Special Section on Interferometry

Phase measurement of structural modifications created by femtosecond laser pulses in glass with phase-shifting digital holographic microscopy

[+] Author Affiliations
Akiori Igarashi, Tomoshi Komori, Wataru Watanabe

Ritsumeikan University, College of Science and Engineering, Department of Electrical and Electronic Engineering, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan

Takayuki Tamaki

National Institute of Technology, Nara College, Department of Control Engineering, 22 Yata-cho, Yamatokoriyama, Nara 639-1080, Japan

Hidenobu Arimoto, Takashi Fukuda

National Institute of Advanced Industrial Science and Technology, Electronics and Photonics Research Institute, AIST Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan

Opt. Eng. 56(11), 111702 (Mar 07, 2017). doi:10.1117/1.OE.56.11.111702
History: Received October 3, 2016; Accepted December 28, 2016
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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.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Akiori Igarashi ; Tomoshi Komori ; Takayuki Tamaki ; Hidenobu Arimoto ; Takashi Fukuda, et al.
"Phase measurement of structural modifications created by femtosecond laser pulses in glass with phase-shifting digital holographic microscopy", Opt. Eng. 56(11), 111702 (Mar 07, 2017). ; http://dx.doi.org/10.1117/1.OE.56.11.111702


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