Phase-matched enhancements of high-harmonic soft X-rays by adaptive wave-front control with a genetic algorithm

Abstract

We demonstrate the enhancement of high-harmonic soft-X-ray generation by adaptive wave-front control of a 745-nm Ti:sapphire laser by use of a 59-channel membrane deformable mirror, combined with a genetic algorithm, for the first time to our knowledge. The harmonics ranging from 17 nm to 28 nm were enhanced by factors up to 13. The numerical calculations illustrate that the enhancements of the plateau harmonics are due to macroscopic phase-matching effect, whereas those of the cutoff harmonics are due to the increase in focal intensity.

Single-shot extreme-ultraviolet wavefront measurements of high-order harmonics

“…DMs have been used in the past to modify the wavefront of the driving beam for HHG in setups with high repetition rates. This has been done to modify the astigmatism in the harmonic wavefront [29], and also to improve phase matching and thus the energy in the resulting APTs [43].…”

The modelling of quantum control systems

“…transmission of quantum information from one standing qubit to another via a flying photon qubit [41]) or field-field interaction (e.g. soft X-ray generation from a visible laser source [42]). In this regard, we will start from the description of matter-field interactions, showing that a control model with inputs and outputs can be built up by tuning either the fields or the material structures.…”

Scaling of the generation of high-order harmonics in large gas media with focal length

“…In a general sense, spatial shaping of the beam can be exploited to achieve both operations. Studies have been reported, using an annular slit in the beam [41], a hollow fiber [42], an adaptive mirror [43][44][45], or a Bessel-Gauss beam [46,47].…”