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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 4 — Feb. 25, 2013
  • pp: 4493–4502

Femtosecond laser writing of optical edge filters in fused silica optical waveguides

Jason R. Grenier, Luís A. Fernandes, and Peter R. Herman  »View Author Affiliations

Optics Express, Vol. 21, Issue 4, pp. 4493-4502 (2013)

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The positional alignment of femtosecond laser written Bragg grating waveguides within standard and coreless optical fiber has been exploited to vary symmetry and open strong optical coupling to a high density of asymmetric cladding modes. This coupling was further intensified with tight focusing of the laser pulses through an oil-immersion lens to control mode size against an asymmetric refractive index profile. By extending this Bragg grating waveguide writing into bulk fused silica glass, strong coupling to a continuum of radiation-like modes facilitated a significant broadening to over hundreds of nanometers bandwidth that blended into the narrow Bragg resonance to form into a strongly isolating (43 dB) optical edge filter. This Bragg resonance defined exceptionally steep edge slopes of 136 dB/nm and 185 dB/nm for unpolarized and linearly polarized light, respectively, that were tunable through the 1450 nm to 1550 nm telecommunication band.

© 2013 OSA

OCIS Codes
(140.3390) Lasers and laser optics : Laser materials processing
(230.1480) Optical devices : Bragg reflectors
(230.3120) Optical devices : Integrated optics devices
(130.2755) Integrated optics : Glass waveguides
(230.7408) Optical devices : Wavelength filtering devices

ToC Category:
Laser Microfabrication

Original Manuscript: December 17, 2012
Revised Manuscript: February 1, 2013
Manuscript Accepted: February 2, 2013
Published: February 13, 2013

Jason R. Grenier, Luís A. Fernandes, and Peter R. Herman, "Femtosecond laser writing of optical edge filters in fused silica optical waveguides," Opt. Express 21, 4493-4502 (2013)

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