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Liebmann M, Treffer A, Bock M, et al. Spectral anomalies and Gouy rotation around the singularity of ultrashort vortex pulses. Opt Express. 2017;25(21):26076-26088doi: 10.1364/OE.25.026076.
Liebmann, M., Treffer, A., Bock, M., Elsaesser, T., & Grunwald, R. (2017). Spectral anomalies and Gouy rotation around the singularity of ultrashort vortex pulses. Optics express, 25(21), 26076-26088. https://doi.org/10.1364/OE.25.026076
Liebmann, M, et al. "Spectral anomalies and Gouy rotation around the singularity of ultrashort vortex pulses." Optics express vol. 25,21 (2017): 26076-26088. doi: https://doi.org/10.1364/OE.25.026076
Liebmann M, Treffer A, Bock M, Elsaesser T, Grunwald R. Spectral anomalies and Gouy rotation around the singularity of ultrashort vortex pulses. Opt Express. 2017 Oct 16;25(21):26076-26088. doi: 10.1364/OE.25.026076. PMID: 29041269.
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Opt Express. 2017 Oct 16;25(21):26076-26088. doi: 10.1364/OE.25.026076.

Spectral anomalies and Gouy rotation around the singularity of ultrashort vortex pulses.

Optics express

M Liebmann, A Treffer, M Bock, T Elsaesser, R Grunwald

PMID: 29041269 DOI: 10.1364/OE.25.026076

Abstract

Spectral anomalies of femtosecond pulses with orbital angular momentum were studied in the vicinity of singularities. Bessel-Gauss (BG) beams were generated with mode-locked Ti:sapphire oscillators and dispersion-compensated diffractive axicons acting as spiral phase plates (SPPs). High-resolution two-dimensional spectral mapping was performed with a scanning fiber probe. Progressive rotation of the most pronounced features, known as "spectral eyes", in the maps of spectral moments was found at increasing propagation distance. The phenomenon is explained by a wavelength-dependent Gouy phase shift of interfering spectral components in the twisted wavefront. Spatial "spectral switching" was detected for few-cycle pulses. Possible improvements of selectivity are proposed.

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