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http://dx.doi.org/10.3807/KJOP.2017.28.3.108

Assembly and Testing of a Visible and Near-infrared Spectrometer with a Shack-Hartmann Wavefront Sensor  

Hwang, Sung Lyoung (Department of Optical Engineering, Kongju National University)
Lee, Jun Ho (Department of Optical Engineering, Kongju National University)
Jeong, Do Hwan (Department of Optical Engineering, Kongju National University)
Hong, Jin Suk (Hanwha Systems)
Kim, Young Soo (Hanwha Systems)
Kim, Yeon Soo (Agency for Defense Development)
Kim, Hyun Sook (Agency for Defense Development)
Publication Information
Korean Journal of Optics and Photonics / v.28, no.3, 2017 , pp. 108-115 More about this Journal
Abstract
We report the assembly procedure and performance evaluation of a visible and near-infrared spectrometer in the wavelength region of 400-900 nm, which is later to be combined with fore-optics (a telescope) to form a f/2.5 imaging spectrometer with a field of view of ${\pm}7.68^{\circ}$. The detector at the final image plane is a $640{\times}480$ charge-coupled device with a $24{\mu}m$ pixel size. The spectrometer is in an Offner relay configuration consisting of two concentric, spherical mirrors, the secondary of which is replaced by a convex grating mirror. A double-pass test method with an interferometer is often applied in the assembly process of precision optics, but was excluded from our study due to a large residual wavefront error (WFE) in optical design of 210 nm ($0.35{\lambda}$ at 600 nm) root-mean-square (RMS). This results in a single-path test method with a Shack-Hartmann sensor. The final assembly was tested to have a RMS WFE increase of less than 90 nm over the entire field of view, a keystone of 0.08 pixels, a smile of 1.13 pixels and a spectral resolution of 4.32 nm. During the procedure, we confirmed the validity of using a Shack-Hartmann wavefront sensor to monitor alignment in the assembly of an Offner-like spectrometer.
Keywords
Spectrometer; Imaging spectrometer; Offner relay; Shack-Hartmann sensor; Visible & Near-Infrared (VNIR);
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