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22 February 2018 Spectral anomaly of ultrashort vortex pulses with axially oscillating twist
M. Liebmann, A. Treffer, M. Bock, T. Seiler, T. Elsässer, R. Grunwald
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Proceedings Volume 10549, Complex Light and Optical Forces XII; 105490F (2018) https://doi.org/10.1117/12.2287369
Event: SPIE OPTO, 2018, San Francisco, California, United States
Abstract
Spatially resolved spectroscopy of vortex beams is able to test the state of optical systems, to decode specific information or to sensitively indicate light-matter interactions. Spectral maps of ultrashort vortex pulses generated by hybrid diffractive-reflective spiral phase plates were studied experimentally and theoretically. Local spectral maps were detected by high-resolution scanning with a fiber-coupled spectrometer. Distributions of spectral centers of gravity and second moments were analyzed for femtosecond pulses. Gouy rotation of characteristic spectral features in the proximity of a phase singularity as a function of propagation distance was indicated in the spectral domain. Angular rotation was found to be modulated by weak oscillations. Analysis of spectral meta-moments indicates a fast switching and twisting behavior of spatial chirp.
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M. Liebmann, A. Treffer, M. Bock, T. Seiler, T. Elsässer, and R. Grunwald "Spectral anomaly of ultrashort vortex pulses with axially oscillating twist", Proc. SPIE 10549, Complex Light and Optical Forces XII, 105490F (22 February 2018); https://doi.org/10.1117/12.2287369
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KEYWORDS
Femtosecond phenomena
Spiral phase plates
Ultrafast phenomena
Wave propagation
Singular optics
Spectroscopy
Statistical analysis
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