Femtosecond laser fabrication of monolithic double volume phase-gratings in glass
| Autor: | J. L. de la Peña, Santiago M. Olaizola, M. Gómez-Aranzadi, Tomas Morlanes, J. J. Azkona, A. Rodríguez |
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| Rok vydání: | 2020 |
| Předmět: |
Diffraction
Materials science Microscope business.industry 02 engineering and technology 021001 nanoscience & nanotechnology Laser Diffraction efficiency 01 natural sciences Ray Atomic and Molecular Physics and Optics Supercontinuum law.invention 010309 optics Optics law 0103 physical sciences Femtosecond Photonics 0210 nano-technology business |
| Zdroj: | Optics Express |
| ISSN: | 1094-4087 |
| DOI: | 10.1364/oe.402275 |
| Popis: | A diffractive optical element was fabricated by monolithically integrating two volume phase-gratings (VPGs) in the bulk of a single-piece transparent material. A computer model of the diffraction generated by the double volume phase-grating (DVPG) was made with a rigorous coupled wave analysis simulator. Simulations and experiments show that the diffractive behavior of a DVPG can be controlled by arranging the relative displacement and the distance between the VPGs according to Talbot self-imaging planes. In order to diffract the total incident light, the phase accumulation in the VPGs has to be π/2, which was achieved by single-scan femtosecond laser processing of a nanocrystal doped glass as the substrate material. Ex situ microscope images of the cross-sections are presented for laser processed lines in the form of VPGs and DVPGs. The far-field diffraction of DVPGs formed by selectively located VPGs was characterized with a monochromatic 633 nm and a supercontinuum white light. Functional designs of high diffraction efficiency with potential applications in photonics were successfully fabricated in a one-step and free of chemicals process. |
| Databáze: | OpenAIRE |
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