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

Akiori Igarashi; Tomoshi Komori; Takayuki Tamaki; Hidenobu Arimoto; Takashi Fukuda; Wataru Watanabe

doi:10.1117/1.OE.56.11.111702

7 March 2017 Phase measurement of structural modifications created by femtosecond laser pulses in glass with phase-shifting digital holographic microscopy

Akiori Igarashi, Tomoshi Komori, Takayuki Tamaki, Hidenobu Arimoto, Takashi Fukuda, Wataru Watanabe

Author Affiliations +

Optical Engineering, Vol. 56, Issue 11, 111702 (March 2017). https://doi.org/10.1117/1.OE.56.11.111702

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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Akiori Igarashi, Tomoshi Komori, Takayuki Tamaki, Hidenobu Arimoto, Takashi Fukuda, and Wataru Watanabe "Phase measurement of structural modifications created by femtosecond laser pulses in glass with phase-shifting digital holographic microscopy," Optical Engineering 56(11), 111702 (7 March 2017). https://doi.org/10.1117/1.OE.56.11.111702

Received: 3 October 2016; Accepted: 28 December 2016; Published: 7 March 2017

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