Segmented pupil image stacker and spectrograph for a 28-m telescope

Eric Harvey Richardson

doi:10.1117/12.269026

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21 March 1997 Segmented pupil image stacker and spectrograph for a 28-m telescope

Eric Harvey Richardson

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Proceedings Volume 2871, Optical Telescopes of Today and Tomorrow; (1997) https://doi.org/10.1117/12.269026
Event: Optical Telescopes of Today and Tomorrow, 1996, Landskrona/Hven, Sweden

Abstract

For spectroscopic observations with a segmented mirror 28- meter telescope, an alternative to image slicing of a single composite image is to separate the 141 images and stack the unsliced images from the segments along the slit of the spectrograph where an array of micro optics redirects the beams from the segments to superimpose on the grating of a spectrograph. The focal length of the collimator can then be increased in proportion to the square root of the number of beams, resulting in a proportional increase in the slit width without loss of spectral resolution. An additional advantage is that the longer focus collimator introduces less aberration and can be used off-axis thus avoiding central obstruction near the grating. Following the collimator, an aspherized grating, developed by Gerard Lemaitre and manufactured by Jobin-Yvon, has the advantage of minimizing the number of optical surfaces in a spectrograph.

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Eric Harvey Richardson "Segmented pupil image stacker and spectrograph for a 28-m telescope", Proc. SPIE 2871, Optical Telescopes of Today and Tomorrow, (21 March 1997); https://doi.org/10.1117/12.269026

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