Spatially coherent, phase matched, high-order harmonic EUV beams at 50 kHz.
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.
Chen
M-C
MC
Department of Physics and JILA, University of Colorado and National Institute of Standards and Technology, Boulder, Colorado 80309-0440, USA. mchen@colorado.edu
Gerrity
M R
MR
Backus
S
S
Popmintchev
T
T
Zhou
X
X
Arpin
P
P
Zhang
X
X
Kapteyn
H C
HC
Murnane
M M
MM
D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity