Fabrication of small Bragg reflectors in glass with refractive index change induced by ultrashort laser pulses

1999 ◽  
Author(s):  
Kazuyoshi Itoh ◽  
Tadamasa Toma ◽  
Kazuhiro Yamada
Keyword(s):  
Refractive Index ◽  
Refractive Index Change ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Bragg Reflectors ◽  
Index Change ◽  
Ultrashort Laser

Estimation of the Refractive Index Change in Glass Induced by Femtosecond Laser Pulses

2000 ◽  
Vol 7 (1) ◽  
pp. 14-17 ◽  
Author(s):  
Tadamasa Toma ◽  
Yoshio Furuya ◽  
Wataru Watanabe ◽  
Kazuyoshi Itoh ◽  
Junji Nishii ◽  
...  
Keyword(s):  
Refractive Index ◽  
Femtosecond Laser ◽  
Refractive Index Change ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Index Change

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

2019 ◽  
Vol 9 (6) ◽  
pp. 1136 ◽  
Author(s):  
Ryo Sugimoto ◽  
Ryoji Maruyama ◽  
Wataru Watanabe
Keyword(s):  
Refractive Index ◽  
Phase Contrast ◽  
Refractive Index Change ◽  
Laser Pulses ◽  
Dark Field ◽  
Bright Field ◽  
Index Change ◽  
Structural Modifications ◽  
Led Array ◽  
Differential Phase Contrast

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.

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