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O: Fachverband Oberflächenphysik

O 45: Poster Tuesday: Ultrafast Processes

O 45.3: Poster

Dienstag, 2. April 2019, 18:00–20:00, Poster D

Development of a sub 50 fs mid-infrared laser source using the principle of OPCPA — •Manuel Bridger, Oscar Naranjo, Alexander Tarasevitch, and Uwe Bovensiepen — Universität Duisburg-Essen, Fakultät für Physik, 47057 Duisburg, Germany

For many different experiments to measure the lattice modes or molecular vibrations, it is essential to have an ultrashort laser pulse with a wavelength which is in resonance with such processes, namely in the mid infrared (MIR) range. Additionally it has been shown that the cutoff frequency of high harmonics can be increased into the keV X-ray range using longer wavelengths, which will be our central application for the MIR light [1].

We will present the development of a high peak power two step Optical Parametric Chirped Pulse Amplifier (OPCPA). With this procedure, it is possible to switch the wavelength from the visible range towards the MIR by simultaneously increasing the pulse energy by several orders of magnitude.

We start out with a Ti:sapphire oscillator yielding an octave-spanning spectrum around 800 nm, which is first stretched from 6 fs to 6 ps. Within two subsequent steps consisting of amplification using an OPA stage and wavelength switching within a DFG stage, we reach 3200 nm central wavelength with a bandwidth supporting sub 50 fs and a pulse energy of >500 μJ. This work is funded by the DFG through SFB 1242, TP A05.

[1] T. Popmintchev et al., Science 336, 1287-1291 (2012).