Characterisation of laser marks using digital holographic microscopy

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Characterisation of laser marks using digital holographic microscopy

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Title: Characterisation of laser marks using digital holographic microscopy
Author: Chee, Oi Choo; Sim, Eddy; Singh, Vijay Raj; Anand, Asundi
Copyright year: 2008
Abstract: The inspection and characterisation of laser marks using digital holographic microscopy (DHM) is presented in this paper. A DHM system in transmission mode was designed and the reconstruction algorithm for this configuration was investigated. The software was developed to provide live reconstruction of holograms for real time numerical evaluation of amplitude and phase contrast images. A CO2 laser-based marking system was employed to create marks on glass substrates. By analysing the quality, 3D profile measurement, and material distribution of the marked area, the parameters of the laser system could be optimised to achieve the desired mark. The phase contrast images provide quantitative refractive index analysis and 3D profile studies. The results were compared with those obtained using white light confocal microscopy. The capabilities and advantages of the DHM system for the analysis of laser marks are also presented
Subject: DRNTU::Science::Physics::Optics and light
Type: Conference Paper
Conference name: International Symposium on Laser Metrology (9th : 2008 : Singapore)
School: School of Mechanical and Aerospace Engineering
Rights: © 2008 SPIE.  This is the author created version of a work that has been peer reviewed and accepted for publication by Ninth International Symposium on Laser Metrology, SPIE.  It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: http://dx.doi.org/10.1117/12.814729.
Version: Accepted version

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