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Topic: Sagnac interferometer

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Interferometer

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Interference

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	Interferometer Encyclopedia Article @ Faintest.net (Site not responding. Last check: 2007-09-11)
		Interferometers are perhaps even more widely used in integrated optical circuits, in the form of a Mach-Zehnder interferometer, in which light interferes between two branches of a waveguide that are (typically) externally modulated to vary their relative phase.
		A Sagnac Interferometer is an interferometry configuration in which a beam of light is split and the two beams are made to follow a trajectory in opposite directions.
		It is often said that an interferometer achieves the effect of a telescope the size of the distance between the apertures; this is only true in the limited sense of angular resolution.
	www.faintest.net /encyclopedia/Interferometer (2558 words)

	Sagnac effect - Wikipedia, the free encyclopedia
		The Sagnac effect is the electromagnetic counterpart of the dynamics of rotation.
		The type of ring interferometer that was described in the opening section is sometimes called a 'passive ring interferometer'.
		Its purpose was to detect "the effect of the relative motion of the ether".
	en.wikipedia.org /wiki/Sagnac_effect (1852 words)

	Sagnac Vibrometer
		Due to the nature of the Sagnac’s optical configuration, the optical phase shift induced by the surface being probed is differentiated, and therefore results in a measured optical phase shift that is directly proportional to the velocity of surface.
		Therefore the optical phase change measured at the output of the Sagnac interferometer is directly proportional to the velocity of the target surface.
		The Sagnac vibrometer performance range is depicted in Figure 2 as the region between the coherence and slew rate limits and the noise floor.
	www.optiphase.com /sagnac_vibrometer.htm (4397 words)

	Sagnac interferometer based secure communication system - Patent 5311592
		When the two beams are recombined on the central beamsplitter of the Sagnac loop, the two beams interfere with each other and the data impressed as phase modulation on the light beams by the phase modulator is recovered as amplitude modulation on the output detector of the Sagnac interferometer.
		The response of the Sagnac sensor 496 to the environmentally induced oscillation depends on the position of the frequency dependent environmental effect 527 on the Sagnac loop 514 of sensor 496.
		The response of the upper fiber portion 529 of the Sagnac loop 542 of sensor 498 to an environmental effect, fixed in amplitude and frequency, with respect to position is shown in dashed line on the graph of FIG.
	www.freepatentsonline.com /5311592.html (18279 words)

	Single fiber Sagnac interferometer based secure communication system - Patent 6690890
		This invention relates generally to fiber optic communications and more particularly to Sagnac interferometer based fiber optic communication systems that utilize counterpropagating optical beams to impress data on a loop by means of phase modulation.
		Sagnac secure fiber optic communication systems offer the prospect of transmitting this data securely, but heretofore, such has not been adaptable to the installed single fiber, single light band links.
		This invention is designed to include many of the advantages of the conventional loop configuration of Sagnac secure fiber optic communication systems while minimizing dispersion and fiber compatibility problems by using a single fiber configuration between the transmitting and receiving ends of the system.
	www.freepatentsonline.com /6690890.html (3973 words)

	Sagnac
		In this animation the first few frames are run slowly to show how the light strikes the exact centre of the mirrors and then continues at a faster pace to trace the entire path from centre right back to centre right.
		This would of course not be the case in a real Sagnac interferometer which would revolve with a constant angular velocity.
		Georges Sagnac devised his interferometer and gave it to the world in 1913, while Einstein was developing his general theory of crackpottery.
	www.androcles01.pwp.blueyonder.co.uk /Sagnac/Sagnac.htm (358 words)

	Sagnac interferometer
		The Sagnac effect is the relative phase shift between two beams of light that have traveled an identical path in opposite direction in a rotating frame.
		Figure: (a) Schematic setup of a Sagnac interferometer and its modification for magneto-optical measurements in transmission (Faraday effect) or reflection (Kerr effect), respectively.
		For the reciprocal configuration of the Sagnac interferometer constructed as shown in Fig.
	www.physik.fu-berlin.de /~bauer/habil_online/node11.html (602 words)

