Tailored fiber Bragg gratings inscribed with a phase mask and a deformed wave front by ultrashort pulses

Ria G. Becker; Christian Voigtländer; Jens Thomas; Daniel Richter; Anshuman Singh; Andreas Tünnermann; Stefan Nolte

doi:10.1117/12.909922

15 February 2012 Tailored fiber Bragg gratings inscribed with a phase mask and a deformed wave front by ultrashort pulses

Ria G. Becker, Christian Voigtländer, Jens Thomas, Daniel Richter, Anshuman Singh, Andreas Tünnermann, Stefan Nolte

Author Affiliations +

Proceedings Volume 8237, Fiber Lasers IX: Technology, Systems, and Applications; 82372H (2012) https://doi.org/10.1117/12.909922
Event: SPIE LASE, 2012, San Francisco, California, United States

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.

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Ria G. Becker, Christian Voigtländer, Jens Thomas, Daniel Richter, Anshuman Singh, Andreas Tünnermann, and Stefan Nolte "Tailored fiber Bragg gratings inscribed with a phase mask and a deformed wave front by ultrashort pulses", Proc. SPIE 8237, Fiber Lasers IX: Technology, Systems, and Applications, 82372H (15 February 2012); https://doi.org/10.1117/12.909922

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KEYWORDS

Wavefronts

Fiber Bragg gratings

Diffraction

Diffraction gratings

Ultrafast phenomena

Monochromatic aberrations

Fiber lasers

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