Fiber amplifiers for gravitational wave detectors : temporal dynamics and coherent beam combining

[no abstract

Media 1: Self-focusing in multicore fibers

Originally published in Optics Express on 09 February 2015 (oe-23-3-2436

Media 2: Self-focusing in multicore fibers

Originally published in Optics Express on 09 February 2015 (oe-23-3-2436

Temporal quality of post-compressed pulses at large compression factors

Post-compression of ultra-short laser pulses via self-phase modulation is routinely employed for the generation of laser pulses with optical bandwidths reaching far beyond the laser gain limitations. While high compression factors can be routinely achieved, the compressed pulses typically suffer from temporal quality degradation. We numerically and experimentally analyze the deterioration of different measures of temporal quality with increasing compression factor and show how appropriate dispersion management and cascading of the post-compression process can be employed to limit the impact of this effect. The demonstrated saturation of pulse quality degradation at large compression factors puts novel femtosecond laser architectures based on post-compressed pico- or even nanosecond laser systems in sight

Wavelength shifting concept for high-power femtosecond lasers

We introduce a new concept to frequency shift a high-power laser using a waveshaper and a multi pass cell. We demonstrate this concept by experimentally frequency shifting a 200 fs laser from 1030 nm to 1000 nm

Photocathode Laser based on a 3 GHz Electro-Optical Comb Generator for the Ultrafast Electron Diffraction Facility REGAE

We present recent results on laser system that is going to be used as a photocathode laser at the REGAE UEDfacility [1] at DESY. One challenge for UED is the so-called space charge, which occurs due to the mutualrepulsion of the electrons and which limits the coherence length and the achievable spatial resolution required forbiological samples. Our approach to overcome this issue is to distribute the 100 fC charge required to generatesufficient diffraction signal to a burst of about 4500 electron bunches, each containing only about 140 electrons