	The Australian National University <ADT> Public View (Site not responding. Last check: 2007-09-11)
		In particular, we present experimental investigations of interferometer configurations and control techniques to be used in second generation interferometric gravitational wave detectors.
		The frequency response of the interferometer is measured for various detuned points and we observe good agreement with theoretical predictions.
		We show experimentally how a two beam interferometer typically gives excellent isolation against errors arising from changes in the photodetector position, and experimentally demonstrate the use of tilt locking as a signal readout system for a Sagnac interferometer.
	eprints.anu.edu.au /archive/00000629/00 (510 words)

	Patents (Site not responding. Last check: 2007-09-11)
		The Sagnac interferometer can be used to measure wavelength and fiber dispersion properties that are useful as stand-alone instruments and also for supporting fiber gyroscopes.
		This Sagnac-distributed sensor case combines a Sagnac interferometer sensor with an RF generated linear signal to provide information on location and amplitude of a time-varying event.
		This patent describes how the Sagnac interferometer may be used to measure unknown lengths of optical fiber very accurately.
	www.bluerr.com /patents.php (1304 words)

	Institute of Quantum Optics
		In this kind of interferometer the inertial force is encoded in the phase of the atomic wavefunction via the interaction with the atom optical elements, e.g.
		In contrary to atomic clocks, where the interferometer is most sensitive to frequency changes because of the chosen topology, one can employ atom interferometers that are suitable for measuring inertial forces thanks to their sensitivity to phase changes in the light field between the different atom-light interactions.
		As the interferometer length is limited by the reqiurement of a transportable setup and the transverse velocity is mainly determined by the used photon's momentum, the option for CASI is to improve the velocity ratio to get a biggest area as possible.
	www.iqo.uni-hannover.de /ertmer/casiindex (2072 words)

	Sagnac interferometer (Site not responding. Last check: 2007-09-11)
		It is classed as a Sagnac interferometer because of its use of counterpropagating light beams.
		The two probe pulses travel in opposite directions inside the interferometer, but cover the same total optical path, and so the interferometer is relatively insensitive to alignment error and mechanical vibration.
		More details are given in 'Detection of ultrafast phenomena using a modified Sagnac interferometer', D. Hurley and O. Wright, Opt.
	kino-ap.eng.hokudai.ac.jp /interferometer.html (194 words)

	Another Sagnac Rebuttal (Site not responding. Last check: 2007-09-11)
		The source, half-silvered mirror and observing screen (or eyepiece) are all co-located on the Sagnac interferometer.
		So, in a coordinate frame co-rotating with the Sagnac interferometer, there is no relative motion among these components, and no Doppler effect at the entrance or exit points of the light beams.
		In this case, if we defined the velocity of light to be c with respect to the original rotating frame of the interferometer, we would get results consistent with Sagnac’s aether interpretation, except that the aether would now be defined as residing in the original rotating frame of the apparatus.
	renshaw.teleinc.com /papers/ge-asr/ge-asr.stm (478 words)

	Photonics and Optoelectronics Lab
		A Sagnac loop configuration was built using a standard 50/50 fused fiber coupler with the SMF-28 fiber pigtails and a 1-meter long commercial elliptical-core PM-PCF fiber from the Thorlabs (PM-1550-01, loss
		Furthermore, pure silica has a very low thermal expansion coefficient and the change in the birefringence due to the thermal expansion of photonic crystal structure is insignificant.
		Kim and J. Kang, "Sagnac loop interferometer based on polarization maintaining photonic crystal fiber with reduced temperature sensitivity," Opt.
	www.ece.jhu.edu /photonics/research/research01.htm (321 words)

