7 March 2017 Phase measurement of structural modifications created by femtosecond laser pulses in glass with phase-shifting digital holographic microscopy
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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.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Akiori Igarashi, Tomoshi Komori, Takayuki Tamaki, Hidenobu Arimoto, Takashi Fukuda, 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 . Submission: Received: 3 October 2016; Accepted: 28 December 2016
Received: 3 October 2016; Accepted: 28 December 2016; Published: 7 March 2017
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