Juhee Lim

FOCAL REDUCER FOR CQUEAN (Camera for QUasars in EArly uNiverse)

A focal reducer is developed for CQUEAN (Camera for QUasars in EArly uNiverse), which is a CCD imaging system on the 2.1 m Otto Struve telescope at the McDonald observatory. It allows CQUEAN to secure a wider field of view by reducing the effective focal length by a factor of three. The optical point spread function without seeing effects is designed to be within one pixel (0.28300´´) over the field of view of 4.820´ × 4.820´ in optimum wavelength ranges of 0.8 ? 1.1 μm. In this paper, we describe and discuss the characteristics of optical design, the lens and barrel fabrications and the alignment processes. The observation results show that the image quality of the focal reducer confirms the expectations from the design.

Optical Design of a Reflecting Telescope for CubeSat

Space telescope optics is one of the major parts of any space mission used to observe astronomical targets or the Earth. This kind of space mission typically involves bulky and complex opto-mechanics with a long optical tube, but attempts have been made to observe a target with a small satellite. In this paper, we describe the optical design of a reflecting telescope for use in a CubeSat mission. For this design we adopt the off-axis segmented method for astronomical observation techniques based on a Ritchey-Chr

Design and development of a wide field telescope

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Camera for Quasars in Early Universe (CQUEAN)

tien type telescope. The primary mirror shape is a rectangle with dimensions of

Camera for Quasars in Early Universe

8cm{\times}8cm

Sensitivity analysis of a wide-field telescope

, and the secondary mirror has dimensions of

Image motion analyses of a wide field telescope

2.4cm{\times}4.1cm

Infrared Medium-Deep Survey : Overview

. The focal ratio is 3 which can yield a 0.383 degree diagonal angle in a

Cryogenic Thermal Cycling Test on IGRINS cross-disperser VPH Grating

1280{\times}800

Focal Reducer for McDonald Otto Struve Telescope

CMOS color image sensor with a pixel size of