For almost 30 years grazing incidence telescopes for astronomical observations have been developed and matured to low scattering performance. A culmination point was reached with the launch of the X-ray astronomy satellite ROSAT, which is in operation since 2 years. ROSAT carries two grazing incidence telescopes covering the XUV (~50 - 750Å) and the soft X-ray (~5 - 120Å) spectral regions, separately. The Wolter type I X-ray telescope consists of 4 nested mirror pairs with a maximum aperture of 835mm and 2.4m focal length, characterized by a half energy width of <4 arcsec and extremely low scattering wings due to the superb mirror surface microroughness of <2.8Å. The point spread function, which has been measured on ground in a 130m long beam test facility prior to launch, will be compared with the performance obtained in orbit. Future grazing incidence X-ray telescopes aim at improved angular resolution, larger collecting area and broader spectral coverage. This is pursued in various projects including SAX, BBXRT, ASTRO-D, Spectrum-X, SOHO-CDS, AXAF and XMM, requiring new fabrication techniques and metrology.
© 1992 Optical Society of AmericaPDF Article
More Like This
TuR1 OSA Annual Meeting (FIO) 1991
B.A. Tirri, S. Bilodeau, S. Dave, R. Poirier, and P. Slane
OTuA1 Optical Interference Coatings (OIC) 1992
Shuyan Chen, Li Cheng, Yang Zhang, Liping Su, Tao Geng, and Kun Li
104526G Education and Training in Optics and Photonics (ETOP) 2017