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Dr. Ariel J. Paul
Thesis: Coherent EUV Light from High-Order Harmonic Generation: Enhancement and Applications
to Lensless Diffractive Imaging

Thesis directed by Profs. Henry C. Kapteyn and Margaret M. Murnane The first half of this thesis presents the first demonstration of quasi-phase matching in the coherent high-order harmonic conversion of ultrafast laser pulses into the EUV region of the spectrum. To achieve this quasi-phase matching, a novel method of fabricating hollow waveguides with a modulated inner diameter was developed. This technique lead to significant enhancements of EUV flux at wavelengths shorter than were previously accessible by known phase-matching techniques. In the second half of this thesis, the first tabletop demonstration of lensless diffractive imaging with EUV light is presented using HHG in a gas-filled hollow waveguide to provide coherent illumination. This tabletop microscope shows a spatial resolution of ∼ 200 nm and a large depth of field. Furthermore, the technique is easily scalable to shorter wavelengths of interest to biological imaging.

(As seen above)

- Comparison of Near Wake-Flow Structure behind a Solid Cap with an Attached Bubble and a Solid Counterpart

- Measurements and Modeling of the Mean and Turbulent Flow Structure in High-Speed Rough-Wall Non-Equilibrium Boundary Layers

- Hydroxyl Tagging Velocimetry in cavity piloted Mach 2 Combustor

- New Raman Water Vapor and Temperature Lidar at JPL Table Mountain Facility: Optimization, Validations and Sonde Intercomparison

- MULTI-SPECTRAL RAMAN GAIN IN DUAL-ISOTOPE RUBIDIUM VAPOR

- Fast STED Microscopy

- Inactivation of Penicillum expansum in sour cherry juice, peach and apricot nectars by pulsed electric fields

- Differential phase contrast with a segmented detector in a scanning X-ray microprobe