Frequency doubling of multi-terawatt femtosecond pulses

We present an experimental and theoretical study of the influence of the spatial beam quality (fluence and phase distributions) on the second-harmonic generation in KDP crystals pumped by 180-fs pulses at 790 nm. Conversion efficiency and beam focusability are investigated experimentally and theoret...

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Veröffentlicht in:	Applied physics. B, Lasers and optics Lasers and optics, 2004-09, Vol.79 (5), p.547-554
Hauptverfasser:	MARCINKEVICIUS, A, TOMMASINI, R, TSAKIRIS, G. D, WITTE, K. J, GAIZAUSKAS, E, TEUBNER, U
Format:	Artikel
Sprache:	eng
Schlagworte:	Beam characteristics: profile, intensity, and power spatial pattern formation Beams (radiation) Conversion Diffraction Dispersions Exact sciences and technology Femtosecond pulses Frequency conversion harmonic generation, including high-order harmonic generation Frequency doubling Fundamental areas of phenomenology (including applications) Laser optical systems: design and operation Lasers Nonlinear optics Optics Phase distribution Physics Ultrafast processes optical pulse generation and pulse compression
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Beschreibung
Zusammenfassung:	We present an experimental and theoretical study of the influence of the spatial beam quality (fluence and phase distributions) on the second-harmonic generation in KDP crystals pumped by 180-fs pulses at 790 nm. Conversion efficiency and beam focusability are investigated experimentally and theoretically by the numerical analysis of the second harmonic, considering effects due to the cubic nonlinearity, beam diffraction, group-velocity walk-off, and dispersion of the pulses. It was found that the uniform intensity and phase distributions of the fundamental beam are essential to obtain a high focal intensity of the second-harmonic beam.
ISSN:	0946-2171 1432-0649
DOI:	10.1007/s00340-004-1612-5