GPI 2.0: Upgrades to the IFS including new spectral modes

TL;DR

This paper details upgrades to the Gemini Planet Imager's Integral Field Spectrograph, including new prisms, filters, and design modifications to enhance spectral resolution, coverage, and performance for exoplanet imaging.

Contribution

It introduces new spectral modes and design improvements for the GPI IFS, enabling broader spectral coverage and better performance.

Findings

Enhanced high-resolution prism for more even spectral dispersion

New low-resolution mode for simultaneous multi-band imaging

Potential performance gains with multiband filter implementation

Abstract

The Gemini Planet Imager (GPI) is a high-contrast imaging instrument designed to directly image and characterize exoplanets. GPI is currently undergoing several upgrades to improve performance. In this paper, we discuss the upgrades to the GPI IFS. This primarily focuses on the design and performance improvements of new prisms and filters. This includes an improved high-resolution prism which will provide more evenly dispersed spectra across y, J, H and K-bands. Additionally, we discuss the design and implementation of a new low-resolution mode and prism which allow for imaging of all four bands (y, J, H and K-bands) simultaneously at R=10. We explore the possibility of using a multiband filter which would block the light between the four spectral bands. We discuss possible performance improvements from the multiband filter, if implemented. Finally we explore the possibility of making small changes to the optical design to improve the IFS's performance near the edge of the field of view.