Space-time wave packets in multimode optical fibers with controlled dynamic motions and tunable group velocities

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: Feb. 27, 2025

Space-time wave packets (STWPs) with correlated spatial and frequency degrees of freedom exhibit time-dependent interference, thereby giving rise to interesting dynamic evolution behaviors. While versatile spatiotemporal phenomena have been demonstrated in freely propagating fields, coupling light into multimode fibers remains a fundamental experimental challenge. Whereas synthesizing STWPs typically relies on continuum plane-wave modes, their multimode-fiber counterparts must be constructed from the discrete set fiber modes whose propagation constants depend structures. Here, we demonstrate axially controllable motion transverse profile reconfigurable group velocity graded-index fibers. This is accomplished by introducing linear association between comb lines corresponding modes. The synthesized present rotation translation 4.8-ps period. Simultaneously, can tuned positive subluminal superluminal negative values (e.g., 0.870, 1.35, 10, –3.3 × 108 m/s, respectively). Su et al. ultra-fast pulses dynamically evolving profiles tunable velocities ranging values, achieved through space-time packets.

Language: Английский

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Synthesis of space-time wave packets using correlated frequency comb and spatial field

Nanophotonics, Journal Year: 2025, Volume and Issue: unknown

Published: March 20, 2025

Abstract Shaping transverse degrees of freedom across different temporal frequency spectra has unlocked new possibilities for realizing a wide variety novel spatiotemporal phenomena. In particular, using the discrete frequencies optical combs synthesis enables precise spatial separation and control individual spectral lines, thereby facilitating experimental generation space-time wave packets (STWPs). This review explores theoretical investigation demonstration versatile STWPs synthesized correlated comb lines fields, including following: (a) exhibiting dynamic evolution properties; (b) with customized group velocities; (c) longitudinal over STWPs.

Language: Английский

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Shaping space-time wave packets beyond the paraxial limit using a dispersion magnifier

Physical review. A/Physical review, A, Journal Year: 2025, Volume and Issue: 111(1)

Published: Jan. 6, 2025

Space-time wave packets (STWPs) have received significant attention since they can propagate in free space at arbitrary group velocity without dispersion and diffraction. However, present, the generation of STWPs has been limited to paraxial regime. Here we show that conventional optical elements be used extend beyond A magnifier, consisting two lenses a beam expander, applies spatiotemporal shaping create nonparaxial STWPs. The control magnification ratio results versatile engineering capabilities on velocity, diameter, propagation distance. As an example, numerically demonstrate long-distance or slow output packet with subwavelength cross sections. locked icon Physics Subject Headings (PhySH)Optics & lasersStructured lightUltrafast optics

Language: Английский

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Efficient multimode vectorial nonlinear propagation solver beyond the weak guidance approximation

Journal of the Optical Society of America B, Journal Year: 2024, Volume and Issue: 41(5), P. 1160 - 1160

Published: April 1, 2024

In this paper, we present an efficient numerical model able to solve the vectorial nonlinear pulse propagation equation in circularly symmetric multimode waveguides. The algorithm takes advantage of conservation total angular momentum light upon and into account nature propagating modes, making it particularly relevant for studies ring-core fibers. While conventional solvers exhibit a computational complexity scaling as N mode 4 , where is number considered solver scales 3/2 . As first example, shown that orbital modulation instability processes take place fibers realistic conditions. Finally, predicted process followed by appearance breather-like structures.

Language: Английский

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Experimental realization of Lorentz boosts of space-time wave packets

Physical review. A/Physical review, A, Journal Year: 2024, Volume and Issue: 109(1)

Published: Jan. 19, 2024

The authors present an experimental procedure that is analogous to Lorentz boosts of space-time wave packets (STWPs), in the physical transformation identical mathematical impact a except for overall Doppler shift carrier. Their work indicates boost STWP results another STWP.

Language: Английский

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Universal angular-dispersion synthesizer

Journal of the Optical Society of America A, Journal Year: 2023, Volume and Issue: 41(1), P. 83 - 83

Published: Nov. 20, 2023

We uncover a surprising gap in optics with regards to angular dispersion (AD). A systematic examination of pulsed optical field configurations classified according their three lowest orders resulting from AD (the axial phase velocity, group and group-velocity dispersion) reveals that the majority possible classes fields have eluded thus far. This is due part limited technical reach standard components provide such as gratings prisms, but also misconceptions regarding set physically admissible can be accessed via AD. For example, it has long been thought cannot yield normal free space. introduce "universal synthesizer": pulsed-beam shaper produces wavelength-dependent propagation angle arbitrary spectral profile, thereby enabling access all realizable universal synthesizer versatile tool for preparing cancellation, signal processing, nonlinear optics.

Language: Английский

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Demonstration of Space-Time Wave Packets in Optical Fibers with Dynamic Motion and Tunable Group Velocity

Frontiers in Optics + Laser Science 2022 (FIO, LS), Journal Year: 2023, Volume and Issue: unknown, P. JTu7B.1 - JTu7B.1

Published: Jan. 1, 2023

We experimentally demonstrate STWPs in fiber by synthesizing various spatial modes onto frequency comb lines. Fiber are tailored to: (a) dynamically rotate/translate with a 4.8- ps period, and (b) have tunable group velocity of 10.05, 0.88, -3.24×10 8 m/s.

Language: Английский

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Multi-octave mid-infrared supercontinuum generation in tapered chalcogenide-glass rods

Optics Letters, Journal Year: 2023, Volume and Issue: 48(21), P. 5479 - 5479

Published: Oct. 2, 2023

We report on the experimental development of short-tapered chalcogenide-glass rods for mid-infrared supercontinuum generation. Multi-octave spectral broadening femtosecond laser pulses is demonstrated from 1.6 to 15.6 µm in a 5-cm-long tapered Ge20Se70Te10 rod with waist diameter 25 µm. Despite multimode nature optical waveguide used, this work clearly shows potential such simple post-processed advancing fiber SC sources infrared glasses, thereby unlocking new possibilities terms coupling efficiency, coverage, and output power.

Language: Английский

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High-gain far-detuned nonlinear frequency conversion in a few-mode graded-index optical fiber

Scientific Reports, Journal Year: 2024, Volume and Issue: 14(1)

Published: July 9, 2024

We present theoretical and experimental evidence of high-gain far-detuned nonlinear frequency conversion, extending towards both the visible mid-infrared, in a few-mode graded-index silica fiber pumped at 1.064 μm , more specifically achieving gains hundreds dB per meter below 0.65 beyond 3.5 . Interestingly, our findings highlight potential fibers for enabling wavelength conversion into strong-loss spectral region silica. Such advancements require an accurate interpretation intramodal intermodal four-wave mixing processes.

Language: Английский

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Azimuthal Modulation Instability, Breathers, and Solitons in Ring-Core Optical Fibers

ACS Photonics, Journal Year: 2024, Volume and Issue: 11(8), P. 3140 - 3149

Published: July 17, 2024

Manipulating and processing orbital angular momentum of light with optical fibers still remains a very challenging complex task. We investigate the existence transverse (i.e., multidimensional) nonlinear waves as new route for all-optical conversion amplification states. In particular, we numerically azimuthal modulation instability in an fiber supporting modes only, i.e., vortex fiber, by means scalar multimode unidirectional pulse propagation equation. demonstrate that linear stage this taking place such ring-core anomalous rotation group-velocity dispersion, provides possibilities terms modes. Moreover, reveal full dynamics can be simply described analytical breather solutions corresponding Schrödinger Azimuthal soliton compression are also unveiled, well specific spatial rotating features function topological charge involved.

Language: Английский

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