	Noncontact Detection of Ultrasonic Waves Using Fiber Optic Sagnac Interferometer (Site not responding. Last check: 2007-09-11)
		This sensor is based on the fiber optic Sagnac interferometer, which has a path-matched configuration and does not require active stabilization.
		Ultrasonic oscillations produced by conventional ultrasonic piezoelectric transducers were successfully detected, and the performance of this interferometer was investigated by a power spectrum analysis of the output signal.
		The configured Sagnac interferometer is very effective for the detection of small displacement with high frequency, such as ultrasonic waves used in conventional nondestructive testing (NDT).
	www.ieee-uffc.org /archive/uffc/trans/Toc/abs/02/t0260767.htm (217 words)

	Shayne X. Short
		In addition to the promise of performing distributed strain sensing, the in-line Sagnac interferometer has been shown to provide superb performance for current sensing.
		In line with the development of distributed strain sensing is the development of the in-line Sagnac interferometer for current sensing.
		Assuming this demonstration is successful, it will provide further evidence of the ability of our sensor to be constructed with not only fiber-optic components of much less stringent tolerance requirements, but also the ability to perform feedback compensation to ensure proper function in the event of extreme component instability for long-term applications.
	www.tsgc.utexas.edu /grants/96/short.html (600 words)

	IngentaConnect The optical fibre Sagnac interferometer: an overview of its princ...
		IngentaConnect The optical fibre Sagnac interferometer: an overview of its princ...
		The optical fibre Sagnac interferometer was first demonstrated over 25 years ago.
		The basic interferometer is now well understood and the engineering required to realize useful and effective instruments has been carefully defined.
	www.ingentaconnect.com /content/iop/mst/2006/00000017/00000001/art00r01 (266 words)

	Australian National University EPrints2 Archive - Advanced Interferometry for Gravitational Wave Detection (Site not responding. Last check: 2007-09-11)
		We report the first experimental demonstration of a Sagnac interferometer with resonant sideband extraction (RSE).
		A system for the control and signal extraction of a power recycled Michelson interferometer with RSE is presented.
		Tilt locking, a new technique to obtain an error signal to lock a laser to an optical cavity, is presented.
	eprints.anu.edu.au /archive/00/00/06/29 (588 words)

	U.S. Pregrant 20020097943 - Fast, environmentally-stable fiber switches using a sagnac interferometer (Site not responding. Last check: 2007-09-11)
		A pump pulse is applied to the interferometric loop and acts upon the active fiber portion to cause a change in its refractive index either by a thermal effect or by a non-thermal nonlinear effect.
		The temporary difference in the phase changes causes the two light signals to combine constructively at a switched output port of the input/output coupler of the interferometric loop until the phase changes of the two signals are again the same, at which time the signals combine at an unswitched output port of the coupler.
		The on-time of the switch is set primarily by the length of the Sagnac loop, and the fall time, which is caused by the Sagnac architecture, can be fast, even with a relatively slow active fiber.
	cxp.paterra.com /uspregrant20020097943.html (368 words)

	A modified Sagnac interferometer for magnetization measurements
		A Sagnac interferometer is sensitive to non-reciprocal effects, i.e.
		A magnetized sample inserted into the fiber loop of the interferometer (either in transmission or reflection geometry, see Fig.
		It is easy to confirm that each of the reflected beams indeed continues along its original path in the fiber loop.
	www.physik.fu-berlin.de /~bauer/habil_online/node12.html (513 words)

	Sagnac Interferometer -- from Eric Weisstein's World of Physics
		Sagnac Interferometer -- from Eric Weisstein's World of Physics
		A ring interferometer than can be built in triangular and square configurations.
		Sagnac interferometers are used as an alternative to gyroscopes to measure changes with respect to an inertial reference frame in fighter planes.
	scienceworld.wolfram.com /physics/SagnacInterferometer.html (43 words)

