Generation of sub-50-fs vacuum ultraviolet pulses by four-wave mixing in argon

Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy, Max-Born-Strasse 2a, 12489 Berlin, Germany.
Optics Letters (Impact Factor: 3.29). 05/2010; 35(9):1491-3. DOI: 10.1364/OL.35.001491
Source: PubMed


We report on the generation of femtosecond pulses at 160 nm with energies up to 240 nJ at 1 kHz repetition rate and sub-50-fs pulse duration. This pulse energy is a 1-order-of-magnitude improvement compared with previous sub-100-fs sources in this wavelength range. The pulses are generated by four-wave difference-frequency mixing process between the fundamental of a Ti:sapphire laser and its third harmonic in argon. Pulse duration measurements are achieved by pump-probe ionization of Xe gas providing the cross correlation between the fifth harmonic and the fundamental.

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Available from: Marcus Beutler, Jul 24, 2015
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    • "Existing spatially coherent sources in the VUV region include large-scale synchrotrons and free-electron lasers, or inefficient, and often elaborate, discrete frequency-conversion systems. Examples include second harmonic generation in exotic crystals, such as SrB 4 O 7 [12], third harmonic generation [13], and four-wave mixing [8] [14] in gases. These techniques usually produce VUV radiation with a narrow relative frequency bandwidth and cannot be used to generate coherent subfemtosecond pulses for the applications described above. "
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