Two imaging spectrometer designs using aberration-corrected holographic recording solutions

Details Two imaging spectrometer designs using aberration-corrected holographic recording solutions Two imaging spectrometer designs using aberration-corrected holographic recording solutions

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spie.3765..582w&link_type=abstract

Proc. SPIE Vol. 3765, p. 582-587, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy X, Oswald H. Siegmund; Kathryn A. Flan

Astronomy and Astrophysics

Astronomy

Scientific paper

Two design concepts for imaging spectrometers are presented. These designs employ first generation, type II holographic gratings to control aberrations and provide excellent spatial resolution with sufficient spectral resolution to isolate individual emission lines over a finite field of view. This effectively creates a narrow band imaging capability. The first designs utilizes a planar substrate with aberration corrected, holographic rulings that is placed in the converging beam of an imaging system. This work demonstrates how the system performance can be substantially increased beyond the performance of an analytic solution using raytrace based computer optimization, which treats all the aberrations simultaneously. The final recording solution and system performance are strongly influenced by the choice of merit functions used in the optimization. The second class of design solutions is based on the classical cassegrain telescope. In these designs aberration corrected, holographic rulings are applied to the parabolic primary or the hyperbolic secondary of the cassegrain telescope. The holographic recording solution for either optic is designed to minimize the aberrations at a specific wavelength. The goal of this work is to explore how the off-axis aberrations of the telescope can be controlled by the holographic rulings at a single wavelength, thus creating an instrument with the high spatial resolution of a cassegrain telescope and the wavelength specific response imposed by the holographic grating.

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