Fifth-harmonic production in neon and argon with picosecond 248-nm radiation

Rosman, R.; Gibson, George N.; Boyer, K.; Jara, Hernán; Luk, Ting Shan; McIntyre, I. A.; McPherson, A.; Solem, J. C.; Rhodes, C. K.

doi:10.1364/josab.5.001237

Cited by 36 publications

(13 citation statements)

References 13 publications

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“…This consideration was the motivation for the present study. Preliminary experiments have been performed by Li et al 17 with a 36-ps laser at 1.06 mm and by Rosman et al 18 for the fifth harmonic by means of a 1-ps laser at 248 nm. The present research extends these investigations by systematically studying the influence of the atomic density at different laser intensities on high-order harmonic generation.…”

Section: Introductionmentioning

confidence: 99%

Influence of atomic density in high-order harmonic generation

et al. 1996

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Influence of atomic density in high-order harmonic generationAltucci, C; Starczewski, Tomas; Mevel, E; Wahlström, Claes-Göran; Carre, B; Lhuillier, A Link to publication Citation for published version (APA): Altucci, C., Starczewski, T., Mevel, E., Wahlström, C-G., Carre, B., & L'Huillier, A. (1996). Influence of atomic density in high-order harmonic generation. Optical Society of America. Journal B: Optical Physics, 13(1), 148-156. DOI: 10.1364/JOSAB.13.000148General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal Take down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. We have investigated how high-order harmonics generated in rare gases depend on the atomic density. The peak and the profile of the atomic density in the interaction region were measured as a function of the backing pressure and the distance from the nozzle by a differential interferometry technique. The conversion efficiency for the harmonics in the plateau was found to increase approximately quadratically over the entire range of peak pressures investigated (3 -80 mbar). The intensity of the harmonics in the cutoff region, in contrast, increased only until an optimum peak pressure was reached, beyond which it decreased. This optimum peak pressure was found to be dependent on both the laser intensity and the process order. To understand this effect, we have performed extensive propagation calculations of both the fundamental and the harmonic fields, using ionization rates and dipole moments from a tunnel ionization model. We obtained good agreement with the experimental results. The observed effect is attributed to ionization-induced defocusing of the fundamental laser beam, which reduces the peak intensity obtained in the medium and shortens the extent of the plateau.

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Section: Introductionmentioning

confidence: 99%

Influence of atomic density in high-order harmonic generation

et al. 1996

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“…We compare the measurements with calculations in both the length gauge and the velocity gauge and show that the two gauges imply a different de Broglie wavelength. DOI High harmonic generation (HHG) is a process involving intense femtosecond laser light and gas-phase atoms or molecules [1][2][3]. It produces a coherent [4], collimated beam of extreme ultraviolet (xuv) radiation that is composed of a train of attosecond pulses.…”

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confidence: 99%

High Harmonic Generation and the Role of Atomic Orbital Wave Functions

et al. 2007

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Access and use of this website and the material on it are subject to the Terms and Conditions set forth at NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21276203&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21276203&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca.

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“…7 shows a partial energy level diagram for argon and the proposed six wave mixing scheme of Ref. It is possible that the larger f# focusing in the present experiment (f/25) favors VUV generation at a slightly different wavelength or that the phase matching conditions are different due to the higher intensities used in the present experiment High intensities can change the effective index of refraction (and hence phase matching) by creating more free electrons and by inducing an intensity dependent refractive index in the neutral gas [24]. In addition to 63 nm and 128 nm lines, XUV lines were observed in Ref [9] only emission centered near 127.3 nm was observed, which differs slightly from the 128 nm center wavelength reported in Ref.…”

Section: Six Wave Mixing In Argonmentioning

confidence: 76%

<title>Femtosecond vacuum ultraviolet (VUV) pulse characterization</title>

1995

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High power femtosecond pulses in the vacuum ultraviolet (VUV) have been generated through the nonlinear interaction of femtosecond KrF pulses with xenon and argon gas. In xenon, four wave mixing processes lead to VUV pulses at 147 nm and 108 urn with pulse energies in the 10 iJ range. In argon, a three photon resonance leads to third harmonic generation at 83 nm and microjoule level pulses near 127 nm generated by a six wave mixing process. To characterize the pulse width of the VUV pules at 147 nm and 83 am, techniques based on plasma-induced defocusing and spectral blue shifting are demonsirated.In the present experiments, four-and six-wave mixing processes in rare gases excited by a femtosecond KrF excimer laser pulse (248.5 nm) are used to generate megawatt VUV laser pulses. In 280 ISPIE Vol. 2377 0-8194-1724-6/95/$6.0O Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/17/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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Fifth-harmonic production in neon and argon with picosecond 248-nm radiation

Cited by 36 publications

References 13 publications

Influence of atomic density in high-order harmonic generation

Influence of atomic density in high-order harmonic generation

High Harmonic Generation and the Role of Atomic Orbital Wave Functions

<title>Femtosecond vacuum ultraviolet (VUV) pulse characterization</title>

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