Mosaicked echelle grating support for the Hectochelle fiber-fed spectrograph

被引：1

作者：

Cheimets, P ^{[1
]}

Szentgyorgyi, AH ^{[1
]}

Pieri, MR ^{[1
]}

机构：

[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

来源：

OPTICAL ASTRONOMICAL INSTRUMENTATION, PTS 1 AND 2 | 1998年 / 3355卷

关键词：

echelle grating; mosaicked grating; optical alignment;

D O I：

10.1117/12.316749

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

This paper presents the design of an assembly to support the Hectochelle multi-object spectrograph grating. The grating consists of two mosaicked, 420mm by 320mm by 74mm thick, 110 line/mm echelle grating segments, nominally operated at a 72 degrees angle of incidence. The fact that the grating consists of 2 segments that must be co-aligned to within 0.27 arcsecs creates a challenging design problem. After much preliminary examination, two support designs were studied, one utilizing Invar, and the other, selected for development, using a Zerodur support structure. The trade study to select the final design is discussed. The Zerodur design was selected because it maintained higher grating stability throughout the operating temperature range than the Invar design. The Zerodur design concept is discussed in detail, including the results of finite element modeling that shows system feasibility.

引用

页码：333 / 342

页数：4