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Development of an integrated near-IR astrophotonic spectrograph

Gatkine, Pradip and Sitaram, Meghna and Veilleux, Sylvain and Dagenais, Mario and Bland-Hawthorn, Joss (2020) Development of an integrated near-IR astrophotonic spectrograph. In: Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV. Proceedings of SPIE. No.11451. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 114516L. ISBN 9781510636897. https://resolver.caltech.edu/CaltechAUTHORS:20201218-120409560

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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.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.2561748DOIArticle
Additional Information:© 2020 Society of Photo-Optical Instrumentation Engineers (SPIE). The authors thank the University of Maryland NanoCenter for the fabrication expertise and the astrophotonics group at University of Sydney and Maquarie University for providing valuable advice. The authors acknowledge the financial support for this project from the W. M. Keck Foundation, National Science Foundation, and NASA.
Funders:
Funding AgencyGrant Number
W. M. Keck FoundationUNSPECIFIED
NSFUNSPECIFIED
NASAUNSPECIFIED
Subject Keywords:Photonic spectrograph, Arrayed Waveguide Gratings, Photonic Lanterns, Integrated Spectrograph, Near-IR, Cross-dispersion
Series Name:Proceedings of SPIE
Issue or Number:11451
Record Number:CaltechAUTHORS:20201218-120409560
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20201218-120409560
Official 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
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107201
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:18 Dec 2020 20:12
Last Modified:18 Dec 2020 20:12

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