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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 11, Iss. 15 — Jul. 28, 2003
  • pp: 1809–1816

Optical gratings embedded in photosensitive glass by photochemical reaction using a femtosecond laser

Ya Cheng, Koji Sugioka, Masashi Masuda, Kazuhiko Shihoyama, Koichi Toyoda, and Katsumi Midorikawa  »View Author Affiliations


Optics Express, Vol. 11, Issue 15, pp. 1809-1816 (2003)
http://dx.doi.org/10.1364/OE.11.001809


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Abstract

We describe a new approach to the internal refractive index modification of glass by a femtosecond (fs) laser. The glass we used is a photosensitive glass Foturan which contains trace amounts of silver. Silver nanoparticles, which is responsible for the refractive index change, can be formed in the glass after exposed to the fs laser and then postbaked at an appropriate temperature between 500°C and 550°C. In this work, latent images of grating structures are first inscribed into the photosensitive glass by photochemical reaction of a tightly focused fs laser beam with an intensity much lower than the threshold of optical breakdown. After this step, no measurable diffraction can be observed by irradiating the gratings with a He-Ne laser beam. The samples are then baked at 520°C for various durations from 3h to 18h. Diffraction of the optical grating embedded in the glass can now be observed, and the diffraction efficiency increases with postbaking duration, indicating that a refractive index change occurs in the modified regions. The relationship between the refractive index change and the postbaking duration is systematically investigated.

© 2003 Optical Society of America

OCIS Codes
(140.3390) Lasers and laser optics : Laser materials processing
(140.7090) Lasers and laser optics : Ultrafast lasers

ToC Category:
Research Papers

History
Original Manuscript: June 2, 2003
Revised Manuscript: July 18, 2003
Published: July 28, 2003

Citation
Ya Cheng, Koji Sugioka, Masashi Masuda, Kazuhiko Shihoyama, Koichi Toyoda, and Katsumi Midorikawa, "Optical gratings embedded in photosensitive glass by photochemical reaction using a femtosecond laser," Opt. Express 11, 1809-1816 (2003)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-11-15-1809


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References

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