Mainz 2017 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 49: Ultrashort Laser Pulses: Generation and Applications
Q 49.7: Talk
Thursday, March 9, 2017, 16:00–16:15, P 5
Ultrashort pulsed compact 2050 nm fiber laser accelerating electrons at a dielectric structure — Heinar Hoogland1,2, Joshua McNeur2, Martin Kozák2, •Peter Hommelhoff2, and Ronald Holzwarth1 — 1Menlo Systems GmbH, Am Klopferspitz 19a, 82152 Martinsried, Germany — 2Lehrstuhl für Laserphysik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstraße 1, 91058 Erlangen, Germany
A robust all-polarization maintaining fiber laser system at 2050 nm emitting femtosecond pulses at 1-MW peak power level is studied for subsequent dielectric laser acceleration of non-relativistic electrons. The laser setup consists of a Thulium/Holmium codoped gain fiber based oscillator in figure-9 design and a pulse picked chirped pulse two-stage amplifier arrangement. Both temporal stretching as well as recompression of the 2050 nm pulses are achieved by exploiting a single chirped volume Bragg grating, circumventing a bulky diffraction grating based temporal pulse management solution that is highly prone to mechanical perturbations. The laser emits strictly linear polarized pulses at 370-fs pulse duration and 570 nJ pulse energy. By applying this compact fiber laser architecture to a table-top sized "teeny-tiny" accelerator device based on a single Silicon nanograting, 25-keV electrons are accelerated by gradients up to 53 MeV/m. The overall compactness of the entire experimental stage allows for drastically reduced electron accelerator dimensions over traditional large-scale radio-frequency linear accelerator arrangements.