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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 11 — May. 23, 2011
  • pp: 10714–10727

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

Isamu Miyamoto, Kristian Cvecek, and Michael Schmidt  »View Author Affiliations


Optics Express, Vol. 19, Issue 11, pp. 10714-10727 (2011)
http://dx.doi.org/10.1364/OE.19.010714


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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.

© 2011 OSA

OCIS Codes
(140.3390) Lasers and laser optics : Laser materials processing
(140.3440) Lasers and laser optics : Laser-induced breakdown
(140.7090) Lasers and laser optics : Ultrafast lasers
(160.2750) Materials : Glass and other amorphous materials
(190.4180) Nonlinear optics : Multiphoton processes

ToC Category:
Lasers and Laser Systems

History
Original Manuscript: February 1, 2011
Revised Manuscript: April 20, 2011
Manuscript Accepted: May 4, 2011
Published: May 17, 2011

Citation
Isamu Miyamoto, Kristian Cvecek, and Michael Schmidt, "Evaluation of nonlinear absorptivity in internal modification of bulk glass by ultrashort laser pulses," Opt. Express 19, 10714-10727 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-11-10714


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