Development of an integrated near-IR astrophotonic spectrograph
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.
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.Attached Files
Published - 114516L.pdf
Accepted Version - 2203.07868.pdf
Presentation - SPIE-AS20-d4c5619b-9505-ea11-813b-005056be78dc.pdf
Files
Additional details
- Eprint ID
- 107201
- Resolver ID
- CaltechAUTHORS:20201218-120409560
- W. M. Keck Foundation
- NSF
- NASA
- Created
-
2020-12-18Created from EPrint's datestamp field
- Updated
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2022-06-30Created from EPrint's last_modified field
- Series Name
- Proceedings of SPIE
- Series Volume or Issue Number
- 11451