Semi-aperiodic fiber Bragg gratings for hydroxyl emission line suppression

Thorsten A. Goebel; Martin Heusinger; Daniel Richter; Ria G. Krämer; Timothy O. Imogore; Christian Matzdorf; Maximilian Heck; Uwe D. Zeitner; Stefan Nolte

doi:10.1117/12.2562029

13 December 2020 Semi-aperiodic fiber Bragg gratings for hydroxyl emission line suppression

Thorsten A. Goebel, Martin Heusinger, Daniel Richter, Ria G. Krämer, Timothy O. Imogore, Christian Matzdorf, Maximilian Heck, Uwe D. Zeitner, Stefan Nolte

Author Affiliations +

Proceedings Volume 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV; 1145122 (2020) https://doi.org/10.1117/12.2562029
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

Atmospheric emission limits observation with ground-based telescopes in the NIR. Those emission lines are very narrow in bandwidth and thus enable for filtering them with fiber Bragg gratings to utilize the light passing in-between. We present a scheme for the compact inscription of multiple notch filters with a semi-aperiodic fiber Bragg grating. Herein, we utilize the interference of neighboring grating sections of a phase mask which then produces the desired resonances inside a fiber. Our current design addresses up to ten wavelengths which are matched with an accuracy better than 175pm.

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Thorsten A. Goebel, Martin Heusinger, Daniel Richter, Ria G. Krämer, Timothy O. Imogore, Christian Matzdorf, Maximilian Heck, Uwe D. Zeitner, and Stefan Nolte "Semi-aperiodic fiber Bragg gratings for hydroxyl emission line suppression", Proc. SPIE 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV, 1145122 (13 December 2020); https://doi.org/10.1117/12.2562029

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