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Q: Fachverband Quantenoptik und Photonik
Q 20: Ultrashort Laser Pulses and Biophotonics
Q 20.3: Vortrag
Dienstag, 10. März 2020, 14:30–14:45, f435
Characterization of sub-10 fs UV pulses using XPW dispersion scan — •Ayhan Tajalli1,2, Thomas Kalousdian3, Martin Kretschmar3, Sven Kleinert1,2, Uwe Morgner1,2,4, and Tamas Nagy3 — 1Institute of Quantum Optics, Leibniz Universität Hannover, Hannover, Germany — 2Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering-Innovation AcrossDisciplines), Hannover, Germany — 3Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Berlin, Germany — 4Laser Zentrum Hannover e.V., Hannover, Germany
The characterization of ultrashort UV pulses is a rather challenging task, as these pulses are extremely prone to material dispersion and space-time distortions. Moreover, the pulse characterization techniques in this spectral region should adapt another form of nonlinearity than second harmonic or sum frequency generation processes, as the frequency converted signal might lie in difficult spectral ranges. Consequently, the well-known characterization techniques such as FROG have successfully implemented degenerate four-wave mixing processes. However, these techniques suffer from rather bad signal to noise ratio and low sensitivity due to necessity of splitting the wave front. Here, the measurement of 8 fs Deep-UV pulses is performed using a dispersion scan (d-scan) device. We incorporate cross-polarized wave generation, as the nonlinear process. Since d-scan has a single-beam geometry, no beam splitting is necessary, which dramatically improves the sensitivity of the measurement. Accordingly, we can measure Deep-UV pulses with energy as low as 85 nJ with high fidelity.