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Phase matching of high order harmonic generation using dynamic phase modulation caused by a non-collinear modulation pulse

United States Patent

February 16, 2010
View the Complete Patent at the US Patent & Trademark Office
Phase matching high harmonic generation (HHG) uses a single, long duration non-collinear modulating pulse intersecting the driving pulse. A femtosecond driving pulse is focused into an HHG medium (such as a noble gas) to cause high-harmonic generation (HHG), for example in the X-ray region of the spectrum, via electrons separating from and recombining with gas atoms. A non-collinear pulse intersects the driving pulse within the gas, and modulates the field seen by the electrons while separated from their atoms. The modulating pulse is low power and long duration, and its frequency and amplitude is chosen to improve HHG phase matching by increasing the areas of constructive interference between the driving pulse and the HHG, relative to the areas of destructive interference.
Cohen; Oren (Boulder, CO), Kapteyn; Henry C. (Boulder, CO), Mumane; Margaret M. (Boulder, CO)
Rugents of the University of Colorado a body corporate (Denver, CO)
12/ 002,523
December 17, 2007
GOVERNMENT SUPPORT The present invention was made with the support of the U.S. government, which may have certain rights in this invention. Funding was provided by two sources: U.S. Department of Energy grant # DE-FG52-06NA26151, and The National Science Foundation grant # EEC0310717.