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A high spatial coherence of phase‐matched high harmonic generation beam is produced from 30 fs pulses of a Ti:Sapphire laser in 55 Torr argon gas. A harmonic series up to 33rd order is obtained, and a spectrometer is used to measure the source spectrum that peaks at a wavelength of 30 nm. The spatial coherence of this source across spatial position of the beam profile for different choice of spatial...
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