Fast camera for a spectrograph

Kyoji Nariai; Yoshiya Matsui; Nobuo Nakamura; Katuo Honda; Qingxin Ru

doi:10.1117/12.19121

1 July 1990 Fast camera for a spectrograph

Kyoji Nariai, Yoshiya Matsui, Nobuo Nakamura, Katuo Honda, Qingxin Ru

Proceedings Volume 1235, Instrumentation in Astronomy VII; (1990) https://doi.org/10.1117/12.19121
Event: SPIE Astronomical Telescopes and Instrumentation for the 21st Century, 1990, Tucson, AZ, United States

Abstract

The optical design and fabrication of a fast f/1.4 prototype camera for the JNLT are briefly described. The f/1 semisolid Schmidt-Cassegrain camera configuration (a corrector lens plus two aspheric mirrors) developed by Nariai and Yamashita (1987) on the basis of third-order aberration theory is adopted, but the design is modified to reduce the number of aspheric surfaces from four to two. Computer-controlled polishing achieved accuracy of 150 and 200 nm for the corrector plate and secondary mirror, respectively. The use of a constant-radial-shearing interferometer to test the Schmidt corrector plate is explained, and it is reported that the assembled camera had MTF of 55 percent for 100 lp/mm when imaging a 5-micron slit placed in the focal plane.

Citation Download Citation

Kyoji Nariai, Yoshiya Matsui, Nobuo Nakamura, Katuo Honda, and Qingxin Ru "Fast camera for a spectrograph", Proc. SPIE 1235, Instrumentation in Astronomy VII, (1 July 1990); https://doi.org/10.1117/12.19121

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