Abstract
An easy and reliable way is presented to measure the duration of UV femtosecond laser pulses of λ < 200 nm. The used autocorrelation techniques are based on two-photon absorption (TPA) in different TPA media, especially calcium fluoride (CaF2). For 197 nm, the laser-pulse energy transmission and the laser-induced fluorescence of self-trapped excitons at 278 nm are applied. Both methods yield nearly the same second-order autocorrelation functions allowing to analyze the investigated laser pulse and obtain its duration of \((350\pm10)\) fs.
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Acknowledgments
The authors like to thank Schott AG for providing the CaF2 and fused silica samples. The authors acknowledge scientific and technical assistance by F. Garwe, Ch. Mühlig and M. Franke. Funding of this work by the Free State of Thuringia is gratefully acknowledged.
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Heisel, PC., Bergmann, J., Paa, W. et al. 197 nm femtosecond laser-pulse duration: comparison of autocorrelation measurements. Appl. Phys. B 112, 49–53 (2013). https://doi.org/10.1007/s00340-013-5395-4
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DOI: https://doi.org/10.1007/s00340-013-5395-4