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Topic: Faraday rotation

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Faraday effect

Faraday isolator

Verdet constant

Magnetism

Polarization

Birefringence

Michael Faraday

Electromagnetism

Ferrimagnetism

Resonance

Electricity

Ferrite

Sucrose

Electrical resistance

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	Single-polarization fiber optics magnetic sensor - Patent 4584470
		This linearly polarized light enters a Faraday rotation element 6 and is derived out as signal light through an analyzer 7 optically coupled to the exit of the element 6.
		In this arrangement, the positioning of the polarizer 5 and the analyzer 7 at the opposite ends of the Faraday rotation element 6 is indispensable.
		The exit light from the upstream polarization-maintaining optical fiber 103 enters a Faraday rotation element 106 in the form of a YIG device in the illustrated embodiment.
	www.freepatentsonline.com /4584470.html (1687 words)

	Faraday effect - Wikipedia, the free encyclopedia
		In physics, the Faraday effect or Faraday rotation is a magneto-optical phenomenon, or an interaction between light and a magnetic field.
		The rotation of the plane of polarization is proportional to the intensity of the component of the magnetic field in the direction of the beam of light.
		Faraday rotation is an important tool in astronomy for the measurement of magnetic fields, which can be estimated from rotation measures given a knowledge of the electron number density.
	en.wikipedia.org /wiki/Faraday_effect (880 words)

	Generalized Faraday rotation (Site not responding. Last check: 2007-10-30)
		The propagation effect is then Faraday rotation, which causes the plane of any linear polarization to rotate and which does not alter the degree of circular polarization.
		Generalized Faraday rotation causes the point P to rotate at constant latitude relative to the axis defined by the natural modes of the medium.
		Faraday rotation, as usually defined, corresponds to circularly polarized natural modes, and then the axis about which this rotation occurs is the vertical axis.
	www.atnf.csiro.au /pasa/15_2/kennett/paper/node2.html (822 words)

	Faraday Crystals TGG and Glasses MOS-4 and MOS-10
		The amount of rotation observed for any given substance is found by experiment to be proportional to the field strength and to the distance the light travels through the medium.
		Faraday Isolators are passive unidirectional, non reciprocal devices that utilize the phenomenon of Magneto-Optic Rotation to isolate the source from reflections in an optical system.
		Faraday Rotators are also used for example in ring laser systems to introduce a loss mechanism (in conjunction with some other intra-cavity polarization selective element) which is greater for one direction of propagation than for the other.
	www.mt-berlin.com /frames_cryst/descriptions/faraday.htm (634 words)

	[No title]
		Faraday is a fascinating subject for such an investigation both because he is one of the outstanding scientists of the nineteenth century and because he, like many other great scientists down the ages, had a very significant and distinctive religious perspective.
		Faraday's confession of faith, at age 29, was then, so far as we know, not a conversion, but a formal and, in view of the strictness of Sandemanian discipline, a carefully weighed acceptance of the responsibilities of membership in a demanding spiritual fellowship, which he well understood.
		Faraday was also concerned to disseminate the results of science in practical ways that brought material benefits to his fellow man. He saw the powers of nature as intended `always for our good' and therefore the understanding of nature as an opportunity for material improvement.
	silas.psfc.mit.edu /Faraday (4523 words)

	EOT - Electro-Optics Technology, Inc.
		In the reverse (isolation) direction, the non-reciprocal Faraday rotation and the 45 degree polarizer transmission axis angle add so that the polarization transmitted by the output polarizer is rejected at the input polarizer.
		The input and output polarizers work in conjunction with the central Faraday Rotator to form a Faraday Isolator as described previously in Section I. Though the overall size of the device varies depending on the wavelength dependent model, the size and operation of the polarizer mounts are identical.
		To re-align the waveplate loosen the radially oriented set-screw in the output polarizer mount and rotate the waveplate until the desired output polarization is achieved.
	www.eotech.com /techsupport/faraday/userguide/lowerpower/lowerpower.php (2764 words)

	Fiber Optic Wheel Sensor
		Sensor: The essence of the Faraday effect is that the polarization direction of light in a crystal rotates in the presence of a magnetic field along the propagation direction.
		The proportionality constant for Faraday rotation, the Verdet constant, is a property of the crystal material, but it is particularly large for a class of materials known as iron-garnets.
		Since the Faraday rotation depends on the component of the optical path along the magnetic field direction, all the light is rotated by the same angle, whether or not it has been diffracted, so long as the field is uniform over the crystal dimensions.
	www.lanl.gov /p-22/wheel.html (877 words)

	Polarization and One-way EME Propagation
		When the rotated signal has been reflected back from the moon and re-enters the ionosphere, it will be rotated some more in the same direction - Faraday rotation does not cancel out.
		Faraday rotation is proportional to 1/(frequency)², so that when the ionosphere does change, the polarization angle changes 9 times more rapidly at 144MHz than it does at 432MHz.
		At 144MHz in unstable conditions, Faraday rotation can change rapidly enough that you can lose a station before the QSO is complete; but when the ionosphere is stable, the polarization at 432MHz can remain 'stuck' at a bad angle for the whole day.
	www.ifwtech.co.uk /g3sek/eme/pol4.htm (856 words)

