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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 25 — Dec. 5, 2011
  • pp: 25632–25642

Time dynamics of burst-train filamentation assisted femtosecond laser machining in glasses

Dagmar Esser, Saeid Rezaei, Jianzhao Li, Peter R. Herman, and Jens Gottmann  »View Author Affiliations

Optics Express, Vol. 19, Issue 25, pp. 25632-25642 (2011)

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Bursts of femtosecond laser pulses with a repetition rate of f = 38.5MHz were created using a purpose-built optical resonator. Single Ti:Sapphire laser pulses, trapped inside a resonator and released into controllable burst profiles by computer generated trigger delays to a fast Pockels cell switch, drove filamentation-assisted laser machining of high aspect ratio holes deep into transparent glasses. The time dynamics of the hole formation and ablation plume physics on 2-ns to 400-ms time scales were examined in time-resolved side-view images recorded with an intensified-CCD camera during the laser machining process. Transient effects of photoluminescence and ablation plume emissions confirm the build-up of heat accumulation effects during the burst train, the formation of laser-generated filaments and plume-shielding effects inside the deeply etched vias. The small time interval between the pulses in the present burst train enabled a more gentle modification in the laser interaction volume that mitigated shock-induced microcracks compared with single pulses.

© 2011 OSA

OCIS Codes
(140.7090) Lasers and laser optics : Ultrafast lasers
(160.2750) Materials : Glass and other amorphous materials
(320.2250) Ultrafast optics : Femtosecond phenomena
(100.0118) Image processing : Imaging ultrafast phenomena
(110.6915) Imaging systems : Time imaging

ToC Category:
Laser Microfabrication

Original Manuscript: February 7, 2011
Revised Manuscript: March 4, 2011
Manuscript Accepted: March 4, 2011
Published: December 1, 2011

Dagmar Esser, Saeid Rezaei, Jianzhao Li, Peter R. Herman, and Jens Gottmann, "Time dynamics of burst-train filamentation assisted femtosecond laser machining in glasses," Opt. Express 19, 25632-25642 (2011)

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