Single-shot wavefront characterization of high topological charge extreme-ultraviolet vortex

Pandey, Alok Kumar; Guilbaud, Olivier; Sanson, F.; Papagiannouli, Irène; Kabacinski, Adeline; Tissandier, F.; Harms, Fabrice; Beaugrand, Guillaume; Dovillaire, Guillaume; Baynard, Elsa; Demailly, J.; Lucas, Bruno; Neveu, O.; Pittman, M.; Ros, D.; Sebban, S.; Balcou, Ph.; Kazamias, S.

doi:10.1117/12.2592326

Cited by 1 publication

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“…However, this method fails at simultaneous retrieval of OAM as well as radial mode content. Contrastingly, Shack-Hartmann and Hartmann wavefront sensing averts these issues [ 50 , 51 , 52 , 53 ], offering the possibility of single-shot simultaneous detection of amplitude and phase, even in the extreme-ultraviolet spectral range [ 52 , 53 ]. With regard to OV, the Shack-Hartmann wavefront sensor has previously been utilized to estimate the Poynting vector skews and topological charge from the measured slopes [ 54 , 55 ], ascertain the coherence characteristics of partially-coherent, and also few-cycle OV [ 56 , 57 ], and wavefront reconstruction of OV bearing a topological charge of

[ 58 ].…”

Section: Introductionmentioning

confidence: 99%

Shack-Hartmann Wavefront Sensing of Ultrashort Optical Vortices

Pandey

Larrieu

Dovillaire

et al. 2021

Sensors

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Light beams carrying Orbital Angular Momentum (OAM), also known as optical vortices (OV), have led to fascinating new developments in fields ranging from quantum communication to novel light–matter interaction aspects. Even though several techniques have emerged to synthesize these structured-beams, their detection, in particular, single-shot amplitude, wavefront, and modal content characterization, remains a challenging task. Here, we report the single-shot amplitude, wavefront, and modal content characterization of ultrashort OV using a Shack-Hartmann wavefront sensor. These vortex beams are obtained using spiral phase plates (SPPs) that are frequently used for high-intensity applications. The reconstructed wavefronts display a helical structure compatible with the topological charge induced by the SPPs. We affirm the accuracy of the optical field reconstruction by the wavefront sensor through an excellent agreement between the numerically backpropagated and experimentally obtained intensity distribution at the waist. Consequently, through Laguerre–Gauss (LG) decomposition of the reconstructed fields, we reveal the radial and azimuthal mode composition of vortex beams under different conditions. The potential of our method is further illustrated by characterizing asymmetric Gaussian vortices carrying fractional average OAM, and a realtime topological charge measurement at a 10Hz repetition rate. These results can promote Shack-Hartmann wavefront sensing as a single-shot OV characterization tool.

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