Development of micro-mirror slicer integral field unit for space-borne solar spectrographs

被引：5

作者：

Suematsu Y. ^{[1
]}

Saito K. ^{[2
]}

Koyama M. ^{[2
]}

Enokida Y. ^{[2
]}

Okura Y. ^{[2
]}

Nakayasu T. ^{[2
]}

Sukegawa T. ^{[2
]}

机构：

[1] National Astronomical Observatory of Japan, 21-1 Osawa 2-chome, Mitaka, 181-8588, Tokyo

[2] Canon Inc., 30-2, Shimomaruko 3-chome, Ohta-ku, Tokyo

来源：

CEAS Space Journal | 2017年 / 9卷 / 04期

关键词：

Image slicer; Integral field spectroscopy; Integral field unit; Micro image slicer;

D O I：

10.1007/s12567-017-0157-5

中图分类号：

学科分类号：

摘要：

We present an innovative optical design for image slicer integral field unit (IFU) and a manufacturing method that overcomes optical limitations of metallic mirrors. Our IFU consists of a micro-mirror slicer of 45 arrayed, highly narrow, flat metallic mirrors and a pseudo-pupil-mirror array of off-axis conic aspheres forming three pseudo slits of re-arranged slicer images. A prototype IFU demonstrates that the final optical quality is sufficiently high for a visible light spectrograph. Each slicer micro-mirror is 1.58 mm long and 30 μ m wide with surface roughness ≤ 1 nm rms, and edge sharpness ≤ 0.1 μ m, etc. This IFU is small size and can be implemented in a multi-slit spectrograph without any moving mechanism and fore optics, in which one slit is real and the others are pseudo slits from the IFU. The IFU mirrors were deposited by a space-qualified, protected silver coating for high reflectivity in visible and near IR wavelength regions. These properties are well suitable for space-borne spectrograph such as the future Japanese solar space mission SOLAR-C. We present the optical design, performance of prototype IFU, and space qualification tests of the silver coating. © 2017, CEAS.

引用

页码：421 / 431

页数：10

共 19 条

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