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Optical Materials Express

Optical Materials Express

  • Editor: David J. Hagan
  • Vol. 3, Iss. 10 — Oct. 1, 2013
  • pp: 1716–1726

Role of thermal ionization in internal modification of bulk borosilicate glass with picosecond laser pulses at high repetition rates

Mingying Sun, Urs Eppelt, Wolfgang Schulz, and Jianqiang Zhu  »View Author Affiliations


Optical Materials Express, Vol. 3, Issue 10, pp. 1716-1726 (2013)
http://dx.doi.org/10.1364/OME.3.001716


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Abstract

We study the roles of thermal ionization and electronic damage in the internal modification of bulk borosilicate glass by high repetition rate picosecond laser pulses. Laser-induced plasma generation, nonlinear energy deposition and steady temperature distribution are numerically analyzed. The simulated modified regions show good agreement with the experimental results, thereby revealing the roles of thermal damage and electronic damage in the internal modification. While the elliptical outer structure is recognized as the molten region, we found that the teardrop-shaped inner structure is the damaged zone caused by high-density free-electrons. In the formation of the inner structure, cascade ionization is seeded by thermal ionization instead of multi-photon ionization and dramatically increases the free-electron density to the damage threshold. The contour of the inner structure is found to be corresponding to a characteristic isotherm of around 3000 ~4000 °C.

© 2013 OSA

OCIS Codes
(140.3330) Lasers and laser optics : Laser damage
(140.3440) Lasers and laser optics : Laser-induced breakdown
(160.2750) Materials : Glass and other amorphous materials
(320.5390) Ultrafast optics : Picosecond phenomena
(320.7090) Ultrafast optics : Ultrafast lasers
(350.3390) Other areas of optics : Laser materials processing

ToC Category:
Laser Materials Processing

History
Original Manuscript: July 30, 2013
Revised Manuscript: September 13, 2013
Manuscript Accepted: September 15, 2013
Published: September 24, 2013

Virtual Issues
Ultrafast Laser Modification of Materials (2013) Optical Materials Express

Citation
Mingying Sun, Urs Eppelt, Wolfgang Schulz, and Jianqiang Zhu, "Role of thermal ionization in internal modification of bulk borosilicate glass with picosecond laser pulses at high repetition rates," Opt. Mater. Express 3, 1716-1726 (2013)
http://www.opticsinfobase.org/ome/abstract.cfm?URI=ome-3-10-1716


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