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Keywords = spatiotemporal optical vortex beam

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7 pages, 1822 KiB  
Communication
Grating Pair Wavepacket Shaper for Crafting Spatiotemporal Optical Vortices with Arbitrary Tilt Angles
by Jordan Adams and Andy Chong
Photonics 2025, 12(2), 126; https://doi.org/10.3390/photonics12020126 - 31 Jan 2025
Viewed by 669
Abstract
Spatiotemporal optical vortices with arbitrary tilt angles can be generated by adjusting spatial chirp and beam size at a phase modulation plane in a pulse shaper setup. A grating pair setup is proposed to generate variable spatial chirp independent of the beam profile. [...] Read more.
Spatiotemporal optical vortices with arbitrary tilt angles can be generated by adjusting spatial chirp and beam size at a phase modulation plane in a pulse shaper setup. A grating pair setup is proposed to generate variable spatial chirp independent of the beam profile. The initial dispersion of the pulse allows for the independent control of the vortex orientation. By adjusting the beam size, spatial chirp, and initial dispersion, arbitrary vortex orientation across all the possible angles can be achieved. The ability to achieve arbitrary vortex orientations at long propagation distances could offer significant advantages for long-distance communication applications. Full article
(This article belongs to the Special Issue Progress in OAM Beams: Recent Innovations and Future Perspectives)
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8 pages, 4348 KiB  
Article
Optimization of Transverse OAM Transmission through Few-Mode Fiber
by Chong Zhang, Qian Cao and Qiwen Zhan
Photonics 2024, 11(4), 328; https://doi.org/10.3390/photonics11040328 - 1 Apr 2024
Cited by 2 | Viewed by 1462
Abstract
Spatiotemporal optical vortex (STOV) wavepacket is a new type of vortex optical field carrying transverse orbital angular momentum (OAM). Due to the presence of imbalanced dispersion and diffraction phase, the STOV pulse undergoes fragmentation during free space propagation, leading to the disappearance of [...] Read more.
Spatiotemporal optical vortex (STOV) wavepacket is a new type of vortex optical field carrying transverse orbital angular momentum (OAM). Due to the presence of imbalanced dispersion and diffraction phase, the STOV pulse undergoes fragmentation during free space propagation, leading to the disappearance of the spatiotemporal vortex phase structure. For practical applications, having a stable long-distance propagation of STOV pulse is critical. Recent work demonstrates the transmission of transverse OAM in few-mode fiber. However, the maximum transmission distance is limited to 100 cm due to excessive group velocity dispersion between modes. In this work, we optimize the transmission of transverse OAM by engineering fiber parameters. By tuning the radius of the fiber core and the relative refractive index difference, the group time delay difference values between the LP01 and LP11 modes and their corresponding group velocity dispersion coefficients are minimized. The simulation results show that the optimized fiber allows the first-order STOV pulse to propagate up to 500 cm, and the second-order STOV pulse up to 300 cm without distorting the spatiotemporal vortex phase structure. Long-distance propagation of STOV pulse can create new opportunities and facilitate applications such as developing novel transverse OAM lasers and telecommunication approaches. Full article
(This article belongs to the Special Issue Progress in OAM Beams: Recent Innovations and Future Perspectives)
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