University of Rochester
Baumgardner, John Dwane (1940 - ).
Theory and design of unusual concave gratings.
Degree: PhD, 2017, University of Rochester
Technological advances in rocket techniques have
made possible the study of far ultraviolet spectra of stellar
sources with high resolution spectrographs. It is found that
spectrographs of this type require special techniques for
aberration control. These techniques include deforming the grating
surface, using an off-plane mount, and altering the rulings.
</br>Using an optical path difference approach as a
basis for an aberration theory of the concave reflection grating,
the first few chapters of this thesis presents the derivation of
those expressions required for predicting the necessary grating
modifications to control astigmatism, coma, and off-plane image
rotation. The theoretical development sets no requirements on the
location of the object, the shape of the grating surface, or even
on the shape and spacing of the rulings. Expressions that
accurately predict the ray deviations, at any wavelength, of an
arbitrary ray are found. Special ray trace equations are developed
for use in verifying the theoretical predictions.
</br>A computer design program, based on the
theoretical results, is presented. This program has been used to
obtain significant improvements in the performance of three
Wadsworth type, far-ultraviolet high resolution rocket borne
spectrographs. While the methods proposed for aberration control in
this case are unconventional the results they produce merit serious
consideration in any attempt to optimize the performance of a
spectrograph. The present art of grating manufacture allows the
production of gratings with unusual surface figures. Consequently,
some of the theoretical results are immediately applicable. With
regard to gratings with unusual ruling patterns, the theory
presented here advances the state of the art of grating design
beyond present capabilities of grating manufacture. In view of this
it is hoped that added impetus for the development of methods for
producing such gratings has been provided since it is shown that
unusual ruling patterns can be used effectively to control
to Zotero / EndNote / Reference
APA (6th Edition):
Baumgardner, J. D. (. -. ). (2017). Theory and design of unusual concave gratings. (Doctoral Dissertation). University of Rochester. Retrieved from http://hdl.handle.net/1802/32049
Chicago Manual of Style (16th Edition):
Baumgardner, John Dwane (1940 - ). “Theory and design of unusual concave gratings.” 2017. Doctoral Dissertation, University of Rochester. Accessed February 23, 2017.
MLA Handbook (7th Edition):
Baumgardner, John Dwane (1940 - ). “Theory and design of unusual concave gratings.” 2017. Web. 23 Feb 2017.
Baumgardner JD(-). Theory and design of unusual concave gratings. [Internet] [Doctoral dissertation]. University of Rochester; 2017. [cited 2017 Feb 23].
Available from: http://hdl.handle.net/1802/32049.
Council of Science Editors:
Baumgardner JD(-). Theory and design of unusual concave gratings. [Doctoral Dissertation]. University of Rochester; 2017. Available from: http://hdl.handle.net/1802/32049