Active optics and deformed toroid concave gratings: higher order aspherizations

Details Active optics and deformed toroid concave gratings: higher order aspherizations Active optics and deformed toroid concave gratings: higher order aspherizations

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...271..365w&link_type=abstract

Astronomy and Astrophysics, Vol. 271, p. 365 (1993)

Physics

Optics

2

Active Optics, Optical Design, Instrumentation, Faint Object Spectroscopy, High Resolution Spectroscopy

Scientific paper

The development of plane-aspherical gratings for faint object spectroscopy has proved the possibility of correcting aberrations in reflective spectrograph designs. For high resolution spectroscopy and moderate spectral ranges, investigation with concave gratings has led us to develop flexible submasters capable to generate toroid gratings from active optics and replication. Such gratings allow simultaneous achievement of dispersion, beam convergence and aberration correction, thus leading to high- throughput spectrograph designs. This is particularly useful for UV and EUV studies. As shown in this paper, corrected concave gratings of high groove density working at magnification M = - 1 and at f-ratios faster than f/l 5, require compensation for high order off-axis aberrations and need to elaborate new-type active submasters. Because the optical figure of these gratings is actively aspherized to compensate for 3rd order Astigmatism and Coma, and 5th order Triangular Astigmatism, one proposes to denote them ACTA corrected gratings. Comparison of various variable spacing lines is investigated and leads to a particular line density.

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