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26 August 2024 Novel phase masks with overlapping regions to fabricate fiber Bragg gratings for filtering sky emission lines
Xijie Luo, Aashia Rahman, Kalaga Madhav, Thomas Siefke, Ria G. Krämer, Daniel Richter, Uwe D. Zeitner, Stefan Nolte, Martin M. Roth
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Proceedings Volume 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI; 1310068 (2024) https://doi.org/10.1117/12.3018363
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan
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Abstract
We analyze aperiodic fiber Bragg gratings (FBGs) fabricated using an aperiodic phase mask, involving partial overlaps of distinct mask regions. Multichannel aperiodic FBG filter is a promising candidate for suppressing hydroxyl (OH) emission lines in ground-based near-infrared astronomical observations. However, the fabrication of such multichannel aperiodic FBGs demands high repeatability. We explore the design of phase masks with repeatable FBG inscriptions. Previously, we explored a phase mask (1st generation) designed and fabricated with partial overlapping regions using logical OR operation. Continuing this effort, we investigate three distinct phase mask designs which are capable of generating FBGs corresponding to five OH lines. The first mask features five discrete regions, each producing a specific FBG channel, while the other two masks incorporate numerically obtained overlap regions using logical OR and XOR operations. We present here the performances of the fabricated masks by comparing the Bragg wavelengths and the reflectivities of the inscribed FBGs.
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Xijie Luo, Aashia Rahman, Kalaga Madhav, Thomas Siefke, Ria G. Krämer, Daniel Richter, Uwe D. Zeitner, Stefan Nolte, and Martin M. Roth "Novel phase masks with overlapping regions to fabricate fiber Bragg gratings for filtering sky emission lines", Proc. SPIE 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI, 1310068 (26 August 2024); https://doi.org/10.1117/12.3018363
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KEYWORDS
Fiber Bragg gratings
Design
Fabrication
Optical filters
Astronomy
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