Controlling the velocity of a femtosecond laser pulse using refractive lenses

Jolly, Spencer W.; Gobert, O.; Jeandet, Antoine; Quéré, F.

doi:10.1364/oe.384512

Cited by 50 publications

(29 citation statements)

References 24 publications

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“…The result is the low-frequency component is flying at the temporal leading edge and is focused onto the location far away from the focusing lens, vice versa. The propagation of this FLFO has already been well studied, and the velocity equation has been derived by Quéré, et al [24,25] and Froula, et al [26,50] independently. If based on geometrical optics and linear approximation, the velocity equation can be simplified as…”

Section: Resultsmentioning

confidence: 99%

“…Currently, the spatiotemporal (ST) coupling is frequently used to modulate the propagation or structure of a pulsed beam, which permits both velocity control (i.e., superluminal or subluminal, and accelerating or decelerating) and direction control (i.e., forward or backward) [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. The first example is the 3-dimensional (3-D) flying focus (FLFO) within the extended Rayleigh length independently demonstrated by Quéré, et al [24,25] (originally named "sliding focus") and Froula, et al [26,27] (originally named "flying focus"), respectively, which can propagate at an arbitrary group velocity in free space including all motion forms of superluminal or subluminal, accelerating or decelerating, and forward or backward propagations. The second example is the 2-D optical ST wave-packet demonstrated by Abouraddy, et al [28][29][30][31][32][33][34], which can also propagate at an arbitrary group velocity in free space including all above motion forms.…”

Section: Introductionmentioning

confidence: 99%

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Reciprocating propagation of laser pulse intensity in free space

Kawanaka

2021

Preprint

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The constant-speed straight-line propagation in free space is a basic characteristic of light. Recently, several novel spatiotemporal coupling methods, for example, flying focus (or named sliding focus), are developed to control light propagation including velocity and direction. In the method of flying focus, where temporal chirp and longitudinal chromatism are combined to increase the degree of freedom for coherent control, tunable-velocities and even backward-propagation have been demonstrated. Herein, we studied the transverse and longitudinal effects of the flying focus in space and time, respectively, and found in a specific physics interval existing an unusual reciprocating propagation that was quite different from the previous result. By significantly increasing the Rayleigh length in space and the temporal chirp in time, the newly created flying focus can propagate along a longitudinal axis firstly forward, secondly backward, and lastly forward again, and the longitudinal spatial resolution for a clear reciprocation flying focus improves with increasing the temporal chirp. When this new type of light is applied in the radiation pressure experiment, a reciprocating radiation-force can be produced in space-time accordingly. This finding further extends the control of light and might enable important potential applications.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reciprocating propagation of laser pulse intensity in free space

Kawanaka

2021

Preprint

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“…Such scenarios could be useful in a variety of applications, including laser machining, laser fusion, and electron acceleration 86 . Finally, we note that another promising approach for the spatio-temporal synthesis of optical wave packets of controllable group velocity has also been recently proposed and investigated [87][88][89] .…”

Section: Discussionmentioning

confidence: 98%

Free-space optical delay line using space-time wave packets

et al. 2020

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An optical buffer featuring a large delay-bandwidth-product—a critical component for future all-optical communications networks—remains elusive. Central to its realization is a controllable inline optical delay line, previously accomplished via engineered dispersion in optical materials or photonic structures constrained by a low delay-bandwidth product. Here we show that space-time wave packets whose group velocity is continuously tunable in free space provide a versatile platform for constructing inline optical delay lines. By spatio-temporal spectral-phase-modulation, wave packets in the same or in different spectral windows that initially overlap in space and time subsequently separate by multiple pulse widths upon free propagation by virtue of their different group velocities. Delay-bandwidth products of ~100 for pulses of width ~1 ps are observed, with no fundamental limit on the system bandwidth.

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“…Group velocities varying from −4c (in the backward direction) to 30c (in the forward direction) were measured, and in theory, arbitrary group velocities can be generated. The spatiotemporal dispersion method simultaneously demonstrated by Quéré et al and Froula et al can also adjust the group velocity of the focused intensity peak within a large range by changing the longitudinal chromatism and the temporal chirp [69][70][71] , and −0.09c to 39c flying focuses were measured in experiments. This work of the pulsefront deformed Bessel beam generation provides a third spatiotemporal coupling method to control the group velocity and acceleration 72 .…”

Section: Discussionmentioning

confidence: 99%

“…Another spatiotemporal coupling method is to control the group velocity of the intensity peak of a focused ultra-short pulse within the extended Rayleigh length (named as sliding focus or flying focus) by combining temporal chirp and longitudinal chromatism. This method was independently demonstrated by Quéré et al in theory 69,70 and Froula et al in experiments 71 . In this method, the longitudinal chromatism separates wavelength-dependent focuses along the propagation axis and the temporal chirp controls the appearance times of these focuses, so that the sliding/flying focus possesses a tunable effective group velocity, also achieving all motion forms (superluminal, subluminal, accelerating, decelerating, and backward-propagation).…”

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confidence: 94%

Optical wave-packet with nearly-programmable group velocities

Kawanaka

2020

Commun Phys

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During the process of Bessel beam generation in free space, spatiotemporal optical wave-packets with tunable group velocities and accelerations can be created by deforming pulse-fronts of injected pulsed beams. So far, only one determined motion form (superluminal or luminal or subluminal for the case of group velocity; and accelerating or uniform-motion or decelerating for the case of acceleration) could be achieved in a single propagation path. Here we show that deformed pulse-fronts with well-designed axisymmetric distributions (unlike conical and spherical pulse-fronts used in previous studies) allow us to obtain nearly-programmable group velocities with several different motion forms in a single propagation path. Our simulation shows that this unusual optical wave-packet can propagate at alternating superluminal and subluminal group velocities along a straight-line trajectory with corresponding instantaneous accelerations that vary periodically between positive (acceleration) and negative (deceleration) values, almost encompassing all motion forms of the group velocity in a single propagation path. Such unusual optical wave-packets with nearly-programmable group velocities may offer new opportunities for optical and physical applications.

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Controlling the velocity of a femtosecond laser pulse using refractive lenses

Cited by 50 publications

References 24 publications

Reciprocating propagation of laser pulse intensity in free space

Reciprocating propagation of laser pulse intensity in free space

Free-space optical delay line using space-time wave packets

Optical wave-packet with nearly-programmable group velocities

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