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Extreme-ultraviolet spatiotemporal vortices via high harmonic generation
Rodrigo Martin-Hernandez, Guan Gui, Luis Plaja +5
Spatiotemporal optical vortices (STOV) are space-time structured light pulses with a unique topology that couples spatial and temporal domains and carry transverse orbital angular…
Non-equilibrium States and Interactions in the Topological Insulator and Topological Crystalline Insulator Phases of NaCd4As3
Tika R Kafle, Yingchao Zhang, Yi-yan Wang +12
Topological materials are of great interest because they can support metallic edge or surface states that are robust against perturbations, with the potential for technological app…
Uncovering the Timescales of Spin Reorientation in
Sinéad A. Ryan, Anya Grafov, Na Li +8
Kagome ferrimagnets are of fundamental interest because of their tunable magnetic, electronic and topological properties, with potential applications for quantum-enabled technologi…
Non-Destructive, High-Resolution, Chemically Specific, 3D Nanostructure Characterization using Phase-Sensitive EUV Imaging Reflectometry
Michael Tanksalvala, Christina L. Porter, Yuka Esashi +22
Next-generation nano and quantum devices have increasingly complex 3D structure. As the dimensions of these devices shrink to the nanoscale, their performance is often governed by…
Phase matching of high harmonic generation in the soft and hard X-ray regions of the spectrum
Tenio Popmintchev, Ming-Chang Chen, Alon Bahabad +6
We show how bright, fully coherent, hard x-ray beams can be generated through nonlinear upconversion of femtosecond laser light. By using longer-wavelength mid-infrared driving las…
Shaped-pulse optimisation of coherent soft-x-rays
R. Bartels, S. Backus, E. Zeek +5
High-harmonic generation is one of the most extreme nonlinear-optical processes observed to date. By focusing an intense laser pulse into a gas, the light-atom interaction that occ…
Phase-Matching of High-Order Harmonics Driven by Mid- Infrared Light
Tenio Popmintchev, Ming-Chang Chen, Oren Cohen +4
We demonstrate that phase-matched frequency upconversion of ultrafast laser light can be extended to shorter wavelengths by using longer driving laser wavelengths. Experimentally,…
Phase Matching of High-Order Harmonics in Hollow Waveguides
Charles G. Durfee, Andy R. Rundquist, Sterling Backus +3
We investigate the case of phase-matched high-harmonic generation in a gas-filled capillary waveguide, comparing in detail theory with experiment. We observe three different regime…
Sub-wavelength coherent imaging of periodic samples using a 13.5 nm tabletop high harmonic light source
Dennis F. Gardner, Michael Tanksalvala, Elisabeth R. Shanblatt +9
Coherent diffractive imaging is unique as the only route for achieving diffraction-limited spatial resolution in the extreme ultraviolet and X-ray regions, limited only by the wave…
Generation of Spatially Coherent Light at Extreme Ultraviolet Wavelengths
Randy A. Bartels, Ariel Paul, Hans Green +7
We present spatial coherence measurements of extreme-ultraviolet light generated using the process of high-harmonic upconversion of a femtosecond laser. Using a phase-matched hollo…
Phase-Matched Generation of Coherent Soft-X-Rays
Andy Rundquist, Charles G. Durfee, Zenghu Chang +4
Phase-matched harmonic conversion of visible laser light into soft x-rays was demonstrated. The recently developed technique of guided-wave frequency conversion was used to upshift…
Bright Coherent Ultrahigh Harmonics in the keV X-Ray Regime from Mid-Infrared Femtosecond Lasers
Tenio Popmintchev, Ming-Chang Chen, Dimitar Popmintchev +17
High harmonic generation traditionally combines ~100 near-infrared laser photons, to generate bright, phase matched, extreme ultraviolet beams when the emission from many atoms add…
Visualizing Magnetic Order in Self-Assembly of Superparamagnetic Nanoparticles
Xingyuan Lu, Ji Zou, Minh Pham +16
We use soft x-ray vector-ptychographic tomography to determine the three-dimensional magnetization field in superparamagnetic nanoparticles self-assembled at the liquid-liquid inte…