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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 19 — Sep. 19, 2005
  • pp: 7288–7297

Influence of diffraction by a rectangular aperture on the aspect ratio of femtosecond direct-write waveguides

K.J. Moh, Y.Y. Tan, X.-C. Yuan, D.K.Y. Low, and Z.L. Li  »View Author Affiliations

Optics Express, Vol. 13, Issue 19, pp. 7288-7297 (2005)

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Rectangular apertures have been used as a simple means to approximate elliptical Gaussian beams in femtosecond direct writing systems to correct for the elongated focus inherent in low numerical aperture (NA) systems. In this work it is recognized that the rectangular aperture, more accurately functions as a diffractive element and hence redistributes the intensity gradient around the focus in accordance to the physical effects of diffraction. A diffractive model for the technique was proposed and confirmed experimentally to investigate the effects of diffraction and the extent of its influence on the focus shape over different conditions. It was found that because of diffraction, the radius of curvature for the leading edge of the focal spot is dissimilar from its trailing edge. However this effect is mitigated when lower processing energy is used and circular waveguides can be obtained.

© 2005 Optical Society of America

OCIS Codes
(050.1960) Diffraction and gratings : Diffraction theory
(160.2750) Materials : Glass and other amorphous materials
(220.4000) Optical design and fabrication : Microstructure fabrication
(320.2250) Ultrafast optics : Femtosecond phenomena

ToC Category:
Research Papers

Original Manuscript: August 8, 2005
Revised Manuscript: August 24, 2005
Published: September 19, 2005

K. Moh, Y. Tan, X.-C. Yuan, D. Low, and Z. Li, "Influence of diffraction by a rectangular aperture on the aspect ratio of femtosecond direct-write waveguides," Opt. Express 13, 7288-7297 (2005)

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