Fresnel rhomb: Difference between revisions
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{{For|the Australian punk rock band|Frenzal Rhomb}} |
{{For|the Australian punk rock band|Frenzal Rhomb}} |
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A '''Fresnel rhomb''' is a [[prism (optics)|prism]]-like device designed in [[1817]] by [[Augustin-Jean Fresnel]] for producing circularly [[polarized]] [[light]], in |
A '''Fresnel rhomb''' is a [[prism (optics)|prism]]-like device designed in [[1817]] by [[Augustin-Jean Fresnel]] for producing circularly [[polarized]] [[light]]. However, in contrast to a [[wave plate]], the rhomb does not utilise birefringent properties of the material. |
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The [[rhomb]] ( |
The [[rhomb]] (usually a right-[[parallelepiped]]) is shaped such that light entering one of the small faces is [[total internal reflection|internally reflected]] twice: once from each of the two sloped faces before exiting through the other small face. The angle of internal reflection is the same in each case, and each reflection produces a 45° (π/4 [[radian]]s) [[phase (waves)|phase]] delay between the two linearly polarized components of the light. Hence on the first reflection, a linearly polarized beam will be elliptically polarized, and will emerge as circularly polarized on the second reflection. |
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For visible light and a [[glass]] rhomb ([[refractive index]] ''n'' ≈ 1.5), an internal reflection angle of incidence of 48° or 54° is required. |
For visible light and a [[glass]] rhomb ([[refractive index]] ''n'' ≈ 1.5), an internal reflection angle of incidence of 48° or 54.6° is required. |
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==See also== |
==See also== |
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*[[Fresnel equations]] |
*[[Fresnel equations]] |
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== External link and |
== External link and references == |
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*Hecht, E. (1987). ''Optics: Second Edition''. Massachusetts: Addison-Wesley Publishing Company, Inc. ISBN 0-201-11611-1 |
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http://physics.kenyon.edu/EarlyApparatus/Polarized_Light/Fresnels_Rhomb/Fresnels_Rhomb.html |
*http://physics.kenyon.edu/EarlyApparatus/Polarized_Light/Fresnels_Rhomb/Fresnels_Rhomb.html |
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Revision as of 00:03, 19 August 2007
A Fresnel rhomb is a prism-like device designed in 1817 by Augustin-Jean Fresnel for producing circularly polarized light. However, in contrast to a wave plate, the rhomb does not utilise birefringent properties of the material.
The rhomb (usually a right-parallelepiped) is shaped such that light entering one of the small faces is internally reflected twice: once from each of the two sloped faces before exiting through the other small face. The angle of internal reflection is the same in each case, and each reflection produces a 45° (π/4 radians) phase delay between the two linearly polarized components of the light. Hence on the first reflection, a linearly polarized beam will be elliptically polarized, and will emerge as circularly polarized on the second reflection.
For visible light and a glass rhomb (refractive index n ≈ 1.5), an internal reflection angle of incidence of 48° or 54.6° is required.
See also
External link and references
- Hecht, E. (1987). Optics: Second Edition. Massachusetts: Addison-Wesley Publishing Company, Inc. ISBN 0-201-11611-1
- http://physics.kenyon.edu/EarlyApparatus/Polarized_Light/Fresnels_Rhomb/Fresnels_Rhomb.html