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  4. Femtosecond inscription of semi-aperiodic multi-notch fiber Bragg gratings using a phase mask
 
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2020
Journal Article
Title

Femtosecond inscription of semi-aperiodic multi-notch fiber Bragg gratings using a phase mask

Abstract
We present an innovative concept of a semi-aperiodic phase mask design that enables the realization of multi-notch fiber Bragg gratings (FBG). This design utilizes the overlap and interference of near-infrared ultrashort laser pulses diffracted by short sequenced phase mask sections, which not only allows for a highly stable and reproducible inscription of a large number of wavelength filters but also paves the way towards full aperiodic phase masks. The semi-aperiodic FBG inscribed by this phase mask enables versatile notch filters showing multiple non-equidistant resonances. Those filters target applications, for instance in ground-based telescopes, where a large number of hydroxyl emission lines emitted in the upper atmosphere at near-infrared wavelengths restrict the observation of faint extraterrestrial objects.
Author(s)
Goebel, T.A.
Heusinger, M.
Krämer, R.G.
Matzdorf, C.
Imogore, T.O.
Richter, D.
Zeitner, U.D.
Nolte, S.
Journal
Optics Express  
Open Access
DOI
10.1364/OE.405498
Language
English
Fraunhofer-Institut für Angewandte Optik und Feinmechanik IOF  
Keyword(s)
  • Fiber Bragg Gratings

  • infrared devices

  • ultrafast lasers

  • ultrashort pulses

  • upper atmosphere

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