Abstract
This paper presents a method to derive the theoretical requirements for the
development of a 400 mm optical window that transmits dual-band wavelengths and had
a stable structure. We also present design and fabrication results. Among the
required specifications, the surface figure error was defined by the transmitted
wavefront deformation (TWD), λ/15 rms at 632.8 nm.
This value was derived by estimating the predicted performances with respect to five
independent items that could cause system performance degradation and then
calculating the required wavefront error (WFE) to satisfy the performance goals. We
measured the image resolution at each performance level to trace and verify the
requirements. The article also describes a design optimization process that could
minimize the weight and volume of the optical window attached to the payload
securing the FOV of the camera. In addition, we accurately measured the deformation
that occurred in the series of fabrication steps including processing, coating,
assembly, bonding and bolting, and investigated the effects by comparing them to the
results of a simulation performed in advance to derive the predicted
performance.
© 2012 Optical Society of Korea
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