25 February 2014 Few-cycle vortex wavepackets with tunable topological charge
Author Affiliations +
Proceedings Volume 8999, Complex Light and Optical Forces VIII; 89990W (2014) https://doi.org/10.1117/12.2060877
Event: SPIE OPTO, 2014, San Francisco, California, United States
The control of the orbital angular momentum (OAM) of ultrashort laser pulses with highly compact, low-dispersion and flexible devices opens new prospects for momentum-sensitive applications in plasmonics, materials processing, biochemistry, microscopy or optical data transfer. We report on the generation of few-cycle vortex pulses of variable topological charge from a Ti:sapphire laser oscillator with novel types of thermally tunable reflective, spiral-phase micro-electro-mechanical systems (MEMS). The spatial and temporal properties of the pulses were characterized by a reconfigurable, nondiffracting Shack-Hartmann wavefront autocorrelator. The intensity propagation can be described by a Laguerre-Gaussian beam with slight distortions caused by the line of maximum phase step. The different topological charges were indicated by quantitatively comparing the lengths of measured transversal Poynting-vector components to corresponding numerical simulations.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
R. Grunwald, R. Grunwald, M. Bock, M. Bock, J. Brunne, J. Brunne, U. Wallrabe, U. Wallrabe, "Few-cycle vortex wavepackets with tunable topological charge", Proc. SPIE 8999, Complex Light and Optical Forces VIII, 89990W (25 February 2014); doi: 10.1117/12.2060877; https://doi.org/10.1117/12.2060877

Back to Top