The Role of Thermal Accumulation on the Fabrication of Diffraction Gratings in Ophthalmic PHEMA by Ultrashort Laser Direct Writing
The fabrication of diffraction gratings by ultrashort direct laser writing in poly-hydroxyethyl-methacrylate (PHEMA) polymers used as soft contact lenses is reported. Diffraction gratings were inscribed by focusing laser radiation 100 µm underneath the surface of the samples. Low- and high-repetitio...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-12-01
|
| Series: | Polymers |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4360/12/12/2965 |
| _version_ | 1797544943506423808 |
|---|---|
| author | Daniel Sola Javier R. Vázquez de Aldana Pablo Artal |
| author_facet | Daniel Sola Javier R. Vázquez de Aldana Pablo Artal |
| author_sort | Daniel Sola |
| collection | DOAJ |
| description | The fabrication of diffraction gratings by ultrashort direct laser writing in poly-hydroxyethyl-methacrylate (PHEMA) polymers used as soft contact lenses is reported. Diffraction gratings were inscribed by focusing laser radiation 100 µm underneath the surface of the samples. Low- and high-repetition rate Ti:sapphire lasers with 120 fs pulsewidth working at 1 kHz and 80 MHz respectively were used to assess the role of thermal accumulation on microstructural and optical characteristics. Periodic patterns were produced for different values of repetition rate, pulse energy, laser wavelength, distance between tracks, and scanning speed. Compositional and structural modifications of the processed areas were studied by micro-Raman spectroscopy showing that under certain parameters, thermal accumulation may result in local densification. Far-field diffraction patterns were recorded for the produced gratings to assess the refractive index change induced in the processed areas. |
| first_indexed | 2024-03-10T14:07:38Z |
| format | Article |
| id | doaj.art-3b9a08ec646c4031acbbc09bdf48140f |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T14:07:38Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-3b9a08ec646c4031acbbc09bdf48140f2023-11-21T00:27:20ZengMDPI AGPolymers2073-43602020-12-011212296510.3390/polym12122965The Role of Thermal Accumulation on the Fabrication of Diffraction Gratings in Ophthalmic PHEMA by Ultrashort Laser Direct WritingDaniel Sola0Javier R. Vázquez de Aldana1Pablo Artal2Institut für Fertigungstechnik, Technische Universität Dresden, 01069 Dresden, GermanyAplicaciones del Láser y Fotónica, University of Salamanca, 37008 Salamanca, SpainLaboratorio de Óptica, Centro de Investigación en Óptica y Nanofísica, Campus Espinardo, Universidad de Murcia, 30100 Murcia, SpainThe fabrication of diffraction gratings by ultrashort direct laser writing in poly-hydroxyethyl-methacrylate (PHEMA) polymers used as soft contact lenses is reported. Diffraction gratings were inscribed by focusing laser radiation 100 µm underneath the surface of the samples. Low- and high-repetition rate Ti:sapphire lasers with 120 fs pulsewidth working at 1 kHz and 80 MHz respectively were used to assess the role of thermal accumulation on microstructural and optical characteristics. Periodic patterns were produced for different values of repetition rate, pulse energy, laser wavelength, distance between tracks, and scanning speed. Compositional and structural modifications of the processed areas were studied by micro-Raman spectroscopy showing that under certain parameters, thermal accumulation may result in local densification. Far-field diffraction patterns were recorded for the produced gratings to assess the refractive index change induced in the processed areas.https://www.mdpi.com/2073-4360/12/12/2965ultrafast laser inscriptionlaser materials processingpolymersdiffraction gratingsophthalmic material |
| spellingShingle | Daniel Sola Javier R. Vázquez de Aldana Pablo Artal The Role of Thermal Accumulation on the Fabrication of Diffraction Gratings in Ophthalmic PHEMA by Ultrashort Laser Direct Writing Polymers ultrafast laser inscription laser materials processing polymers diffraction gratings ophthalmic material |
| title | The Role of Thermal Accumulation on the Fabrication of Diffraction Gratings in Ophthalmic PHEMA by Ultrashort Laser Direct Writing |
| title_full | The Role of Thermal Accumulation on the Fabrication of Diffraction Gratings in Ophthalmic PHEMA by Ultrashort Laser Direct Writing |
| title_fullStr | The Role of Thermal Accumulation on the Fabrication of Diffraction Gratings in Ophthalmic PHEMA by Ultrashort Laser Direct Writing |
| title_full_unstemmed | The Role of Thermal Accumulation on the Fabrication of Diffraction Gratings in Ophthalmic PHEMA by Ultrashort Laser Direct Writing |
| title_short | The Role of Thermal Accumulation on the Fabrication of Diffraction Gratings in Ophthalmic PHEMA by Ultrashort Laser Direct Writing |
| title_sort | role of thermal accumulation on the fabrication of diffraction gratings in ophthalmic phema by ultrashort laser direct writing |
| topic | ultrafast laser inscription laser materials processing polymers diffraction gratings ophthalmic material |
| url | https://www.mdpi.com/2073-4360/12/12/2965 |
| work_keys_str_mv | AT danielsola theroleofthermalaccumulationonthefabricationofdiffractiongratingsinophthalmicphemabyultrashortlaserdirectwriting AT javierrvazquezdealdana theroleofthermalaccumulationonthefabricationofdiffractiongratingsinophthalmicphemabyultrashortlaserdirectwriting AT pabloartal theroleofthermalaccumulationonthefabricationofdiffractiongratingsinophthalmicphemabyultrashortlaserdirectwriting AT danielsola roleofthermalaccumulationonthefabricationofdiffractiongratingsinophthalmicphemabyultrashortlaserdirectwriting AT javierrvazquezdealdana roleofthermalaccumulationonthefabricationofdiffractiongratingsinophthalmicphemabyultrashortlaserdirectwriting AT pabloartal roleofthermalaccumulationonthefabricationofdiffractiongratingsinophthalmicphemabyultrashortlaserdirectwriting |