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Books > Science & Mathematics > Physics > Optics (light)
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Electromagnetic Theory of Gratings (Paperback, Softcover reprint of the original 1st ed. 1980)
Loot Price: R2,888
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Electromagnetic Theory of Gratings (Paperback, Softcover reprint of the original 1st ed. 1980)
Series: Topics in Current Physics, 22
Expected to ship within 10 - 15 working days
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When I was a student, in the early fifties, the properties of
gratings were generally explained according to the scalar theory of
optics. The grating formula (which pre dicts the diffraction angles
for a given angle of incidence) was established, exper imentally
verified, and intensively used as a source for textbook problems.
Indeed those grating properties, we can call optical properties,
were taught'in a satisfac tory manner and the students were able to
clearly understand the diffraction and dispersion of light by
gratings. On the other hand, little was said about the "energy
properties," i. e., about the prediction of efficiencies. Of
course, the existence of the blaze effect was pointed out, but very
frequently nothing else was taught about the efficiency curves. At
most a good student had to know that, for an eche lette grating,
the efficiency in a given order can approach unity insofar as the
diffracted wave vector can be deduced from the incident one by a
specular reflexion on the large facet. Actually this rule of thumb
was generally sufficient to make good use of the optical gratings
available about thirty years ago. Thanks to the spectacular
improvements in grating manufacture after the end of the second
world war, it became possible to obtain very good gratings with
more and more lines per mm. Nowadays, in gratings used in the
visible region, a spacing small er than half a micron is common."
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