Improving the resolution obtained in lensless imaging with spatially shaped high-order harmonics
European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference (CLEO®/Europe-EQEC 2017) Institute of Electrical and Electronics Engineers (2017)
Abstract:
The resolution obtained with coherent diffractive imaging (CDI) is limited by a number of factors, one of which is the transverse coherence of the illuminating beam. For a successful reconstruction, it is accepted that the illuminating beam should have a lateral coherence length of at least twice the largest linear dimension of the sampleMultimode quasi-phase-matching of high-order harmonic generation in gas-filled photonic crystal fibers
Conference on Lasers and Electro-Optics/Europe and the European Quantum Electronics Conference (CLEO/Europe-EQEC 2017) Institute of Electrical and Electronics Engineers (2017)
Abstract:
Driving bright high-order harmonic generation (HHG) with few-μJ pulses is a crucial step towards compact, high average power sources of coherent extreme ultraviolet (XUV) radiation for time-integrated applications including imaging. Unfortunately, reaching a sufficiently strong E-field to perform HHG with these pulses requires tight focusing, greatly reducing the interaction volume. An elegant solution to this problem is to restrict HHG to a hollow waveguide [1] and in particular a photonic crystal fiber [2]. Strong reabsorption in the XUV prohibits the use of multi-atmosphere pressures to achieve phase-matching [3], and instead quasi-phase-matching (QPM) is preferred. Here we demonstrate QPM of HHG for the first time within a gas-filled PCF.Quasi-phase-matched high harmonic generation in gas-filled photonic crystal fibers
2017 Conference on Lasers and Electro-Optics (CLEO 2017) Optical Society of America (2017)
Abstract:
We investigate HHG in gas-filled PCFs with microjoule driving lasers. QPM is implemented for the first time, enhancing the flux at 30 eV by a factor of 60.Excitation and Control of Plasma Wakefields by Multiple Laser Pulses
(2017)
Excitation and control of plasma wakefields by multiple laser pulses
Physical Review Letters American Physical Society 119:4 (2017) 044802