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We have developed narrow-bandpass MoSi/Si multilayer mirrors for a Japanese sounding-rocket program. A high spectral resolution λ/Δλ exceeding 40 was achieved by a two-mirror telescope with a multilayer coating. The single telescope had two bandpasses in the extreme-UV range for detecting a coronal high-velocity flow; the wavelength at peak reflectance (hereafter peak wavelength) in one of the bandpasses was 210.2 Å, situated on the blue side of the target’s Fe xiv 211.3-Å coronal emission line, and the peak wavelength in the other was 213.3 Å on the red side. A high uniformity in a peak wavelength of less than 1 Å was achieved over a primary (secondary) mirror surface 158 (96) mm in diameter. The ratio of the reflectance for the Fe xiv line at 211 Å to that for an intense He ii line as a contaminant at 304 Å in the telescope system became 2 × 105 owing to a wave trap consisting of a single Si layer on the MoSi/Si multilayer. The narrow-bandpass (∼5-Å) telescope was launched on 31 January 1998 by sounding rocket S520CN-22, and images of the whole-Sun corona at Fe xiv 211 Å were successfully obtained.
© 1999 Optical Society of America
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