Very fast transmissive spectrograph designs for highly multiplexed fiber spectroscopy

TL;DR

This paper presents innovative, ultra-fast transmissive spectrograph designs for highly multiplexed fiber spectroscopy, emphasizing high throughput and compactness for instruments like Hector and MSE.

Contribution

It introduces novel spectrograph designs with extreme aspheres, minimal surfaces, and high throughput suitable for large-scale fiber spectroscopy.

Findings

Designs achieve high throughput with minimal surfaces

Use of extreme aspheres improves imaging performance

Suitable for large multiplexed spectroscopic instruments

Abstract

Very fast (f/1.2 and f/1.35) transmissive spectrograph designs are presented for Hector and MSE. The designs have 61mm x 61mm detectors, 4 or 5 camera lenses of aperture less than 228mm, with just 6 air/glass surfaces, and rely on extreme aspheres for their imaging performance. The throughput is excellent, because of the i-line glasses used, the small number of air/glass surfaces.