Lasers, Plasma Properties and Harmonic Generation from Surfaces

Ganeev

2013

Laser - Surface Interactions

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“…Since it is expected that LDI plays a minor role on femtosecond timescales, linear theory should apply to even higher e-foldings than for long laser pulses until the instability saturates through, for example, wavebreaking. The deduced intensities using 0 ϭ135 fs are without saturation: (3.9Ϯ0.5)ϫ10 15 We calculated the collisional absorption of the incident laser pulse for propagation up to the 1/4n c and found that it is negligible, but ionization defocusing in the preplasma is significant for the fundamental. Refraction of the threehalves harmonic in 45°by the laser generated density profile is negligible due to the perpendicular propagation to the laser direction.…”

Section: ͑1͒mentioning

confidence: 99%

“…The second harmonic signal increases with shorter pulses, as found previously by others. 15 By contrast, the yield of the 3 0 /2 radiation has a maximum at (350Ϯ50) fs.…”

mentioning

confidence: 99%

Three-halves harmonic emission from femtosecond laser produced plasmas

et al. 2002

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“…Although this method is, in principle, limited by the ionization of the gas, this difficulty was overcome by applying ultrashort pulses~Chang et al, 1997;Spielmann et al, 1997!, thus reaching very short wavelength radiation up to 0.5 keV photon energy. Even a small, table-top KrF laser with nonrelativistic intensity generated harmonics to the wavelength of 82.8 nm Földes et al, 1996!. In this article, some aspects of high-harmonics generation are summarized, especially with the aim of showing the differences among results obtained with lasers of different parameters, that is, wavelength and pulse duration. As early as 1980, high harmonics were obtained from laserplasma interactions with IR laser beams.…”

Section: Introductionmentioning

confidence: 99%

Generation of high harmonics in laser plasmas

et al. 2003

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The generation of high harmonics in laser-plasma interactions on the steep density gradients is discussed, especially by using short-pulse UV laser radiation. Low intensity experiments with 5{10 15 W0cm 2 generate harmonics in the VUV range, and the efficiency can be optimized by modifying the density gradient. To obtain higher harmonics and to clear some disagreements among different results concerning polarization properties of harmonics we switched for higher intensities. Our experimental arrangement makes it possible to obtain a 5{10 17 W0cm 2 intensity with a prepulse as low as 10 7 W0cm 2 using a table-top system. Preliminary results and future trends for high-harmonics generation with this method are given.

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Harmonic generation in a UV laser plasma

Cited by 23 publications

References 28 publications

X-ray Lasers, Plasma Properties and Harmonic Generation from Surfaces

X-ray Lasers, Plasma Properties and Harmonic Generation from Surfaces

Three-halves harmonic emission from femtosecond laser produced plasmas

Generation of high harmonics in laser plasmas

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