Advanced properties of extended plasmas for efficient high-order harmonic generation
R. A. GaneevOphthalmology and Advanced Laser Medical Center, Saitama Medical University 1 , Saitama 350-0495, JapanMasatoshi SuzukiOphthalmology and Advanced Laser Medical Center, Saitama Medical University 1 , Saitama 350-0495, JapanHiroto KurodaOphthalmology and Advanced Laser Medical Center, Saitama Medical University 1 , Saitama 350-0495, Japan
2014en
ABI
Abstract
We demonstrate the advanced properties of extended plasma plumes (5 mm) for efficient harmonic generation of laser radiation compared with the short lengths of plasmas (∼0.3–0.5 mm) used in previous studies. The harmonic conversion efficiency quadratically increased with the growth of plasma length. The studies of this process along the whole extreme ultraviolet range using the long plasma jets produced on various metal surfaces, particularly including the resonance-enhanced laser frequency conversion and two-color pump, are presented. Such plasmas could be used for the quasi-phase matching experiments by proper modulation of the spatial characteristics of extended ablating area and formation of separated plasma jets.
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