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Proceedings Paper

Tailored fiber Bragg gratings inscribed with a phase mask and a deformed wave front by ultrashort pulses
Author(s): Ria G. Becker; Christian Voigtländer; Jens Thomas; Daniel Richter; Anshuman Singh; Andreas Tünnermann; Stefan Nolte
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Paper Abstract

We report on the ultrashort pulse inscription of chirped fiber Bragg gratings (FBG) using a constant phase mask and a deformed wave front. To analyze the influence of wave front deformations on the grating period, a numerical model was developed. It is based on a ray optical solution of the diffraction of an arbitrary wave front at a phase mask with a constant period, where the wave front is described by Zernike polynomials. Generally, a plane wave front generates an interference pattern with half the phase mask period. A defocus changes the grating period, while higher order aberrations like coma or spherical aberration yield a chirp along the inscribed grating. Additionally, the grating period depends on the distance of phase mask and fiber. To experimentally deform the wave front of the inscription beam, a cylindrical tuning lens was introduced to the setup. Due to decentering and tilting of the tuning lens, higher order aberrations were generated. Furthermore the fiber was tilted with respect to the phase mask. A chirped FBG with a FWHM bandwidth of 6.2 nm was realized.

Paper Details

Date Published: 15 February 2012
PDF: 7 pages
Proc. SPIE 8237, Fiber Lasers IX: Technology, Systems, and Applications, 82372H (15 February 2012); doi: 10.1117/12.909922
Show Author Affiliations
Ria G. Becker, Friedrich-Schiller-Univ. Jena (Germany)
Christian Voigtländer, Friedrich-Schiller-Univ. Jena (Germany)
Jens Thomas, Friedrich-Schiller-Univ. Jena (Germany)
Daniel Richter, Friedrich-Schiller-Univ. Jena (Germany)
Anshuman Singh, Friedrich-Schiller-Univ. Jena (Germany)
Andreas Tünnermann, Friedrich-Schiller-Univ. Jena (Germany)
Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Stefan Nolte, Friedrich-Schiller-Univ. Jena (Germany)
Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)

Published in SPIE Proceedings Vol. 8237:
Fiber Lasers IX: Technology, Systems, and Applications
Eric C. Honea; Sami T. Hendow, Editor(s)

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