	Faraday Rotation for the RAFT1 Satellite (Site not responding. Last check: 2007-10-30)
		Faraday Rotation along the 217 Mhz path from the Naval Space Surveillance transmitter at Lake Kickapoo, Texas to the RAFT1 satellite was investigated.
		Applicability of using the quasi-longitudinal equation for Faraday Rotation
		The procedure to predict Faraday Rotation involves retrieving predicted or typical ionospheric electron density profiles, computing the 3D geometry involved, determining the Earth's magnetic field along the signal path, and finally, applying the numbers to the Faraday Rotation equation.
	www.k4gfg.us /faraday/frintro.htm (126 words)

	E-Cass:2000-JS - UofT Theses
		A comparison of the Faraday rotation measures of sources viewed through the intracluster medium, to the rotation measures of sources falling beyond the edge of the X-ray emitting gas, reveals the presence of excess Faraday rotation in the former sample.
		This excess rotation is interpreted as originating in the diffuse intracluster medium.
		A detailed investigation of the Faraday rotating medium indicates that the Faraday screen is well represented by a model of Faraday cells distributed through the intracluster medium.
	www.astro.ubc.ca /E-Cass/2000-JS/theses.html (1324 words)

	[16.13] Faraday Rotation Probing of the Solar Corona in 1997 (Site not responding. Last check: 2007-10-30)
		Faraday rotation observations of polarized radiation from natural radio sources yield a unique diagnostic of the coronal magnetic field and electron density at heliocentric distances not reached by spacecraft.
		We attribute the relatively low values for the rotation measures to the magnetohydrodynamic state of the corona at the time of the observations.
		The largest rotation measure was observed for the source 3C79 on May 11, 1997, and corresponds to a case in which the line of sight passed through the streamer belt at small solar elongation.
	www.aas.org /publications/baas/v31n3/aas194/108.htm (298 words)

	Lowell/NAU/USNO Colloquia Speakers 2004 - Bob Zavala
		Additionally, the rotation measure serves as a probe of the physical conditions in the gas which acts as the Faraday screen.
		Rotation measure maps on parsec scales yield information on the magnetic field topology and strength within a few hundred parsecs of the supermassive fl hole responsible for the observed AGN activity.
		Beyond a projected distance of approximately 10 parsecs the rotation measures of the optically thin jets of BL Lacs and quasars are indistinguishable with rotation measures of a few hundred rad m or less.
	www.lowell.edu /Research/Colloquium/speakers0304/zavala.html (384 words)

	Electro-optical (Kerr, Pockels, and Faraday effect)
		The polarization of the light is rotated in proportion to the square of the E field, allowing some light to pass through the polarizers.
		The rotation is proportional to the length of the optical path and to the magnetic field, so a longer piece of glass makes a more sensitive detector.
		Faraday rotation does provide a handy way to measure the current in EHV or UHV power lines.
	home.earthlink.net /~jimlux/hv/eo.htm (728 words)

	Optically active materials + Faraday Rotation
		I have been told that for a linearly polarised wave, the direction of rotation due to the Faraday effect (caused by a constant magnetic field) is independent of the direction of wave propagation, dependent only upon the direction of the magnetic field.
		If you place a mirror after the rotator that sends it back the way it came, the light will be p-polarized after it goes through the rotator a second time.
		That is why a Faraday rotator (coupled with a polarizer) works as an optical isolator (light can only go one direction).
	www.physicsforums.com /showthread.php?t=62808 (420 words)

	Faraday rotation
		A magneto-optic effect, also known as the Faraday effect, in which the plane of polarization of an electromagnetic wave is rotated under the influence of a magnetic field parallel to the direction of propagation; it is named after the English physicist Michael Faraday (1791-1867), who first observed the effect in 1845.
		Faraday rotation is displayed by radio waves as they travel through the interstellar medium.
		Observing it in the radiation from pulsars is among the most important ways of studying the galactic magnetic field.
	www.daviddarling.info /encyclopedia/F/Faraday_rotation.html (183 words)

	Faraday Rotation Effects associated with the Radio Source Centaurus A
		SCIAMA has proposed an interesting explanation of the Faraday rotation which is observed to be associated with the radiation from Centaurus A.
		The agreement between the observed rotation and that which would be produced by magnetic fields, electron densities and path lengths appropriate to his model of the local cluster of galaxies
		Their results, which are soon to be published, indicate that there is a substantial galactic contribution to the rotation; in general, sources at high galactic latitudes show less rotation than those close to the plane.
	www.nature.com /nature/journal/v196/n4856/abs/196761a0.html (154 words)

	Astrophysical Background
		This magnetic field is inferred using the technique of measuring the Faraday rotation by a foreground screen of the vector of polarized emission of an underlying, highly polarized source.
		The Faraday rotation measures indicate that strong magnetic fields of immense energy are associated with AGN.
		The twist is opposite to the rotation of the disk, because the moment of inertia of the expanding plume always increases and therefore the plume slows down relative to the frame.
	kestrel.nmt.edu /~dynamo/Background (2245 words)

