Beam shaping phase DOEs engraved with femtosecond laser

Angela Soria-Garcia; Jorge Fantova; Luis Miguel Sanchez-Brea; Jesus del Hoyo; Joaquin Andres-Porras; Santiago M. Olaizola

doi:10.1117/12.3017605

20 June 2024 Beam shaping phase DOEs engraved with femtosecond laser

Angela Soria-Garcia, Jorge Fantova, Luis Miguel Sanchez-Brea, Jesus del Hoyo, Joaquin Andres-Porras, Santiago M. Olaizola

Author Affiliations +

Proceedings Volume 13005, Laser + Photonics for Advanced Manufacturing; 130050U (2024) https://doi.org/10.1117/12.3017605
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Conference Poster

Abstract

Diffractive Optical Elements (DOEs) are micro-structed devices which modulate the amplitude, phase, or polarization of a light beam. In this work, we use femtosecond laser direct writing (FLDW) and lithography techniques to manufacture binary phase DOEs which produce high quality intensity distributions for different fs-laser micromachining. We have designed DOEs whose intensity pattern contains an intense square flap-top to produce ablation with two less intense areas, one before for heating and one after for polishing the material. Then, we manufactured these phase DOEs over a dielectric material, fused silica. The phase modulation is produced by the optical path difference due to the topography induced by ablation. Finally, we have analyzed the structure of these DOEs, i.e. their phase shift and roughness, reaching an average roughness of 49.15 nm and a phase shift of 1.014π, very close to the designed value, π. Moreover, we study the far-field diffraction patterns of the engraved DOEs, which are in good agreement with the theoretical ones.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Angela Soria-Garcia, Jorge Fantova, Luis Miguel Sanchez-Brea, Jesus del Hoyo, Joaquin Andres-Porras, and Santiago M. Olaizola "Beam shaping phase DOEs engraved with femtosecond laser", Proc. SPIE 13005, Laser + Photonics for Advanced Manufacturing, 130050U (20 June 2024); https://doi.org/10.1117/12.3017605

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