1. Phase measurement of structural modifications created by femtosecond laser pulses in glass with phase-shifting digital holographic microscopy
- Author
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Takashi Fukuda, Takayuki Tamaki, Akiori Igarashi, Wataru Watanabe, Tomoshi Komori, and Hidenobu Arimoto
- Subjects
Materials science ,business.industry ,General Engineering ,Holography ,Phase (waves) ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Laser ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,law.invention ,Optics ,law ,0103 physical sciences ,Femtosecond ,Microscopy ,Digital holographic microscopy ,sense organs ,010306 general physics ,0210 nano-technology ,business ,Refractive index ,Digital holography - Abstract
When ultrashort laser pulses are focused inside a glass at a high repetition rate, structural changes occur because of the heat accumulation from the train of laser pulses. This report describes phase measurement of the structural changes induced inside glass by phase-shifting digital holographic microscopy. Two-dimensional phase distribution across the structural change for static exposure is retrieved. By focusing femtosecond laser pulses at the interface between two glass substrates, melted materials can directly weld glass plates. Quantitative phase measurement of welded glass substrates revealed that the refractive index decreased in the laser-irradiated zone.
- Published
- 2017
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