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18 July 2024 Arrayed waveguide grating based photonic spectrograph for the astronomical J band
V. Gopinath, O. Pfuhl, S. Lewis, S. Lévêque, N. Hubin, F. Eisenhauer, G. Bourdarot
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Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 13096AB (2024) https://doi.org/10.1117/12.3016180
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan
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Abstract
The tremendous costs and complexity of instruments for the next generation of telescopes (ELT, GMT, TMT) has led to increasing research into photonic devices as cheaper and compact alternatives to bulk optic components. The widespread availability of adaptive optics and diffraction-limited image quality of telescopes in the infrared enables the use of single-mode photonic devices. A possible single-mode counterpart to conventional, bulk optic spectrographs are photonic spectrographs, based e.g. on arrayed waveguide gratings (AWG). AWGs are widely used in the telecommunication industries for wavelength multiplexing and demultiplexing. As a result, commercial AWGs are typically operated around the 1550nm communication window and their potential application as an astrophotonic spectrograph has been studied mainly in the astronomical H band (1500-1700 nm). In order to extend the wavelength range, we developed an AWG for the astronomical J band (center wavelength 1250 nm). The device was ordered for fabrication and was characterized using a test bench built in-house. The AWG chip is found to exhibit spectral resolutions close to the design resolution (R∼12500) over a large wavelength range from at least 1150nm to 1500 nm, with an intrinsic peak transmission close to 80% at the center wavelength. Our results demonstrate the potential to use AWG’s in astronomical spectrographs in future instruments.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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V. Gopinath, O. Pfuhl, S. Lewis, S. Lévêque, N. Hubin, F. Eisenhauer, and G. Bourdarot "Arrayed waveguide grating based photonic spectrograph for the astronomical J band", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 13096AB (18 July 2024); https://doi.org/10.1117/12.3016180
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KEYWORDS
Arrayed waveguide gratings
Waveguides
Spectrographs
Astronomy
Spectral resolution
Chip manufacturing
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