Open AccessSpatiotemporal evolutions of ultrashort vortex pulses generated by spiral multi-pinhole plate
Author(s) -
Li Ma,
Pan Zhang,
Zhenhua Li,
Chunxiang Liu,
Xing Li,
Yuqin Zhang,
Ruirui Zhang,
Chuanfu Cheng
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.029864
Subject(s) - physics , vortex , optics , optical vortex , angular momentum , femtosecond , pulse (music) , pinhole (optics) , ultrashort pulse , laser , classical mechanics , mechanics , detector
We use the spiral multi-pinhole plate to generate ultrashort vortex pulses and study their spatiotemporal evolutions involving intensity, phase, orbital angular momentum, and energy current. In the experiment, a Mach-Zehnder-type interferometer is employed to perform the investigation of ultrashort vortices. Combining the experimental results and the theoretical analyses, we discuss the spatiotemporal evolutions of ultrashort vortex pulses in femtosecond regime. The results show that the distribution of orbital angular momentum in the cross-section of the vortex pulse is maintained almost invariable in the pulse duration, while both the intensity and the energy current obey a Gaussian-like distribution. With time evolution, the phase contour lines of such vortex pulses rotate around the propagation axis.