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Q: Fachverband Quantenoptik und Photonik

Q 37: Ultrashort Laser Pulses

Q 37.3: Vortrag

Mittwoch, 11. März 2020, 14:30–14:45, f435

Polarization gauge for few-cycle high intensity laser pulses — •Marius te Poel, Michael Stumpf, Julian Wegner, and Georg Pretzler — Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf

We present a gauge which allows for precise measurements of the polarization in lasers with ultrashort pulses and high power. Standard polarizers either tend to bleach out or are not selective enough in the required near-infrared range, and most of all, many of the employed effects are too wavelength-sensitive concerning the broad spectra of ultrashort pulse lasers. We present a new type of broadband polarization gauge which is based on Brewster-angle reflection at a fused silica mirror. This effect turns out to be almost constant over a bandwidth from 600 to 1000 nm. The device can be tuned to different wavelength ranges by adjusting the reflection angle and was used for detecting the exact direction of linearly polarization as well as the main axis of elliptically polarized light. We present the setup and characterization data of the PHASER sub-10-fs Ti:Sa-laser system in Düsseldorf. Furthermore, we discuss and present applications of the device.