Hannover 2003 – scientific programme

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MO: Molekülphysik

MO 7: Femtosekundenspektroskopie: Pulsanalyse und ultraschnelle IR-Spektroskopie (gemeinsame Sitzung mit FV Q)

MO 7.2: Talk

Thursday, March 27, 2003, 11:15–11:30, B 302

Dispersion free spectral phase interferometry: full characterization of ultrashort visible and UV pulses — •Peter Baum, Stefan Lochbrunner, and Eberhard Riedle — LS für BioMolekulare Optik, Sektion Physik, Ludwig-Maxilimians-Universität München

Widely tunable visible pulses with durations down to 10 fs are readily generated from a NOPA [1] and by frequency doubling similarly short UV pulses can be obtained. To fully characterize these pulses without introducing extra pulse lengthening, we present a dispersion free variant of the conventional SPIDER [2]. Two chirped and temporally delayed 775 nm fundamental pulses are overlapped with the test pulses in such a way that the test pulses pass no dispersive material. For the analysis of extremely short UV pulses at 293 nm a 62 µm thick BBO crystal is used to generate pulses at the visible difference frequency. For visible pulses we use sum frequency mix in 25 to 50 µm thick BBO crystals. The two resulting pulses that are temporally delayed and frequency shifted are brought to interference in a high resolution spectrometer. From the interferogram the spectral phase and the pulse duration can be determined at about 10 Hz update rate. It is important to notice that the measurement is performed at the focus of a possible spectroscopic experiment and therefore yields the pulse characterization at the point of greatest interest.

[1] E. Riedle, M. Beutter, S. Lochbrunner, J. Piel, S. Spörlein, W. Zinth, Appl. Phys. B 71, 457 (2000)

[2] C. Iaconis, I. A. Walmsley, Optics Letters 23, 792 (1998)