Truncated ultrashort-pulse small-angle Bessel beams

Grünwald, R.; Neumann, Uwe; Stibenz, Gero; Langer, Stefan; Steinmeyer, Günter; Kebbel, Volker; Neron, Jean-Luc; Piché, Michel

doi:10.1117/12.567390

Cited by 7 publications

(5 citation statements)

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“…The positions of minima remain constant for symmetric spectra, whereas the contrast significantly depends on the bandwidth and, for pulses with space-time coupling effects by travel time differences, on the pulse duration. This is further confirmed by the experimentally detected spatio-spectral map in the center of the Bessel zone (Figure 5), where most of the spectral content is localized within the central lobe and the spectrally resolved Bessel fringes diverge with increasing wavelength [2,80,118]. Therefore, a nondiffractive selection of the central lobe enables to minimize the spatial chirp and to optimize free-space pulse transfer.…”

Section: Ultrashort Pulsed Needle Beams and Linear Rogue Wavessupporting

confidence: 55%

“…If the central lobe is selected by a well-adapted diaphragm which matches the first minimum of the intensity distribution, i.e. the dark zone with the smallest intensity gradient, diffraction at the edge is minimized [2,118]. The configuration is based on a field apodization and was referred to as 'selfapodizing truncation' [2].…”

Section: Self-apodizing Truncation Of Bessel Beamsmentioning

confidence: 99%

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Needle beams: a review

Grünwald

Böck

2020

Advances in Physics: X

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Needle beams are highly attractive for applications which take advantage from a spatial and temporal localization of photons. High intensities, high resolution and extended depth of focus lead to fundamental advances in the optical system performance. Ultrashort, fringe-free, self-reconstructing nondiffracting pulses with undistorted temporal transfer are obtained by generating truncated Bessel beams under self-apodization conditions. Nondiffracting Talbot self-imaging of needle beam arrays enables to transfer near field information to the Fraunhofer zone. With addressable arrays of needle beams, reconfigurable time-wavefront sensors are built up. Moreover, spatial light modulators and flexible axicons are used to realize structured, highly localized wavepackets, accelerating beams and nondiffracting images.

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Section: Ultrashort Pulsed Needle Beams and Linear Rogue Wavessupporting

confidence: 55%

Section: Self-apodizing Truncation Of Bessel Beamsmentioning

confidence: 99%

Needle beams: a review

Grünwald

Böck

2020

Advances in Physics: X

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“…A timeline of significant events in the development of propagation-invariant wave packets. In chronological order: Brittingham's FWM (1983) [25]; finite-energy FWM (1985) [156]; synthesis of acoustic FWMs (1990) [85] and ultrasonic X-waves (1992) [33]; producing incoherent optical X-waves (1997) [34] and incoherent optical FWMs (2002) [96]; nonlinear X-waves (2003) [158] and coherent optical X-waves (2003) [159]; observing X-wave self-healing (2004) [160]; producing a needle beam (2004) [161]; observing a nonlinear transition from X-to O-shaped spectra in water (2005) [141]; measuring the group velocity of X-waves [162]; and accelerating X-waves (2009) [163]. Baseband ST wave packets have been pursued since 2016 [97].…”

Section: First Period: 1983-1996mentioning

confidence: 99%

“…In both cases, only a bright central peak is obtained. Measurements reveal that this truncation produces a stable 'needle beam' for an extended propagation distance with no side 'fringes' [161,188,189]. This unique feature allows for images to be transmitted with no diffraction by pixellating the transverse profile and utilizing an array of needle beams, one at each pixel [190][191][192].…”

Section: Second Period: 1996-2003mentioning

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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“…aperture diameter matching the first dark fringe of a Bessel intensity pattern) maintain ultra-broad spectral bandwidth as well as their pulse duration [3]. Compared to focused Gaussian beams, such needle-shaped TBB ("needle beams"; see ref.…”

Section: Introductionmentioning

confidence: 99%