Self-imaging of tailored vortex pulse arrays and spectral Gouy rotation echoes

Liebmann, Max; Treffer, Alexander; Böck, Martin; Seiler, Thomas; Jahns, Jürgen; Elsaesser, Thomas; Grünwald, R.

doi:10.1364/ol.44.001047

Cited by 8 publications

(7 citation statements)

References 31 publications

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“…The capability of adaptive and passive optical components to generate OAM beams with variable spatio-spectral parameters, in particular to control the spectral Gouy rotation of pairs of blue-and red-shifted spectral eyes, was studied. Bessel-Gauss beams were either shaped by static lithographically structured, transmissive spiral phase gratings (SPG) [51][52][53] and continuous-relief spiral phase plates (SPPs) [54], or spiral and forked gratings flexibly programmed into the phase map of a liquid-crystal-on-silicon (LCoS) spatial light modulator (SLM) (GAEA 2, HOLOEYE Photonics AG, Berlin, Germany) [44]. The SLM enables one to individually address 4160 × 2464 pixels with 3.74 µm pitch at a fill factor of 90% with a frame rate of 58 Hz and 8 Bit dynamic range.…”

Section: Shaping Of Femtosecond Vortex Pulses With Stationary and Ada...mentioning

confidence: 99%

Ultrashort Vortex Pulses with Controlled Spectral Gouy Rotation

et al. 2020

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Recently, the spatio-spectral propagation dynamic of ultrashort-pulsed vortex beams was demonstrated by 2D mapping of spectral moments. The rotation of characteristic anomalies, so-called “spectral eyes”, was explained by wavelength-dependent Gouy phase shift. Controlling of this spectral rotation is essential for specific applications, e.g., communication and processing. Here, we report on advanced concepts for spectral rotational control and related first-proof-of-principle experiments. The speed of rotation of spectral eyes during propagation is shown to be essentially determined by angular and spectral parameters. The performance of fixed diffractive optical elements (DOE) and programmable liquid-crystal-on silicon spatial light modulators (LCoS-SLMs) that act as spiral phase gratings (SPG) or spiral phase plates (SPP) is compared. The approach is extended to radially chirped SPGs inducing axially variable angular velocity. The generation of time-dependent orbital angular momentum (self-torque) by superimposing multiple vortex pulses is proposed.

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Section: Shaping Of Femtosecond Vortex Pulses With Stationary and Ada...mentioning

confidence: 99%

Ultrashort Vortex Pulses with Controlled Spectral Gouy Rotation

et al. 2020

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“…6, which displays a periodic array of diffractive axicons. In this case of lateral and rotational symmetry combined, Talbot self-imaging is observed, however, the contributions of the vortices in each period add up to yield a spatial variation of the spectral phase 23 .…”

Section: Combination Of Translational and Rotational Symmetrymentioning

confidence: 97%

Symmetries in optical wavefields

Jahns

2019

Fourth International Conference on Applications of Optics and Photonics

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Symmetries in the propagation of a wavefield occur due to constraints, imposed either by the structure of an optical element/system or by the propagation medium. The spatial properties of a wavefield may be influenced by mirror symmetry, lateral inversion, translational and rotational symmetry. Here, we discuss various examples of light propagation under the constraints of specific symmetries. These include general aspects of light propagation, the design of micro-optical systems, rotational symmetries that occur in discretized diffractive optical elements as well as spatial and spatio-temporal properties of self-imaging wavefields.

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“…Since Gouy’s original demonstration by showing interference between a converging light and a reference plane light, the phase anomaly has been the subject of study for decades, − aiming to understand its physical origin and to observe it by using noninterference methods. ,− For example, direct, noninterferometric observation of such a phase shift was permitted for single-cycle terahertz pulses, unambiguously demonstrating the polarity reversal as a result of the Gouy phase shift. ,, Even for few-cycle laser pulses, the phase anomaly was observed with respect to their carrier envelope owing to stabilization of the carrier-envelope phase . In addition, there is a myriad of evidence that the Gouy phase shift is a universal phenomenon for all focused waves including nondiffracting beams (e.g., Airy and Bessel beams), − radially polarized beams, , and vortex beams. , Also, the Gouy phase shift is accumulated while a beam propagates plural optical components …”

Section: Introductionmentioning

confidence: 99%

Origin of Gouy Phase Shift Identified by Laser-Generated Focused Ultrasound

et al. 2020

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The Gouy phase shift, the phase change of a converging wave passing through a focus, is a general characteristic of waves of any kind, including light and sound. Direct observation of the phase shift has been typically limited to high-frequency short pulses, e.g., terahertz light pulses and picosecond sound pulses. We demonstrate the Gouy phase shift of relatively low-frequency, megahertz ultrasound, widely implemented for ultrasound imaging and sensing. This demonstration is experimentally enabled with monopolar ultrasound pulses generated by nanosecond laser excitation of a light-absorbing concave film, which undergoes polarity reversal from before to after focusing. Moreover, our simulation results for various input pressure profiles show that the Gouy phase shift is observed for beams with significant diffractions. The physical origin of the phase anomaly is intuitively explained based on Huygens’ principle and the acoustic interference of secondary waves, providing further understanding of the Gouy phase shift in optics as well.

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Self-imaging of tailored vortex pulse arrays and spectral Gouy rotation echoes

Cited by 8 publications

References 31 publications

Ultrashort Vortex Pulses with Controlled Spectral Gouy Rotation

Ultrashort Vortex Pulses with Controlled Spectral Gouy Rotation

Symmetries in optical wavefields

Origin of Gouy Phase Shift Identified by Laser-Generated Focused Ultrasound

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