Coherent XUV Generation from Gases Ionized by Several Cycle Optical Pulses
C. KanDepartment of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G7N. H. BurnettDepartment of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G7C. E. CapjackDepartment of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G7R. RankinDepartment of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G7
1997en
ABI
Abstract
Recent advances in solid state laser technology enable efficient generation of optical frequency laser pulses a few cycles in duration with focused intensities in excess of ${10}^{15}\mathrm{W}/{\mathrm{cm}}^{2}$. When such pulses are propagated in neutral gases such as helium, ionization rates comparable to the optical frequency are induced. The very high ionization rates and the corresponding optical field strengths to which neutral atoms can be exposed with few cycle pulses present an intriguing possibility for coherent XUV generation. In this Letter, we will examine phase matching issues associated with this phenomenon.
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