期刊
OPTICS EXPRESS
卷 22, 期 5, 页码 6194-6202出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.22.006194
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资金
- DARPA PULSE program
- DOE AMOS grant
- Samsung
- DOE SBIR program at KMlabs [SC0007469, DE-SC0006514]
- Div Of Engineering Education and Centers
- Directorate For Engineering [1347407] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-SC0006514] Funding Source: U.S. Department of Energy (DOE)
We demonstrate the highest flux tabletop source of coherent soft X-rays to date, driven by a single-stage 10 mJ Ti:sapphire regenerative amplifier at 1 kHz. We first down-convert the laser to 1.3 mu m using a parametric amplifier, before up-converting it to soft X-rays using high harmonic generation in a high-pressure, phase matched, hollow waveguide geometry. The resulting optimally phase matched broadband spectrum extends to 200 eV, with a soft X-ray photon flux of > 10(6) photons/pulse/1% bandwidth at 1 kHz, corresponding to > 10(9) photons/s/1% bandwidth, or approximately a three order-of-magnitude increase compared with past work. Finally, using this broad bandwidth X-ray source, we demonstrate X-ray absorption spectroscopy of multiple elements and transitions in molecules in a single spectrum, with a spectral resolution of 0.25 eV, and with the ability to resolve the near edge fine structure. (C) 2014 Optical Society of America
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