Abstract
One way to increase the well known low efficiency of high order harmonics generation is to place the gas medium in a hollow core waveguide. The numerical model used to obtain driving and harmonics field configuration along and across the waveguide was developed for an arbitrary gas density profile and arbitrary fiber diameter modulation. The model was tested against experimental measurements and excellent agreement was obtained for the fluorescence emission along the waveguide. We analyse the influence of the diameter modulation which result from the fabrication process on both pulse propagation and on harmonic generation.
Highlights
Introduction and methodsHigh order harmonic generation (HHG) in gas, despite the low efficiency of the process, remains one of the main methods to obtain extreme ultra-violet (XUV) or soft X-ray attosecond pulses
The integrated microfluidic glass device devoted to XUV generation by HHG in gas medium is composed [1] of a main micro-channel that works as a hollow-core waveguide (HCW) for the propagation of the femtosecond laser pulse
High-order harmonics of the fundamental field are generated within the waveguide by the well-known three step process happening in every optical cycle of the laser field: ionization, acceleration and recombination of the electron found in the outermost shell of the atom
Summary
High order harmonic generation (HHG) in gas, despite the low efficiency of the process, remains one of the main methods to obtain extreme ultra-violet (XUV) or soft X-ray attosecond pulses. The integrated microfluidic glass device devoted to XUV generation by HHG in gas medium is composed [1] of a main micro-channel that works as a hollow-core waveguide (HCW) for the propagation of the femtosecond laser pulse. When building a model for HHG in macroscopic media [2] a first necessary step is solving the driving field propagation in the ionizing gas. We solved this problem by starting from the wave equation in time domain, transforming it in the moving frame and in frequency domain. The density distribution was obtained in a separate investigation by solving the gas flow problem in the specific topology of the fabricated structure
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