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High-order harmonic generation in a capillary discharge

United States Patent

7,729,403
June 1, 2010
View the Complete Patent at the US Patent & Trademark Office
A pre-ionized medium created by a capillary discharge results in more efficient use of laser energy in high-order harmonic generation (HHG) from ions. It extends the cutoff photon energy, and reduces the distortion of the laser pulse as it propagates down the waveguide. The observed enhancements result from a combination of reduced ionization energy loss and reduced ionization-induced defocusing of the driving laser as well as waveguiding of the driving laser pulse. The discharge plasma also provides a means to spectrally tune the harmonics by tailoring the initial level of ionization of the medium.
Rocca; Jorge J. (Fort Collins, CO), Kapteyn; Henry C. (Boulder, CO), Mumane; Margaret M. (Boulder, CO), Gaudiosi; David (Orlando, FL), Grisham; Michael E. (Fort Collins, CO), Popmintchev; Tenio V. (Boulder, CO), Reagan; Brendan A. (Fort Collins, CO)
Colorado State University Research Foundation (Fort Collins, CO), Regents of the University of Colorado, a body corporate (Denver, CO)
11/ 804,888
20080069171
May 21, 2007
GOVERNMENT SUPPORT DOE DE-FG02-04ER15592 A001 through the Department of Energy Office of Basic Energy Sciences, "High Harmonic Generation in Discharge-Ionized Plasma Channels." Grant awarded to Colorado State University, with subcontract to University of Colorado. National Science Foundation Cooperative Agreement No. EEC-0310717, NSF Engineering Research Center in Extreme Ultraviolet Science and Technology. Grant awarded to Colorado State University, with subcontract to University of Colorado.