A wide field-of-view crossed Dragone optical system using the anamorphic aspherical surfaces

TL;DR

This paper presents a novel wide field-of-view crossed Dragone optical system with anamorphic aspherical surfaces, achieving high image quality and polarization performance suitable for CMB polarization measurements in a compact design.

Contribution

The design introduces anamorphic aspherical correction up to 10th order for a wide FOV crossed Dragone telescope, optimizing image quality and polarization properties for CMB observations.

Findings

Achieved Strehl ratio > 0.95 over 32° by 18° at 150 GHz

System is diffraction-limited below 400 GHz

Maintains uniform point spread function and telecentricity across the field

Abstract

A side-fed crossed Dragone telescope provides a wide field-of-view. This type of a telescope is commonly employed in the measurement of cosmic microwave background (CMB) polarization, which requires an image-space telecentric telescope with a large focal plane over broadband coverage. We report the design of the wide field-of-view crossed Dragone optical system using the anamorphic aspherical surfaces with correction terms up to the 10th order. We achieved the Strehl ratio larger than 0.95 over 32 by 18 square degrees at 150 GHz. This design is an image-space telecentric and fully diffraction-limited system below 400 GHz. We discuss the optical performance in the uniformity of the axially symmetric point spread function and telecentricity over the field-of-view. We also address the analysis to evaluate the polarization properties, including the instrumental polarization, extinction rate, and polarization angle rotation. This work is a part of programs to design a compact multi-color wide field-of-view telescope for LiteBIRD, which is a next generation CMB polarization satellite.