Journal
APPLIED OPTICS
Volume 51, Issue 18, Pages 4240-4245Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.51.004240
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Highly coherent extreme ultraviolet radiation around the water window region (similar to 4.4 nm) is generated in a semi-infinitive helium gas cell using infrared pulses of wavelength 1300 nm, energy 2.5 mJ, duration 40 fs, and repetition rate 1 kHz. The pressure-squared dependence of the intensity and the almost-perfect Gaussian profile and low divergence of the high harmonic source indicate a phase-matched generation process. The spatial coherence of the source is studied using Young's double-slit measurements. (C) 2012 Optical Society of America
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