®®®® SIIA Público

Título del libro:
Título del capítulo: Wavefront correction of Bessel beams by shaping its annular angular spectrum

Autores UNAM:
DENNIS SCHEIDT; ALEJANDRO VASQUEZ ARZOLA; PEDRO ANTONIO QUINTO SU;
Autores externos:

Idioma:

Año de publicación:
2024
Palabras clave:

Angular Spectrum; Bessel Beam; Spatial Light Modulator; Wavefront Correction; Wavefront Shaping


Resumen:

This work introduces a novel method to significantly reduce the number of measurements needed for wavefront correction in strongly scattering media, as compared to traditional approaches. The key innovation lies in defining the beam using an annular angular spectrum rather than a 2D grid. We employ a spatial light modulator (SLM) for both the preparation and sampling of the annular angular spectrum. The speckle pattern of the transmitted beam is evaluated at a single point of a detector, and the phase distribution is measured using 3-step interferometry. The final correction to the transmitted beam is achieved by applying the conjugate phase onto the initial beam defined on the spatial light modulator. Remarkably, 64 measurements already provide a reasonably effective wavefront correction. However, optimal results are attained when the spatial azimuthal sampling frequency of the angular spectrum matches the transverse wave vector of the generated quasi-Bessel beam. © 2024 SPIE.


Entidades citadas de la UNAM: