A complex multi-notch astronomical filter to suppress the bright infrared sky
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Citation
Bland-Hawthorn, J., Ellis, S.C., Leon-Saval, S.G., Haynes, R., Roth, M.M., Löhmannsröben, H.-G., Horton, A.J., Cuby, J.-G., Birks, T.A., Lawrence, J.S., Gillingham, P., Ryder, S.D., & Trinh, C. (2011). A complex multi-notch astronomical filter to suppress the bright infrared sky. Nature Communications, 2(581), 1-8. doi: 10.1038/ncomms1584
Keywords
- Astronomical filter
- Infrared Astronomy
- Night Sky Brightness
- Hydroxyl Emission Lines (OH lines)
- Sky Suppression
- Multi-notch Filter
- Fibre Bragg Grating (FBG)
- Photonic Lantern
- Spectroscopy
- Early Universe
- Telescopes (8m and 30m)
- Astronomical Instruments
- Throughput
- Mode Matching
- Microlens Array
- Multi-core Fibres
Brief
This article describes the development and testing of a complex multi-notch filter utilizing fibre Bragg grating and photonic lantern technologies to suppress bright hydroxyl emission lines in the infrared night sky, enabling deeper astronomical observations.
Summary
This article presents a new astronomical filter that combines fibre Bragg grating (FBG) and photonic lantern technologies to suppress the bright infrared night sky caused by hydroxyl emission lines. This innovation enables much deeper near-infrared observations crucial for studying the early Universe with current and future large telescopes by selectively removing the unwanted light while maintaining high transmission in between the lines. The on-sky tests demonstrated the effective removal of these bright lines.
Origin: https://nature.66557.net/articles/ncomms1584