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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 20 — Oct. 7, 2013
  • pp: 24049–24059

Absorption mechanism of the second pulse in double-pulse femtosecond laser glass microwelding

Sizhu Wu, Dong Wu, Jian Xu, Haiyu Wang, Testuya Makimura, Koji Sugioka, and Katsumi Midorikawa  »View Author Affiliations

Optics Express, Vol. 21, Issue 20, pp. 24049-24059 (2013)

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The absorption mechanism of the second pulse is experimentally and theoretically investigated for high-efficiency microwelding of photosensitive glass by double-pulse irradiation using a femtosecond laser. The transient absorption change during the second pulse irradiation for various energies induced by the first pulse is measured at different delay times. The resulting effects depend on whether the delay time is 0–30 ps (time domain I) or 30– several ns (domain II). By solving rate equations for the proposed electronic processes, the excitation and relaxation times of free electrons in time domain I are estimated to be 0.98 and 20.4 ps, respectively, whereas the relaxation times from the conduction band to a localized state and from the localized state to the valence band in domain II are 104.2 and 714.3 ps, respectively. Single-photon absorption of the second pulse by free electrons dominates in domain I, resulting in high bonding strength. In time domain II, about 46% of the second pulse is absorbed by a single photon due to the localized state, which is responsible for higher bonding strength compared with that prepared by single-pulse irradiation.

© 2013 OSA

OCIS Codes
(140.3390) Lasers and laser optics : Laser materials processing
(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 Optics

Original Manuscript: July 11, 2013
Revised Manuscript: September 9, 2013
Manuscript Accepted: September 10, 2013
Published: October 1, 2013

Sizhu Wu, Dong Wu, Jian Xu, Haiyu Wang, Testuya Makimura, Koji Sugioka, and Katsumi Midorikawa, "Absorption mechanism of the second pulse in double-pulse femtosecond laser glass microwelding," Opt. Express 21, 24049-24059 (2013)

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