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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 4 — Feb. 15, 2012
  • pp: 491–493

Ultrafast laser inscription of Bragg-grating waveguides using the multiscan technique

Graeme Brown, Robert R. Thomson, Ajoy K. Kar, Nicholas D. Psaila, and Henry T. Bookey  »View Author Affiliations

Optics Letters, Vol. 37, Issue 4, pp. 491-493 (2012)

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We report the fabrication of high-strength (>30dB) first order Bragg-grating waveguides in borosilicate glass substrates using ultrafast laser inscription. The cross section of each waveguide was controlled using the well known multiscan fabrication technique, where the desired waveguide cross section is constructed by scanning the sample through the laser focus multiple times. In order to fabricate high-strength gratings, it was therefore necessary to precisely control and spatially synchronize the refractive index modulations imprinted in the material by each scan. The Bragg-grating waveguides were inscribed using a femtosecond fiber laser that was externally modulated using an acousto-optic modulator. The required precision in the laser modulation was thus achieved by triggering the acousto-optic modulator using a position sensitive trigger signal supplied by the substrate translation stages themselves.

© 2012 Optical Society of America

OCIS Codes
(230.1480) Optical devices : Bragg reflectors
(230.7370) Optical devices : Waveguides
(320.2250) Ultrafast optics : Femtosecond phenomena
(350.3390) Other areas of optics : Laser materials processing

ToC Category:
Optical Devices

Original Manuscript: September 28, 2011
Revised Manuscript: December 5, 2011
Manuscript Accepted: December 7, 2011
Published: February 6, 2012

Graeme Brown, Robert R. Thomson, Ajoy K. Kar, Nicholas D. Psaila, and Henry T. Bookey, "Ultrafast laser inscription of Bragg-grating waveguides using the multiscan technique," Opt. Lett. 37, 491-493 (2012)

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