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Q: Fachverband Quantenoptik und Photonik

Q 39: Ultrashort Laser Pulses

Q 39.2: Vortrag

Mittwoch, 13. März 2019, 14:30–14:45, S SR 211 Maschb.

Kagome-fiber prism compressor combination for Yb:KGW laser pulse compression to sub-40fs — •Dennis Mayer¹, Christian T. Matthaei^1,2, Axel Heuer¹, and Markus Gühr¹ — ¹Institut für Physik und Astronomie, Universität Potsdam, 14476 Potsdam-Golm — ²Institut für physikalische und theoretische Chemie, Julius-Maximilians-Universität Würzburg, 97074 Würzburg

Spectral broadening in hollow core fibers is an important tool for pulse compression of low-peak power laser pulses, especially for Yb-based lasers. Here, we present a pulse compression scheme to reduce the pulse duration of a commercial Yb:KGW laser operating at 100 kHz repetition rate and 40 µJ pulse energy from 390 fs to 38 fs. The spectral braodening is accomplished using a krypton-filled Kagome-type fiber. We report broadened spectra for variable Kr-pressures and input powers. At optimal settings of 8 bar Kr-pressure and 3.3 W input power, the bandwidth of the pulse at the -10 dB level increased from 9.5 nm to 85 nm corresponding to a Fourier limit of 26 fs. A simple SF10 prism compressor is used to reduce the accumulated chirp and shortens the fiber output from about 500 fs to 38 fs. In addition to the spectral broadening, a pressure dependent change of the polarization is observed.