Sculpturing spatiotemporal wavepackets with chirped pulses

Cao, Qian; Chen, Jian; Lu, Keyin; Wan, Chenhao; Chong, Andy; Zhan, Qiwen

doi:10.1364/prj.439849

Cited by 30 publications

(14 citation statements)

References 13 publications

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“…However, this concept lay dormant until experiments by Milchberg et al uncovered that such STOVs occur during the nonlinear pulse collapse dynamics in self-focusing media [61]. Subsequently, it was recognized that STOVs can in fact be synthesized linearly [62,63], and the concept has since attracted considerable attention [388][389][390][391][392]. It is important to note that the axis of the OAM points in the 𝑦 direction rather than along 𝑧 as in conventional OAM beams, and such a STOV is thus said to exhibit transverse OAM.…”

Section: St Optical Vorticesmentioning

confidence: 99%

Space-time wave packets

Yessenov¹,

Hall²,

Schepler³

et al. 2022

Preprint

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Space-time' (ST) wave packets constitute a broad class of pulsed optical fields that are rigidly transported in linear media without diffraction or dispersion, and are therefore propagation-invariant in absence of optical nonlinearities or waveguiding structures. Such wave packets exhibit unique characteristics, such as controllable group velocities in free space and exotic refractive phenomena. At the root of of these behaviors is a fundamental feature underpinning ST wave packets: their spectra are not separable with respect to the spatial and temporal degrees of freedom. Indeed, the spatio-temporal structure is endowed with non-differentiable angular dispersion, in which each spatial frequency is associated with a single prescribed wavelength. Furthermore, deviation from this particular spatio-temporal structure yields novel behaviors that depart from propagation invariance in a precise manner, such as acceleration with an arbitrary axial distribution of the group velocity, tunable dispersion profiles, and Talbot effects in space-time. Although the basic concept of ST wave packets has been known since the 1980's, only very recently has rapid experimental development emerged. These advances are made possible by innovations in spatio-temporal Fourier synthesis, thereby opening a new frontier for structured light at the intersection of beam optics and ultrafast optics. Furthermore, a plethora of novel spatio-temporally structured optical fields (such as flying-focus wave packets, toroidal pulses, and ST optical vortices) are now providing a swathe of surprising characteristics, ranging from tunable group velocities to transverse orbital angular momentum. We review the historical development of ST wave packets, describe the new experimental approach for their efficient synthesis, and enumerate the various new results and potential applications for ST wave packets and other spatio-temporally structured fields that are rapidly accumulating, before casting an eye on a future roadmap for this field.

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Section: St Optical Vorticesmentioning

confidence: 99%

Space-time wave packets

Yessenov¹,

Hall²,

Schepler³

et al. 2022

Preprint

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“…Recently, kinds of spatiotemporal coupling methods are widely used to control the propagation or structure of Bessel wave-packets 24 – 28 , space–time wave-packets 29 – 38 , flying focuses 39 – 42 , spatiotemporal optical vortices 43 – 45 , etc. In our previous works, we have proposed a method to control the group-velocity and group-acceleration of the propagation-invariant optical wave-packet generated by the conical superposition by separating the pulse-front from the phase-front and shaping the pulse-front from a plane into an arbitrarily-axisymmetric distribution, and in simulation superluminal or luminal or subluminal group-velocities, accelerating or uniform-motion or decelerating group-accelerations, and even nearly-programmable group-velocities in a single propagating path have been introduced 46 , 47 .…”

Section: Introductionmentioning

confidence: 99%

Investigating group-velocity-tunable propagation-invariant optical wave-packets

Liu

Leng

et al. 2022

Sci Rep

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The group-velocity of the propagation-invariant optical wave-packet generated by the conical superposition can be controlled by introducing well-designed arbitrarily-axisymmetric pulse-front deformation, which permits realizing superluminal, subluminal, accelerating, decelerating, and even nearly-programmable group-velocities. To better understand the tunability of the group-velocity, the generation methods of this propagation-invariant optical wave-packet and the mechanisms of the tunable group-velocity in both the physical and Fourier spaces are investigated. We also have studied the relationship with the recently-reported space–time wave-packet, and this group-velocity-tunable propagation-invariant optical wave-packet should be a subset of the space–time wave-packet.

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“…Next, we further investigate how this SRSI method can be used to characterize the dispersion of ST-OAM pulses. Former studies have shown that dispersion can significantly reshape the spatiotemporal profile of ST-OAM pulses, , although the spectral intensity remains unchanged. ST-OAM pulses can acquire dispersion (i.e., chirp) as the beam propagates through optical elements such as lenses, beam splitters, filters, and so forth.…”

Section: Resultsmentioning

confidence: 99%

Single-Frame Characterization of Ultrafast Pulses with Spatiotemporal Orbital Angular Momentum

et al. 2022

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Light carrying spatiotemporal orbital angular momentum (ST-OAM) makes possible new types of optical vortices arising from transverse OAM. ST-OAM pulses exhibit novel properties during propagation, transmission, refraction, diffraction, and nonlinear conversion, attracting growing experimental and theoretical interest and studies. However, one major challenge is the lack of a simple and straightforward method for characterizing ultrafast ST-OAM pulses. Using spatially-resolved spectral interferometry, we demonstrate a simple, stationary, single-frame method to quantitatively characterize ultrashort light pulses carrying ST-OAM. Using our method, the presence of an ST-OAM pulse, including its main characteristics such as topological charge numbers and OAM helicity, can be identified easily from the unique and unambiguous features directly seen on the raw data-without any need for a full analysis of the data. After processing and reconstructions, other exquisite features, including pulse dispersion and beam divergence, can also be fully characterized. Our fast characterization method allows high-throughput and quick feedback during the generation and optical alignment processes of ST-OAM pulses. It is straightforward to extend our method to single-shot measurement by using a high-speed camera that matches the pulse repetition rate. This new method can help advance the field of spatially and temporally structured light and its applications in advanced metrologies.

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Sculpturing spatiotemporal wavepackets with chirped pulses

Cited by 30 publications

References 13 publications

Space-time wave packets

Space-time wave packets

Investigating group-velocity-tunable propagation-invariant optical wave-packets

Single-Frame Characterization of Ultrafast Pulses with Spatiotemporal Orbital Angular Momentum

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