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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 17 — Aug. 15, 2011
  • pp: 16390–16400

Ultrafast ablation dynamics in fused silica with a white light beam probe

Ping-Han Wu, Xuan-Yu Yu, Chung-Wei Cheng, Che-Hao Liao, Shih-Wei Feng, and Hsiang-Chen Wang  »View Author Affiliations

Optics Express, Vol. 19, Issue 17, pp. 16390-16400 (2011)

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This study demonstrates a non-degenerate pump-probe spectroscopy with a white light beam probe based on a regenerative, amplified, mode-locked, Ti:sapphire laser. This white light beam probe is produced by supercontinuum generation of sapphire crystal after ultra-short pulse excitation. To implement the pump-probe experimental operation, the ablation dynamics with and without fresh spot measurements in fused silica samples are demonstrated. Combining the time-resolved differential reflection profiles in the white light range and X-ray photoelectron spectroscopy spectra of fused silica, the following ablation dynamics processes can be observed: Without fresh spot measurements, once carriers are excited, first, the three absorption bands of the intrinsic defect sites are observed within 750 fs. Then, a fast recovery is observed. This recovery comes from defect-trapped carriers excited to conduction bands through hot-carrier-phonon interactions. In the final step, a rapidly rising signal is observed after 800 fs. This signal rise comes from the creation of free-electron plasma, the density of which increases with increasing excitation energy accumulation. With fresh spot measurements, time delay of carrier dynamics among the three bands can be identified clearly within 750 fs. The intrinsic defect sites of fused silica play the key role during the ultrafast laser ablation process.

© 2011 OSA

OCIS Codes
(140.3440) Lasers and laser optics : Laser-induced breakdown
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors
(320.7150) Ultrafast optics : Ultrafast spectroscopy

ToC Category:
Ultrafast Optics

Original Manuscript: June 22, 2011
Revised Manuscript: July 18, 2011
Manuscript Accepted: July 25, 2011
Published: August 10, 2011

Ping-Han Wu, Xuan-Yu Yu, Chung-Wei Cheng, Che-Hao Liao, Shih-Wei Feng, and Hsiang-Chen Wang, "Ultrafast ablation dynamics in fused silica with a white light beam probe," Opt. Express 19, 16390-16400 (2011)

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