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Appl. Sci. 2019, 9(6), 1136; https://doi.org/10.3390/app9061136

Acquisition of Multi-Modal Images of Structural Modifications in Glass with Programmable LED-Array-Based Illumination

Ritsumeikan University, Department of Electrical & Electronic Engineering, College of Science and Engineering, 1-1-1 Nojihigashi 525-8577, Kusatsu, Shiga, Japan
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Received: 27 December 2018 / Revised: 11 March 2019 / Accepted: 12 March 2019 / Published: 18 March 2019
(This article belongs to the Special Issue Selected Papers from the NMJ2018)
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Abstract

Ultrashort laser pulses can induce structural modifications in bulk glass, leading to refractive index change and scattering damage. As bright-field, dark-field, and phase imaging each provide complementary information about laser-induced structures, it is often desired to use multiple observations simultaneously. As described herein, we present the acquisition of bright-field, dark-field, and differential phase-contrast images of structural modifications induced in glass by femtosecond laser pulses with an LED array microscope. The contrast of refractive index change can be enhanced by differential phase-contrast images. We also report on the simultaneous acquisition of bright-field and dark-field images of structural modifications in a glass with LED-array-based Rheinberg illumination. A single-shot color image is separated to obtain bright field and dark field images simultaneously. We provide an experimental demonstration on multi-modal imaging of structural modifications in a glass with an LED array microscope using temporally-coded illumination and color-coded illumination. View Full-Text
Keywords: bright-field image; dark-field image; femtosecond laser; glass; laser processing; LED array microscopy; refractive index change; Rheinberg illumination; scattering damage; structural modification; welding bright-field image; dark-field image; femtosecond laser; glass; laser processing; LED array microscopy; refractive index change; Rheinberg illumination; scattering damage; structural modification; welding
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Sugimoto, R.; Maruyama, R.; Watanabe, W. Acquisition of Multi-Modal Images of Structural Modifications in Glass with Programmable LED-Array-Based Illumination. Appl. Sci. 2019, 9, 1136.

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