High-contrast imaging has been used to discover and characterize dozens of exoplanets to date. The primary limiting performance factor for these instruments is contrast, the ratio of exoplanet to host star brightness that an instrument can successfully resolve. Contrast is largely determined by wavefront error, consisting of uncorrected atmospheric turbulence and optical aberrations downstream of AO correction. Single-point diamond turning allows for high-precision optics to be manufactured for use in astronomical instrumentation, presenting a cheaper and more versatile alternative to conventional glass polishing. This work presents measurements of wavefront error for diamond-turned aluminum optics in the Slicer Combined with an Array of Lenslets for Exoplanet Spectroscopy (SCALES) instrument, a 2-5 micron coronagraphic integral field spectrograph under construction for Keck Observatory. Wavefront error measurements for these optics are used to simulate SCALES' point spread function using physical optics propagation software poppy, showing that SCALES' contrast performance is not limited by wavefront error from internal instrument optics.
@article{arxiv.2310.11592,
title = {Characterization of diamond-turned optics for SCALES},
author = {Isabel J. Kain and Phil Hinz and Marius Doetz and Benjamin Bulla and Renate Kupke and Daren Dillon and Andrew Skemer and Deno Stelter and Michael Gonzales and Nicholas MacDonald and Aditi Gangadharan and Cristian Rodriguez and Christopher Ratliff and Mackenzie R. Lach and Steph Sallum},
journal= {arXiv preprint arXiv:2310.11592},
year = {2023}
}
Comments
Techniques and Instrumentation for Detection of Exoplanets XI