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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 16 — Aug. 6, 2007
  • pp: 10149–10153

Refractive index modification using fs-laser double pulses

Dirk Wortmann, Mark Ramme, and Jens Gottmann  »View Author Affiliations

Optics Express, Vol. 15, Issue 16, pp. 10149-10153 (2007)

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Buried waveguides in glass are manufactured by irradiation with femtosecond laser double pulses. The refractive index change Δn is determined by measuring the numerical aperture NA of the waveguides and by through light microscopy. The value of Δn shows a significant dependency on the time delay Δt of the fs-laser double pulses. A Δn of up to 2×10-3 in fused silica is reached at a Δt between 400 and 800 ps. Based on the results of the double pulse experiments the initial effects of the refractive index change are discussed, taking into account thermal effects and the formation of self trapped excitons (STE) and transient color centers and their interaction with the next laser pulse.

© 2007 Optical Society of America

OCIS Codes
(130.2790) Integrated optics : Guided waves
(230.7370) Optical devices : Waveguides
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors

ToC Category:
Integrated Optics

Original Manuscript: March 30, 2007
Revised Manuscript: July 17, 2007
Manuscript Accepted: July 21, 2007
Published: July 27, 2007

Dirk Wortmann, Mark Ramme, and Jens Gottmann, "Refractive index modification using fs-laser double pulses," Opt. Express 15, 10149-10153 (2007)

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