High photon flux XUV and soft x-ray sources enabled by high harmonic generation of high power fiber lasers

Jan Rothhardt; Steffen Hädrich; Manuel Krebs; Jens Limpert; Andreas Tünnermann

doi:10.1117/12.2190419

17 July 2015 High photon flux XUV and soft x-ray sources enabled by high harmonic generation of high power fiber lasers

Jan Rothhardt, Steffen Hädrich, Manuel Krebs, Jens Limpert, Andreas Tünnermann

Proceedings Volume 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015); 95242O (2015) https://doi.org/10.1117/12.2190419
Event: International Conference on Optical and Photonic Engineering (icOPEN2015), 2015, Singapore, Singapore

Abstract

This contribution reports on the recent advances in high harmonic generation (HHG) with high power femtosecond fiber lasers at high repetition rates. The capabilities of high power fiber lasers, the challenges of phase matching in the tight-focusing regime and recent experimental results will be discussed. In particular, post compressed pules as short as 30 fs, with ~150 μJ pulse energy at 0.6 MHz repetition rate have been used for efficient HHG into the XUV. Despite the tight focusing phase matching is ensured by providing the target gas with adequately high density. A conversion efficiency in excess of 10^-6 at ~30 eV has been achieved in xenon gas. This resulted in more than 100μW of average power (>10¹³ photons per second), which represents the highest photon flux achieved by any HHG source in this spectral region so far. In addition, further pulse compression yielded few-cycle pulses at high average power that have enabled efficient soft Xray generation in neon and helium. HHG in neon provided more than 3·10⁹ photons/s within a 1% bandwidth at 120 eV and helium allowed for HHG up to the water window spectral region beyond 283 eV. These compact sources provide highest photon flux on a table-top and will enable exciting applications such as nanometer-resolution imaging or coincidence spectroscopy in the near future.

Citation Download Citation

Jan Rothhardt, Steffen Hädrich, Manuel Krebs, Jens Limpert, and Andreas Tünnermann "High photon flux XUV and soft x-ray sources enabled by high harmonic generation of high power fiber lasers", Proc. SPIE 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015), 95242O (17 July 2015); https://doi.org/10.1117/12.2190419

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KEYWORDS

Extreme ultraviolet

High harmonic generation

Mirrors

Neon

Optical fibers

Helium

Femtosecond fiber lasers

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