Spectral anomaly of ultrashort vortex pulses with axially oscillating twist

被引：1
|
作者：
Liebmann, M. [1 ]
Treffer, A. [1 ]
Bock, M. [1 ]
Seiler, T. [2 ]
Elsaesser, T. [1 ]
Grunwald, R. [1 ]
机构：
[1] Max Born Inst Nonlinear Opt & Short Pulse Spect, Berlin, Germany
[2] Fernuniv, Opt Nachrichtentech, Hagen, Germany
来源：
COMPLEX LIGHT AND OPTICAL FORCES XII | 2018年 / 10549卷
关键词：
Orbital angular momentum; vortex beams; vortex pulses; femtosecond pulses; ultrafast optics; spectral maps; spiral phase plates; Gouy phase shift; Gouy rotation; ultrafast singular optics; optical anomaly; spectral eyes; PHASE SINGULARITIES; OPTICAL VORTEX; GOUY PHASE; BEAMS;
D O I：
10.1117/12.2287369
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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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页数：7
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