Orbital angular momentum experiments with broadband few cycle pulses

Asmus Richter; Martin Bock; Juergen Jahns; Ruediger Grunwald

doi:10.1117/12.840907

8 February 2010 Orbital angular momentum experiments with broadband few cycle pulses

Asmus Richter, Martin Bock, Juergen Jahns, Ruediger Grunwald

Proceedings Volume 7613, Complex Light and Optical Forces IV; 761308 (2010) https://doi.org/10.1117/12.840907
Event: SPIE OPTO, 2010, San Francisco, California, United States

Abstract

Light distributions of Bessel-Gauss and Laguerre-Gauss type carry an orbital angular momentum and thus can be regarded as particular types of optical vortex beams. Optical vortices in highly intense femtosecond laser pulses are expected to lead to a variety of specific applications like momentum selective spectroscopy, nonlinear laser-material interaction or quantum information processing. Here we report on experiments with a Ti:sapphire laser oscillator at wavelengths around 800 nm. To compare the pulsed and cw case, the system was driven with and without mode-locking. At the minimum pulse duration of about 10 fs, a FWHM spectral bandwidth of 120 nm was available. By applying diffractive spiral phase elements, beams with topological charges of m = 1 and m = 2 were formed. The specific propagation behavior was studied by detecting spatially resolved intensity and spectral maps. In addition to the helical beam generation with fixed phase patterns, adaptive approaches based on liquid-crystal microdisplays are considered.

Citation Download Citation

Asmus Richter, Martin Bock, Juergen Jahns, and Ruediger Grunwald "Orbital angular momentum experiments with broadband few cycle pulses", Proc. SPIE 7613, Complex Light and Optical Forces IV, 761308 (8 February 2010); https://doi.org/10.1117/12.840907

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