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2 March 2020 High contrast ultrashort pulse written transmission filter based on Moiré fiber grating
Ria G. Krämer, Bennet Fischer, Christian Matzdorf, Thorsten A. Goebel, Daniel Richter, Roberto Morandotti, Stefan Nolte
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Proceedings Volume 11270, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XX; 112700V (2020) https://doi.org/10.1117/12.2543817
Event: SPIE LASE, 2020, San Francisco, California, United States
Abstract
We present narrowband and high contrast ultrashort pulse written phase shifted fiber Bragg gratings (FBG). The phase shift in the fiber was implemented by overlaying two spectrally slightly differing gratings, resulting in a Moiré grating. They were realized using the phase mask scanning technique, providing a reliable and reproducible inscription process. The different grating periods were implemented by controlling the applied strain on the fiber during inscription which was monitored spectrally. We present the results of single and multiple phase shift gratings with passband bandwidths as low as 4 pm and contrasts as high as 42 dB.
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Ria G. Krämer, Bennet Fischer, Christian Matzdorf, Thorsten A. Goebel, Daniel Richter, Roberto Morandotti, and Stefan Nolte "High contrast ultrashort pulse written transmission filter based on Moiré fiber grating", Proc. SPIE 11270, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XX, 112700V (2 March 2020); https://doi.org/10.1117/12.2543817
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KEYWORDS
Fiber Bragg gratings
Phase shifts
Optical filters
Femtosecond phenomena
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