Cavity-enhanced noncollinear high-harmonic generation

Abstract

Femtosecond enhancement cavities have enabled multi-10-MHz-repetition-rate coherent extreme ultraviolet (XUV) sources with photon energies exceeding 100 eV-albeit with rather severe limitations of the net conversion efficiency and of the duration of the XUV emission. Here, we explore the possibility of circumventing both these limitations by harnessing spatiotemporal couplings in the driving field, similar to the "attosecond lighthouse," in theory and experiment. Our results predict dramatically improved output coupling efficiencies and efficient generation of isolated XUV attosecond pulses.

Coherent manipulation of extreme-ultraviolet Bessel vortex beam from solids by active wavefront shaping of driving fundamental beam

“…Other upfront approaches entailed diffractive Fresnel zone plates as demonstrated for ptychographic diffraction imaging 17 , laser ablation mass spectroscopy 18 , and solid-based plasmonic HHG 6 . In the gas medium, the phase matching of the non-collinear geometry has been investigated as an e cient scheme for generation of polarization controlled attosecond pulse 19 , cavity-assisted EUV 20,21 , and optical vortex [22][23][24] . A photon carrying non-zero orbital angular momentum (OAM) is versatile for wavefront multiplexing of communication systems 25 , micromanipulation of particle spins [26][27][28] , and ghost imaging 29 .…”

Coherent Manipulation of Extreme-Ultraviolet Bessel Vortex Beams from Solids by Active Wavefront Shaping of Driving Fundamental Beams

“…16 Other upfront approaches entailed diffractive Fresnel zone plates as demonstrated for ptychographic diffraction imaging, 17 laser ablation mass spectroscopy, 18 and solid-based plasmonic HHG. 6 In the gas medium, the phase matching of the noncollinear geometry has been investigated as an efficient scheme for generation of polarization controlled attosecond pulse, 19 cavity-assisted EUV, 20,21 and optical vortex. systems, 25 micromanipulation of particle spins, 26−28 and ghost imaging.…”

“…Other upfront approaches entailed diffractive Fresnel zone plates as demonstrated for ptychographic diffraction imaging, laser ablation mass spectroscopy, and solid-based plasmonic HHG . In the gas medium, the phase matching of the noncollinear geometry has been investigated as an efficient scheme for generation of polarization controlled attosecond pulse, cavity-assisted EUV, , and optical vortex. − A photon carrying nonzero orbital angular momentum (OAM) is versatile for wavefront multiplexing of communication systems, micromanipulation of particle spins, − and ghost imaging . Particularly, the EUV vortices can be used for observing interactions between electron orbits and high-energy photons .…”

Noncollinear Enhancement Cavity for Record-High Out-coupling Efficiency of an Extreme-UV Frequency Comb

“…Experimental results and accompanying simulations show that 5% [20,21] to potentially 20% OCE [22] can be achieved using a Gaussian cavity mode. In order to improve the OCE with pierced mirrors, specially tailored higher-order spatial modes have been explored for HHG [14,[23][24][25], however to date the out-coupled power is lower than that achieved from regular Gaussian-mode cavities [12].…”