	Photonics and Optoelectronics Lab
		We have experimentally investigated temperature dependence of the birefringence of polarization maintaining photonic crystal fiber using Sagnac interferometer configuration.
		Compared to a standard Sagnac filter frequency discriminator, the proposed device improves the dynamic range of the filter by 3 dB.
		We investigate all-optical nonlinear switching and optical limiting properties of double-loop fiber Sagnac interferometers with symmetric power splitting.
	www.ece.jhu.edu /photonics/research.htm (509 words)

	U.S. Pregrant 20020044716 - Multiple wavelength sagnac interferometer switch (Site not responding. Last check: 2007-09-11)
		Optical switching apparatus includes a circulator coupling an input port, an output port and a Sagnac interferometer.
		The Sagnac interferometer includes a plurality of phase modulators coupled into the Sagnac loop.
		Each phase modulator operates on one wavelength component of wavelength division multiplexed signals to determine whether the corresponding wavelength component is coupled from the input port to the output port.
	cxp.paterra.com /uspregrant20020044716.html (114 words)

	CiteULike: anonymouspage's sagnac (Site not responding. Last check: 2007-09-11)
		Recent papers added to anonymouspage's library classified by the tag sagnac.
		High-resolution, large dynamic range fiber length measurement based on a frequency-shifted asymmetric Sagnac interferometer
		acousto-optics coherence dental depolarization dermatology dgd doppler ellipsometry endoscope fiber fluorescent fourier_transform_method full-field-oct gdx_vcc glaucoma image_processing lightsource mueller neutron_optics no-tag oct ofdr ophthalmology pdl phase_shift physical_optics pm-fiber pmd polarimeter polarization ps-oct quantum_optics retina sagnac scattering segmentation speckle spectroscopy swept-source tomography turbid_media
	www.citeulike.org /user/anonymouspage/tag/sagnac (83 words)

	Instrumentation, measurement, and metrology : Sagnac effect
		Polarization Sagnac interferometer with a common-path local oscillator for heterodyne detection
		Polarization Sagnac interferometer with postmodulation for gravitational-wave detection
		Compensation of polarization-dependent loss in transmission fiber gratings by use of a Sagnac loop interferometer
	www.opticsinfobase.org /ocisdirectory/120_5790.cfm (303 words)

	Writing Of Bragg Gratings With Wavelength Flexibility Using A Sagnac Type Interferometer And Application To Fh-Cdma - ... (Site not responding. Last check: 2007-09-11)
		Writing Of Bragg Gratings With Wavelength Flexibility Using A Sagnac Type Interferometer And Application To Fh-Cdma - Corts, Fathallah, LaRochelle, Rusch, Loiselle (ResearchIndex)
		Writing Of Bragg Gratings With Wavelength Flexibility Using A Sagnac Type Interferometer And Application To Fh-Cdma (1998)
		P.-Y. Corts, H. Fathallah, S. LaRochelle, L. Rusch, and P. Loiselle, "Writing of Bragg gratings with wavelength flexibility using a Sagnac type interferometer and application to FH-CDMA," in Proc.
	citeseer.ist.psu.edu /corts98writing.html (293 words)

	Sagnac/SNOM Results (Site not responding. Last check: 2007-09-11)
		The figure on the left shows the first results of our new instrument.
		It is an image of a magneto-optical disk taken with the newly-developed magnetic-sensitive Sagnac Interferometer/Scanning Near-Field Optical Microscope.
		To our knowledge, no other researchers have been able to create such images of MO-disks with SNOM in reflection.
	www.geocities.com /tagusaku/physics/snomindex.html (163 words)

	Sagnac Interferometer Text - Physics Forums Library (Site not responding. Last check: 2007-09-11)
		Physics Help and Math Help - Physics Forums > Physics > Classical Physics > Sagnac Interferometer
		Could you all tell me more about Sagnac Interferometer?
		I saw some paper mention Second order sagnac filter with a 22.5deg axis rotation between 2 high birefringence fibre?
	www.physicsforums.com /archive/index.php/t-53181.html (44 words)

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