Proto-Model of an Infrared Wide-Field Off-Axis Telescope
Sanghyuk Kim (1, 2), Soojong Pak (2), Seunghyuk Chang (3), Geon Hee, Kim (1), Sun Choel Yang (1), Myung Sang Kim (1), Sungho Lee (4, 5) and, Hanshin Lee (5) ((1) Korea Basic Science Institute, Daejeon, South Korea, (2), Kyung Hee University, Yongin-si, South Korea

TL;DR
This paper presents a prototype of an off-axis infrared wide-field telescope with a simple two-mirror design, demonstrating its manufacturing, alignment, and imaging capabilities for potential mid-infrared applications.
Contribution
The paper introduces a novel off-axis Schwarzschild-Chang type telescope prototype with practical manufacturing and alignment procedures for infrared wide-field observations.
Findings
Successful fabrication and surface analysis of off-axis mirrors
Effective alignment using ray tracing methods
Basic imaging test confirms system performance
Abstract
We develop a proto-model of an off-axis reflective telescope for infrared wide-field observations based on the design of Schwarzschild-Chang type telescope. With only two mirrors, this design achieves an entrance pupil diameter of 50 mm and an effective focal length of 100 mm. We can apply this design to a mid-infrared telescope with a field of view of 8 deg X 8 deg. In spite of the substantial advantages of off-axis telescopes in the infrared compared to refractive or on-axis reflective telescopes, it is known to be difficult to align the mirrors in off-axis systems because of their asymmetric structures. Off-axis mirrors of our telescope are manufactured at the Korea Basic Science Institute (KBSI). We analyze the fabricated mirror surfaces by fitting polynomial functions to the measured data. We accomplish alignment of this two-mirror off-axis system using a ray tracing method. A…
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