	Faraday Rotation Effect (Site not responding. Last check: 2007-10-30)
		The rotation of the plane of polarization of light propagating along a magnetic field in a dispersive medium is studied as a function of magnetic field and compared to a simple theory.
		Serber, R., "The theory of the Faraday effect in molecules", Phys.
		Van Baak, D. "Resonant Faraday rotation as a probe of atomic dispersion", Am.
	courses.washington.edu /phys331/faraday_effect.html (70 words)

	EETimes.com - Integrated optics need magnets
		Hybrid Faraday rotation optical isolators require hybrid integration and alignment, integration of film magnets, hybrid polarizing elements and magneto-optical materials.
		The implementation of that device required alignment between the waveguide Faraday rotator and silica waveguide and an external magnet.
		Faraday rotation can be enhanced in photonic bandgap structures consisting of magnetic thin film stacks.[5] To avoid TE/TM mismatch, the waveguide rotator can be replaced with unguided propagation.
	www.eetimes.com /story/OEG20010925S0069 (1187 words)

	Faraday Rotation Observations of the Solar Corona (Site not responding. Last check: 2007-10-30)
		[15.04] Faraday Rotation Observations of the Solar Corona
		Faraday rotation measures the path integral of the product of electron density and line of sight component of the magnetic field from the observer to a source of linearly polarized radio emission.
		We observed the extended radio source 0036+030 (4C+03.01) on March 28, 1997, when the source was 8.6 R_ødot from the center of the Sun.
	www.aas.org /publications/baas/v30n2/aas192/abs/S015004.html (228 words)

	Magnetic Fields
		This linearly polarized signal can be utilized as an extremely effective probe of the intervening magneto-ionic medium between the source and observer since the intrinsic plane of polarization undergoes Faraday rotation as this emission propagates.
		As synchrotron emission propagates through the intervening magneto-ionic medium its inherent linear polarization suffers Faraday rotation effects depending on both the field strength and the electron density, and measurements of Faraday rotation effects can give information on parameters which is unobtainable by other means.
		Such features are interpreted as the effects of a ``Faraday screen'', a region of ionized gas threaded by magnetic field lying between the source of the emission and the observer.
	www.ras.ucalgary.ca /SKA/science/node11.html (2368 words)

	EA6VQ - The ionosphere at VHF
		I have electronic rotation by turning a potentiometer, and I frequently check the polarisation by locating the null which is practically always as deep as the accuracy of the system can detect.
		Faraday rotation in the longitudinal case is 2/Y times stronger than conversion from linear to circular in the transverse case.
		The transverse Faraday rotation decreases as 1/f^3, instead of the 1/f^2 of longitudinal Faraday rotation.
	www.vhfdx.net /discuss/ionoVHF.html (11246 words)

	RMK articles : Optical Vortices, Faraday Rotation, Optical Activity.
		Simple examples demonstrate that the differences between Faraday rotation where the 3-form of Topological Torsion, A^F, is not zero, and Optical Activity where the 3-form of Topological Spin, A^G, is not zero.
		The 1-form, k, whose line integral generates the phase function, Theta, is not necessarily equal to the system 1-form of Action per unit charge, A, whose components form the vector and scalar potentials.
		The first type of defect is related to Faraday rotation, circular polarization, and topological torsion, with A^F not equal to zero.
	www22.pair.com /csdc/pd2/pd2fre55.htm (259 words)

	JLN Labs - Faraday Homopolar Disc Generator
		"In the fall of 1831 when Michael Faraday performed the initial experiments which resulted in the discovery of the first dynamo, he also described a phenomenon which has yet to be understood in terms of conventional electrical theory.
		In reality the only important motion is relative movement between Faraday's disk and his external circuit, and the rotation of the magnet is unimportant.
		Of course the magnetic field is necessary to accomplish the effect, but it's relative rotation only creates net radial charge separation without creating current.
	jnaudin.free.fr /html/farhom.htm (493 words)

	Faraday Rotation by Cyclotron Resonance in a GaAs Heterojunction (Site not responding. Last check: 2007-10-30)
		Using a novel polarization technique, we have measured the Faraday rotation of the two dimensional electron gas of a GaAs heterojunction at 100 GHz in magnetic fields up to 8 T. The Faraday rotation is measured using a linear polarizer rotating at 22 Hz using phase sensitive lock-in techniques.
		The sample has a carrier density of n = 2-5 \times 10^11 cm^-2, and its 4K mobility is \mu = 800,000 cm^2/Vs. The observed cyclotron resonance occurs at 0.25 T consistent with GaAs effective mass and displays a width \gamma = 0.8 cm^-1.
		The Faraday rotation has an antiresonance line shape with a maximum Faraday rotation of 7^\circ.
	flux.aps.org /meetings/YR98/BAPSMAR98/abs/S3900008.html (208 words)

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