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can.conirm.that.the.Strehl.ratio.is.the.ratio.of.the.on-axis.intensity.of.the.aberrated.PSF.to.that.of.the.
difraction-limited.PSF,.which.is.its.original.deinition.
1.7 conclusion
In.this.chapter,.we.have.given.a.brief.introduction.to.the.extensive.ield.of.wave.optics.and.its.practical.
application.in.optics.system.design..We.have.covered.the.basic.physical.principles.of.light.waves.viewed.
as.an.electromagnetic.phenomenon.(starting.from.Maxwell's.laws).and.as.a.traveling.wave.phenomenon.
(starting.from.the.Huygens.theory).and.briely.touched.on.the.nature.of.the.light.quanta,.the.photon..
he.polarization.properties,.propagation.and.scattering.in.a.material.medium,.dispersion,.refraction,.
and.difraction.naturally.follow.from.these.basics..he.limit.of.when.light.wave.interference.begins.to.
dominate.geometric.ray.behavior.is.understood.by.calculating.two.key.scales,.the.Fresnel.zone.size.and.
the.Rayleigh.range.distance.
he. References. section. can. be. consulted. for. rigorous. development. of. the. theories.. In. particular,.
consult. Siegman. (1986). for. the. Huygens-Fresnel. beam. propagation. theory. and. numerical. methods,.
Goodman. (2005). for. imaging. systems. and. optical. transfer. functions,. and. Born. and. Wolf. (2002). for.
geometric. optics. and. wave. optics. theory,. aberrations. analysis,. and. scattering.. We. also. highly. recom-
mend.the.entertaining.work.by.Feynman.(2006).for.an.illuminating.discussion.of.the.Fermat.principle.
of.least.optical.path.
references
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Difraction of Light
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http://en.wikipedia.
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A.. Einstein,. Über. einen. die. Erzeugung. und. Verwandlung. des. Lichtes. betrefenden. heuristischen.
Gesichtspunkt,.
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QED: he Strange heory of Light and Matter
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J..W..Goodman,.
Introduction to Fourier Optics
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C..Huygens,.
Traité de la Lumiere
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