Spectral characterization of 3-port photonic lantern for spectroastrometry

Yoo Jung Kim; Michael P. Fitzgerald; Jonathan Lin; Julien Lozi; Sebastien Vievard; Nemanja Jovanovic; Sergio Leon-Saval; Kyohoon Ahn; Christopher Betters; Vincent Deo; Pradip Gatkine; Olivier Guyon; Manon Lallement; Daniel Levinstein; Dimitri Mawet; Barnaby Norris; Steph Sallum; Yinzi Xin

doi:10.1117/12.3019017

28 August 2024 Spectral characterization of 3-port photonic lantern for spectroastrometry

Yoo Jung Kim, Michael P. Fitzgerald, Jonathan Lin, Julien Lozi, Sebastien Vievard, Nemanja Jovanovic, Sergio Leon-Saval, Kyohoon Ahn, Christopher Betters, Vincent Deo, Pradip Gatkine, Olivier Guyon, Manon Lallement, Daniel Levinstein, Dimitri Mawet, Barnaby Norris, Steph Sallum, Yinzi Xin

Author Affiliations +

Proceedings Volume 13095, Optical and Infrared Interferometry and Imaging IX; 130950T (2024) https://doi.org/10.1117/12.3019017
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

Spectroastrometry, which measures wavelength-dependent shifts in the center of light, is well-suited for studying objects whose morphology changes with wavelength at very high angular resolutions. Photonic lantern (PL)-fed spectrometers have potential to enable measurement of spectroastrometric signals because the relative intensities between the PL output SMFs contain spatial information on the input scene. In order to use PL output spectra for spectroastrometric measurements, it is important to understand the wavelength-dependent behaviors of PL outputs and develop methods to calibrate the effects of time-varying wavefront errors in ground-based observations. We present experimental characterizations of the 3-port PL on the SCExAO testbed at the Subaru Telescope. We develop spectral response models of the PL and verify the behaviors with lab experiments. We find sinusoidal behavior of astrometric sensitivity of the 3-port PL as a function of wavelength, as expected from numerical simulations. Furthermore, we compare experimental and numerically simulated coupling maps and discuss their potential use for offsetting pointing errors and for building PL spectral response models that could be used for further calibration strategies.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yoo Jung Kim, Michael P. Fitzgerald, Jonathan Lin, Julien Lozi, Sebastien Vievard, Nemanja Jovanovic, Sergio Leon-Saval, Kyohoon Ahn, Christopher Betters, Vincent Deo, Pradip Gatkine, Olivier Guyon, Manon Lallement, Daniel Levinstein, Dimitri Mawet, Barnaby Norris, Steph Sallum, and Yinzi Xin "Spectral characterization of 3-port photonic lantern for spectroastrometry", Proc. SPIE 13095, Optical and Infrared Interferometry and Imaging IX, 130950T (28 August 2024); https://doi.org/10.1117/12.3019017

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