Abstract
High harmonic generation (HHG) is a central driver of the rapidly growing field of ultrafast science. We present a novel quasiphase-matching (QPM) concept with a dual-gas multijet target leading, for the first time, to remarkable phase control between multiple HHG sources (>2) within the Rayleigh range. The alternating jet structure with driving and matching zones shows perfect coherent buildup for up to six QPM periods. Although not in the focus of the proof-of-principle studies presented here, we achieved competitive conversion efficiencies already in this early stage of development.
Highlights
Coherent extreme ultraviolet (XUV) pulses of attosecond to femtosecond duration generated by high harmonic generation (HHG) in gases [1,2] are central to applications in ultrafast science [3,4,5,6] and the external seeding of freeelectron lasers (FELs) [7]
In terms of enhancing the brightness of such pulses, achieving absolute and independent phase control between multiple harmonic generation zones represents a major advance for High harmonic generation (HHG) sources
In the case of HHG, QPM is typically implemented by allowing the signal to build up over one coherence length Lc 1⁄4 =Ák and subsequently suppressing HHG for another coherence length until the driving field and harmonic field are in phase again
Summary
We present a novel quasiphase-matching (QPM) concept with a dual-gas multijet target leading, for the first time, to remarkable phase control between multiple HHG sources (> 2) within the Rayleigh range. In terms of enhancing the brightness of such pulses, achieving absolute and independent phase control between multiple harmonic generation zones represents a major advance for HHG sources.
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