title: Spatially coherent, phase matched, high-order harmonic EUV beams at 50 kHz.
abstract: By focusing a high repetition rate (50 kHz), compact, femtosecond laser system with low pulse energy (25 muJ) using a tight-focusing geometry, we demonstrate fully phase matched high-order harmonic generation for the first time at very high repetition rates, resulting in EUV light with full spatial coherence. The result is a practical, single-box, coherent source useful for applications in metrology, ultrafast spectroscopy, imaging and microscopy. The soft x-ray flux can be improved further by increasing the laser pulse energy and/or repetition rate.
authors.affiliation: Department of Physics and JILA, University of Colorado and National Institute of Standards and Technology, Boulder, Colorado 80309-0440, USA. mchen@colorado.edu
authors.forename: M-C
authors.initials: MC
authors.lastname: Chen
authors.forename: M R
authors.initials: MR
authors.lastname: Gerrity
authors.forename: S
authors.initials: S
authors.lastname: Backus
authors.forename: T
authors.initials: T
authors.lastname: Popmintchev
authors.forename: X
authors.initials: X
authors.lastname: Zhou
authors.forename: P
authors.initials: P
authors.lastname: Arpin
authors.forename: X
authors.initials: X
authors.lastname: Zhang
authors.forename: H C
authors.initials: HC
authors.lastname: Kapteyn
authors.forename: M M
authors.initials: MM
authors.lastname: Murnane
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity