Abstract

Nearly transform-limited femtosecond pulses have been generated between 585 and 620 nm by simultaneous narrow-band seeding at 1.053 μm of an optical parametric amplifier pumped by a tunable high-power Ti:sapphire laser system at 1 kHz and sum-frequency mixing between the resulting idler and the pump pulses in the same nonlinear crystal.

© 1995 Optical Society of America

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References

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    [CrossRef]
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1995

1994

Brun, A.

J. Watson, T. Lepine, P. Georges, A. Brun, in Ultrafast Phenomena IX, P. F. Barbara, W. H. Knox, G. A. Mourou, A. H. Zewail, eds., Vol. 60 of Springer Series in Chemical Physics (Springer-Verlag, Berlin, 1994), pp. 178–179; F. Salin, F. Estable, F. Saviot, op. cit., pp. 194–195.
[CrossRef]

Georges, P.

J. Watson, T. Lepine, P. Georges, A. Brun, in Ultrafast Phenomena IX, P. F. Barbara, W. H. Knox, G. A. Mourou, A. H. Zewail, eds., Vol. 60 of Springer Series in Chemical Physics (Springer-Verlag, Berlin, 1994), pp. 178–179; F. Salin, F. Estable, F. Saviot, op. cit., pp. 194–195.
[CrossRef]

Greenfield, S. R.

Kohler, B.

Lepine, T.

J. Watson, T. Lepine, P. Georges, A. Brun, in Ultrafast Phenomena IX, P. F. Barbara, W. H. Knox, G. A. Mourou, A. H. Zewail, eds., Vol. 60 of Springer Series in Chemical Physics (Springer-Verlag, Berlin, 1994), pp. 178–179; F. Salin, F. Estable, F. Saviot, op. cit., pp. 194–195.
[CrossRef]

Negus, D.

Noack, F.

Petrov, V.

Reed, M. K.

Seifert, F.

Steiner-Shepard, M. K.

Wasielewski, M. R.

Watson, J.

J. Watson, T. Lepine, P. Georges, A. Brun, in Ultrafast Phenomena IX, P. F. Barbara, W. H. Knox, G. A. Mourou, A. H. Zewail, eds., Vol. 60 of Springer Series in Chemical Physics (Springer-Verlag, Berlin, 1994), pp. 178–179; F. Salin, F. Estable, F. Saviot, op. cit., pp. 194–195.
[CrossRef]

Wilson, K. R.

Yakovlev, V. V.

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Figures (4)

Fig. 1
Fig. 1

(a) Phase-matching angle θ and (b) GVM for an OPA and SFG with BBO. Both processes are type oo-e, and in both cases only the significant GVM parameter Δpi = 1/vp − 1/vi is plotted, where vp and vi are the pump and the idler group velocities, respectively. The lower tunability limit is set by the pump system, and the upper by the transparency cutoff of BBO.

Fig. 2
Fig. 2

Experimental setup: L1–L4, lenses; BS1–BS3, beam splitters; F, filters; DM, dichroic mirror; PR, polarization rotator. The commercial Ti:sapphire regenerative amplifier (Quantronix Model 4810/20 RGA) is pumped by the second harmonic of the Q-switched Nd:YLF laser and provides ≥0.3-mJ pulse energies at 1-kHz repetition rate. The BBO nonlinear crystal is positioned before the focus of L3.

Fig. 3
Fig. 3

Recorded spectra demonstrating the achieved tunability with the OPA SFG wavelength shifter. In all cases the pulse-length–bandwidth product does not exceed 0.5, a value typical for the pump pulses.

Fig. 4
Fig. 4

Autocorrelation traces of the visible pulses at 605 nm obtained through noncollinear second-harmonic generation in an additional 1-mm-thick BBO crystal. In (a) the OPA pump level is 70 GW/cm2, and in (b) it is 47 GW/cm2. Assuming Gaussian pulse shapes, the estimated FWHM is (a) 130 fs and (b) 88 fs.

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