Journal
OPTICS EXPRESS
Volume 26, Issue 15, Pages 19318-19327Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.26.019318
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Funding
- Federal State of Thuringia [2015 FGR 0094]
- European Social Fund (ESF)
- German Ministry of Education and Research (BMBF) [05P15SJFFA]
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Separation of the high average power driving laser beam from the generated XUV to soft-X-ray radiation poses great challenges in collinear HHG setups due to the losses and the limited power handling capabilities of the typically used separating optics. This paper demonstrates the potential of driving HHG with annular beams, which allow for a straightforward and power scalable separation via a simple pinhole, resulting in a measured driving laser suppression of 5.10(-3). The approach is characterized by an enormous flexibility as it can be applied to a broad range of input parameters and generated photon energies. Phase matching aspects are analyzed in detail and an HHG conversion efficiency that is only 27% lower than using a Gaussian beam under identical conditions is demonstrated, revealing the viability of the annular beam approach for high flux coherent short-wavelength sources and high average power driving lasers. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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