Pre-heating by defocusation of the CO2-Laser polishing beam: an experimental report from the lab-floor -INVITED

The laser beam polishing for glass and plastics is a purely thermal process and melts the ground or lapped structures to a depth of limited extent. This results in a smoothing of the surface, whereby the 1st - 4th order shape deviations can be corrected very well and transparent surfaces are created...

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Autores principales:	Bliedtner Jens, Faehnle Oliver, Layher Anne-Marie, Hassel Robin, Barz Andrea
Formato:	article
Lenguaje:	EN
Publicado:	EDP Sciences 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/def70a9322d64a45988d65389315d19d
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spelling	oai:doaj.org-article:def70a9322d64a45988d65389315d19d2021-12-02T17:12:51ZPre-heating by defocusation of the CO2-Laser polishing beam: an experimental report from the lab-floor -INVITED2100-014X10.1051/epjconf/202125503001https://doaj.org/article/def70a9322d64a45988d65389315d19d2021-01-01T00:00:00Zhttps://www.epj-conferences.org/articles/epjconf/pdf/2021/09/epjconf_eosam2021_03001.pdfhttps://doaj.org/toc/2100-014XThe laser beam polishing for glass and plastics is a purely thermal process and melts the ground or lapped structures to a depth of limited extent. This results in a smoothing of the surface, whereby the 1st - 4th order shape deviations can be corrected very well and transparent surfaces are created. The process is excellently suited for quartz glasses and other optical glasses with a low coefficient of expansion α. Furthermore, thermoplastics or metallic molds for injection molding and precision molding applications can also be polished with the laser beam. On the other hand, special measures are required for glasses with a high α, e.g. preheating of the component. For the investigations, a defocused laser beam was used for the defined preheating of glasses with high linear expansion coefficients. After reaching the material-specific preheating temperature, the laser beam was focused and the polishing process started. A defined cooling process follows again with a defocused beam. In this way, a ground biconvex lens made of boron crown glass was successfully polished. The laser-polished surfaces have an RMS value of 1- 3 nm. The polishing process can be used very flexibly. Likewise, very differently shaped optical components can be polished. The newly developed polishing regime is transferable to other optical glasses with high linear expansion coefficients.Bliedtner JensFaehnle OliverLayher Anne-MarieHassel RobinBarz AndreaEDP SciencesarticlePhysicsQC1-999ENEPJ Web of Conferences, Vol 255, p 03001 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Bliedtner Jens Faehnle Oliver Layher Anne-Marie Hassel Robin Barz Andrea Pre-heating by defocusation of the CO2-Laser polishing beam: an experimental report from the lab-floor -INVITED
description	The laser beam polishing for glass and plastics is a purely thermal process and melts the ground or lapped structures to a depth of limited extent. This results in a smoothing of the surface, whereby the 1st - 4th order shape deviations can be corrected very well and transparent surfaces are created. The process is excellently suited for quartz glasses and other optical glasses with a low coefficient of expansion α. Furthermore, thermoplastics or metallic molds for injection molding and precision molding applications can also be polished with the laser beam. On the other hand, special measures are required for glasses with a high α, e.g. preheating of the component. For the investigations, a defocused laser beam was used for the defined preheating of glasses with high linear expansion coefficients. After reaching the material-specific preheating temperature, the laser beam was focused and the polishing process started. A defined cooling process follows again with a defocused beam. In this way, a ground biconvex lens made of boron crown glass was successfully polished. The laser-polished surfaces have an RMS value of 1- 3 nm. The polishing process can be used very flexibly. Likewise, very differently shaped optical components can be polished. The newly developed polishing regime is transferable to other optical glasses with high linear expansion coefficients.
format	article
author	Bliedtner Jens Faehnle Oliver Layher Anne-Marie Hassel Robin Barz Andrea
author_facet	Bliedtner Jens Faehnle Oliver Layher Anne-Marie Hassel Robin Barz Andrea
author_sort	Bliedtner Jens
title	Pre-heating by defocusation of the CO2-Laser polishing beam: an experimental report from the lab-floor -INVITED
title_short	Pre-heating by defocusation of the CO2-Laser polishing beam: an experimental report from the lab-floor -INVITED
title_full	Pre-heating by defocusation of the CO2-Laser polishing beam: an experimental report from the lab-floor -INVITED
title_fullStr	Pre-heating by defocusation of the CO2-Laser polishing beam: an experimental report from the lab-floor -INVITED
title_full_unstemmed	Pre-heating by defocusation of the CO2-Laser polishing beam: an experimental report from the lab-floor -INVITED
title_sort	pre-heating by defocusation of the co2-laser polishing beam: an experimental report from the lab-floor -invited
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/def70a9322d64a45988d65389315d19d
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Pre-heating by defocusation of the CO2-Laser polishing beam: an experimental report from the lab-floor -INVITED

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