3/2 harmonic generation by femtosecond laser pulses in steep-gradient plasmas

Tarasevitch, A.; Dietrich, C.; Blome, C.; Sokolowski‐Tinten, K.; Linde, D. von der

doi:10.1103/physreve.68.026410

Cited by 28 publications

(23 citation statements)

References 19 publications

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“…With this intensity, a much shorter density scale length was enough for observing three-halves harmonic emission. Similar results were previously achieved by Tarasevitch et al, 23 who observed 3x/2 emission at extremely short plasma scale lengths (L % k 0 ) for a peak intensity of 7Á10 17 W/cm 2 . In this case, the excited plasma waves had a very broad spectrum and the 3x/2 emission was highly collimated.…”

Section: Introductionsupporting

confidence: 91%

“…A distinctive feature of these studies was the directionality of the X-ray emission, which was found to be strictly correlated to the directionality of the 3x/2 emission. 22,23 The latter was proven to be maximum in the plane of incidence for P-polarization and in the perpendicular plane for S-polarization. 12,22 Non-isotropic distribution of the X-ray yield was further investigated by different authors.…”

Section: Introductionmentioning

confidence: 92%

“…Chen et al 17 reported the angular distribution of the hot electrons, but at intensities from 10 17 to 10 19 W/cm 2 and pulse duration from 70 to 400 fs. Other authors 22,23 reported detailed measurements of the angular distribution of 3x/2 radiation. Soom et al 15 mentioned a strong polarization dependence of the X-ray emission.…”

Section: Introductionmentioning

confidence: 99%

“…This requirement basically remains valid with ultra-short and ultra-intense pulses, but the higher laser intensities generally result in a significant reduction of the scale length needed for the growth of the TPD instability. [22][23][24][25] The formation of a pre-plasma can provide, before of the arrival of the main pulse, a scale length suitable for stimulated instabilities to grow. Veisz et al 26 reported the first measurements of 3x/2 emission in a long density scale-length plasma (L % 100/200 k 0 ) in the ultra-short pulse regime (100 fs).…”

Section: Introductionmentioning

confidence: 99%

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X-ray conversion of ultra-short laser pulses on a solid sample: Role of electron waves excited in the pre-plasma

et al. 2014

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Flat silicon samples were irradiated with 40 fs, 800 nm laser pulses at an intensity at the best focus of 2·1018 Wcm−2, in the presence of a pre-plasma on the sample surface. X-ray emission in the spectral range from 2 to 30 keV was detected inside and outside the plane of incidence, while varying pre-plasma scale length, laser intensity, and polarization. The simultaneous detection of 2ω and 3ω/2 emission allowed the contributions to the X-ray yield to be identified as originating from laser interaction with either the near-critical density (nc) region or with the nc/4 region. In the presence of a moderate pre-plasma, our measurements reveal that, provided the pre-plasma reaches a scale-length of a few laser wavelengths, X-ray emission is dominated by the contribution from the interaction with the under dense plasma, where electron plasma waves can grow, via laser stimulated instabilities, and, in turn, accelerate free electrons to high energies. This mechanism leads also to a clear anisotropy in the angular distribution of the X-ray emission. Our findings can lead to an enhancement of the conversion efficiency of ultra short laser pulses into X-rays.

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Section: Introductionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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X-ray conversion of ultra-short laser pulses on a solid sample: Role of electron waves excited in the pre-plasma

et al. 2014

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“…The 3/2ω radiation is generated as a result of stimulated Raman scattering by one of these plasmons. The instability threshold is determined by the density scale length [7]. On the other hand, the 2ω radiation is produced by electron plasma wave coupling at the critical density surface of the plasma.…”

Section: Introductionmentioning

confidence: 99%

Study of 2ω and 3/2ω harmonics in ultrashort high-intensity laser plasma interaction

et al. 2010

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An experimental study is presented on measurements of optical spectrum of the laser light scattered from solid surface irradiated by Ti:sapphire laser pulses up to an intensity of 1.2 × 10 18 W cm −2 . The spectrum has well-defined peaks at wavelengths corresponding to 2ω and 3/2ω radiations. The spectral features vary with the laser intensity and show blue-shift with increasing laser intensity. At a constant laser fluence, the spectrum is red-shifted with increasing laser pulse duration. The observed results are explained in terms of the density scale length variation of the plasma and laser chirp.

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