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Q: Fachverband Quantenoptik und Photonik

Q 37: Ultrashort Laser Pulses

Q 37.4: Vortrag

Mittwoch, 11. März 2020, 14:45–15:00, f435

A dispersion-free Attenuator for Ultra-short Laser Pulses — •Julia Kunzelmann, Julian Wegner, and Georg Pretzler — Institut für Laser- und Plasmaphysik, Heinrich Heine Universität Düsseldorf

Lasers play an important role in technology and science. For many applications, the power and intensity must be accurately adjusted. With few-cycle laser pulses, a main challenge consists in varying the laser pulse intensity without changing any other parameter, like the temporal pulse shape or the focus spot size. We developed a new fully reflective pulse attenuator which is based upon properly shaped thin metal layers. This decreases the pulse energy by several orders of magnitude in many fine steps while keeping the other parameters constant.

We present the setup of our device together with simulations of the reflective layers and various measurements which show that other parameters are not affected. Furthermore, a few examples are given in which the new attenuator has been applied fruitfully in laser-matter interaction experiments.