Toroidal variable-line-space gratings: the good, the bad, and the ugly

Edward West; Ken Kobayashi; Jonathan Cirtain; Allen Gary; John Davis; Joseph Reader

doi:10.1117/12.825709

21 August 2009 Toroidal variable-line-space gratings: the good, the bad, and the ugly

Edward West, Ken Kobayashi, Jonathan Cirtain, Allen Gary, John Davis, Joseph Reader

Proceedings Volume 7433, Optical System Alignment, Tolerancing, and Verification III; 74330I (2009) https://doi.org/10.1117/12.825709
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

Toroidal variable-line-space (VLS) gratings are very important in the design of an efficient VUV solar telescope that will measure the CIV (155nm) and MgII (280nm) emissions lines in the Sun's transition region. In 1983 Kita and Harada described spherical VLS gratings but the technology to commercially fabricate these devices is a recent development, especially for toroidal surfaces. This paper will describe why this technology is important in the development of the Solar Ultraviolet Magnetograph Investigation (SUMI) sounding rocket program (the good), the delays due to the conversion between the TVLS grating design and the optical fabrication (the bad), and finally the optical testing, alignment and tolerancing of the gratings (the ugly).

Citation Download Citation

Edward West, Ken Kobayashi, Jonathan Cirtain, Allen Gary, John Davis, and Joseph Reader "Toroidal variable-line-space gratings: the good, the bad, and the ugly", Proc. SPIE 7433, Optical System Alignment, Tolerancing, and Verification III, 74330I (21 August 2009); https://doi.org/10.1117/12.825709

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KEYWORDS

Optical design

Optical alignment

Tolerancing

Current controlled current source

Optical fabrication equipment

Optical instrument design

Solar telescopes

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