Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 4 of 4
Full-Text Articles in Physics
Ultrashort Intense-Field Optical Vortices Produced With Laser-Etched Mirrors, James Strohaber, Timothy D. Scarborough, Cornelis J. Uiterwaal
Ultrashort Intense-Field Optical Vortices Produced With Laser-Etched Mirrors, James Strohaber, Timothy D. Scarborough, Cornelis J. Uiterwaal
C.J.G.J. Uiterwaal Publications
We introduce a simple and practical method to create ultrashort intense optical vortices for applications involving high-intensity lasers. Our method utilizes femtosecond laser pulses to laser etch grating lines into laser-quality gold mirrors. These grating lines holographically encode an optical vortex. We derive mathematical equations for each individual grating line to be etched, for any desired (integer) topological charge. We investigate the smoothness of the etched grooves. We show that they are smooth enough to produce optical vortices with an intensity that is only a few percent lower than in the ideal case. We demonstrate that the etched gratings can …
A High Repetition Rate Time-Of-Flight Electron Energy Analyzer, Shawn A. Hilbert, Brett E. Barwick, M. Fabrikant, Cornelis J. Uiterwaal, Herman Batelaan
A High Repetition Rate Time-Of-Flight Electron Energy Analyzer, Shawn A. Hilbert, Brett E. Barwick, M. Fabrikant, Cornelis J. Uiterwaal, Herman Batelaan
C.J.G.J. Uiterwaal Publications
We demonstrate a time-of-flight electron energy analyzer that operates at an 80 MHz repetition rate. The analyzer yields an energy resolution of 40 meV for 3 eV electrons. The energy resolution limit is dominated by the detector time (or temporal) resolution. With a currently available detector with a temporal resolution of 100 ps, we predict an energy resolution of less than 1 meV for 200 meV electrons. This makes high repetition rate time-of-flight energy analyzers a promising low-technology alternative to current state-of-the-art techniques.
Efficient Angular Dispersion Compensation In Holographic Generation Of Intense Ultrashort Paraxial Beam Modes, James Strohaber, C. Petersen, Cornelis J. Uiterwaal
Efficient Angular Dispersion Compensation In Holographic Generation Of Intense Ultrashort Paraxial Beam Modes, James Strohaber, C. Petersen, Cornelis J. Uiterwaal
C.J.G.J. Uiterwaal Publications
We experimentally demonstrate that small misalignments of the pulse stretcher or compressor of our chirped-pulse-amplification laser can precompensate for angular chirp when producing ultrashort paraxial beam modes with holographic gratings. Using this approach we can eliminate one of the two gratings needed in our 2f–2f setup [Mariyenko et al., Opt. Express 13, 7599 (2005)]. This allows for up to an order of magnitude more output power. We see our method as the next step in the production of intense exotic forms of ultrashort pulses, which can be used in the investigation of intense laser–matter interactions. In addition, …
Tip-Top Imaging [Microscopy], Herman Batelaan, Cornelis J. Uiterwaal
Tip-Top Imaging [Microscopy], Herman Batelaan, Cornelis J. Uiterwaal
C.J.G.J. Uiterwaal Publications
Images of nanoscale structures can be constructed using the flow of electrons ejected from a metal probe tip by a fast laser pulse. The technique adds new dimensions to established methods of microscopy.