Development of an integrated near-IR astrophotonic spectrograph

Pradip Gatkine; Meghna Sitaram; Sylvain Veilleux; Mario Dagenais; Joss Bland-Hawthorn

doi:10.1117/12.2561748

13 December 2020 Development of an integrated near-IR astrophotonic spectrograph

Pradip Gatkine, Meghna Sitaram, Sylvain Veilleux, Mario Dagenais, Joss Bland-Hawthorn

Proceedings Volume 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV; 114516L (2020) https://doi.org/10.1117/12.2561748
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

Here, we present an astrophotonic spectrograph in the near-IR H-band (1.45 -1.65 μm) and a spectral resolution (λ/δλ) of 1500. The main dispersing element of the spectrograph is a photonic chip based on Arrayed-Waveguide- Grating technology. The 1D spectrum produced on the focal plane of the AWG contains overlapping spectral orders, each spanning a 10 nm band in wavelength. These spectral orders are cross-dispersed in the perpendicular direction using a cross-dispersion setup which consists of collimating lenses and a prism and the 2D spectrum is thus imaged onto a near-IR detector. Here, as a proof of concept, we use a few-mode photonic lantern to capture the light and feed the emanating single-mode outputs to the AWG chip for dispersion. The total size of the setup is 50 cm x 30 cm x 20 cm³, nearly the size of a shoebox. This spectrograph will pave the way for future miniaturized integrated photonic spectrographs on large telescopes, particularly for building future photonic multi-object spectrographs.

Citation Download Citation

Pradip Gatkine, Meghna Sitaram, Sylvain Veilleux, Mario Dagenais, and Joss Bland-Hawthorn "Development of an integrated near-IR astrophotonic spectrograph", Proc. SPIE 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV, 114516L (13 December 2020); https://doi.org/10.1117/12.2561748

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