caa a22 4500 445370211 CHVBK 20180317142944.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s00340-011-4683-0 doi (NATIONALLICENCE)springer-10.1007/s00340-011-4683-0 Convenient pulse length measurement of sub-20-fs pulses down to the deep UV via two-photon absorption in bulk material [Elektronische Daten] [C. Homann, N. Krebs, E. Riedle] The beam attenuation by two-photon absorption in thin crystals and glass plates is utilized for directly measuring the intensity autocorrelation of UV femtosecond pulses without the need for an auxiliary pulse. We give a full description of the newly developed setup for operation from the blue down to the deep UV. The conditions that must be met to achieve reliable measurements are investigated. The choice of the two-photon-absorbing material governs the attainable wavelength range, the material thickness determines the shortest pulse that can be reliably characterized and high intensities influence the derived pulse duration due to saturation effects. The performance of the UV autocorrelator is demonstrated for pulses with durations below 20fs, with energies of 3nJ and with central wavelengths from the visible down to 195nm. 2-Hz update rates are achieved at the 1-kHz repetition rate of the laser. The wavelength dependence of the two-photon-absorption coefficient of BBO is determined by z-scan measurements and we find that it decreases much faster at longer wavelengths than is expected from the linear absorption spectrum. Springer-Verlag, 2011 Homann C. Lehrstuhl für BioMolekulare Optik, Ludwig-Maximilians-Universität (LMU), Oettingenstraße 67, 80538, München, Germany aut Krebs N. Lehrstuhl für BioMolekulare Optik, Ludwig-Maximilians-Universität (LMU), Oettingenstraße 67, 80538, München, Germany aut Riedle E. Lehrstuhl für BioMolekulare Optik, Ludwig-Maximilians-Universität (LMU), Oettingenstraße 67, 80538, München, Germany aut Applied Physics B Springer-Verlag 104/4(2011-09-01), 783-791 0946-2171 104:4<783 2011 104 340 https://doi.org/10.1007/s00340-011-4683-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00340-011-4683-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Homann C. Lehrstuhl für BioMolekulare Optik, Ludwig-Maximilians-Universität (LMU), Oettingenstraße 67, 80538, München, Germany aut NATIONALLICENCE 700 1- Krebs N. Lehrstuhl für BioMolekulare Optik, Ludwig-Maximilians-Universität (LMU), Oettingenstraße 67, 80538, München, Germany aut NATIONALLICENCE 700 1- Riedle E. Lehrstuhl für BioMolekulare Optik, Ludwig-Maximilians-Universität (LMU), Oettingenstraße 67, 80538, München, Germany aut NATIONALLICENCE 773 0- Applied Physics B Springer-Verlag 104/4(2011-09-01), 783-791 0946-2171 104:4<783 2011 104 340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer