Analysis of efficient generation and spatial intensity profiles of high-order harmonic beams produced at high repetition rate

Year: 1998

Authors: De Lisio C., Altucci C., Beneduce C., Bruzzese R., De Filippo F., Solimeno S., Bellini M., Tozzi A., Tondello G., Pace E.

Autors Affiliation: Dipartimento di Scienze Fisiche, Univ. di Napoli Federico II, Ist. Naz. di Fisica Della Materia, Padiglione 20, Mostra d\’Oltremare, 80125 Naples, Italy; Europ. Lab. for Nonlinear Spectrosc., Largo E. Fermi, 2, 50125 Florence, Italy; Dipto. di Elettronica ed Informatica, Universitá di Padova, Via Gradenigo 6/A, 35131 Padova, Italy; Dipto. Astronomia Sci. dello Spazio, Universitá di Firenze, Largo E. Fermi, 5, 50125 Florence, Italy

Abstract: We report in this paper an experimental study of the spatial profile of harmonic beams (up to the 23rd order) generated in argon with 100 fs titanium-sapphire laser pulses at high repetition rate. In particular, we have investigated high-order harmonic radiation features as a function of the gas target position with respect to the pump laser focus. We have, thus, obtained the experimental conditions that simultaneously optimize generation efficiency and divergence angles of the harmonic beams. As a general trend, both the laser intensity and the harmonic order affect the harmonic beam divergence and spatial profile, depending on whether the harmonics lie in the plateau or in the cutoff region. Finally, we discuss our results in the light of recent theoretical analyses of the process.

Journal/Review: OPTICS COMMUNICATIONS (PRINT)

Volume: 146 (1-6)      Pages from: 316  to: 324

More Information: ERB FMGE CT 950017. – The work of M.B. and A.T. was supported by the European Community under contract ERB FMGE CT 950017.
KeyWords: Argon; Harmonic analysis; Laser pulses; Pumping (laser); Titanium alloys, Harmonic beams, Harmonic generation
DOI: 10.1016/S0030-4018(97)00538-5