Evaluation of nonlinear absorptivity in internal modification of bulk glass by ultrashort laser pulses

Language
en
Document Type
Article
Issue Date
2012-03-23
Issue Year
2011
Authors
Miyamoto, Isamu
Cvecek, Kristian
Schmidt, Michael
Editor
Abstract

Thermal conduction model is presented, by which nonlinear absorptivity of ultrashort laser pulses in internal modification of bulk glass is simulated. The simulated nonlinear absorptivity agrees with experimental values with maximum uncertainty of ±3% in a wide range of laser parameters at 10ps pulse duration in borosilicate glass. The nonlinear absorptivity increases with increasing energy and repetition rate of the laser pulse, reaching as high as 90%. The increase in the average absorbed laser power is accompanied by the extension of the laser-absorption region toward the laser source. Transient thermal conduction model for three-dimensional heat source shows that laser energy is absorbed by avalanche ionization seeded by thermally excited free-electrons at locations apart from the focus at pulse repetition rates higher than 100kHz.

Journal Title
Optics Express 19.11 (2011): S. 10714-10727. 23.03.2012 <http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-19-11-10714>
Citation

Optics Express 19.11 (2011): S. 10714-10727. 23.03.2012 http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-19-11-10714

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