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Topic: Brillouin Scattering

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	Forward Brillouin Scattering (Site not responding. Last check: 2007-10-28)
		Rocky Mountain Scattering Cremation options - aerial ash scattering, mountain ash scattering, and river ash scattering in Southwest Colorado throughout the San Juan forestry.
		Memories on the Wind Ash scattering cremation remains and ash scattering pet cremains.
		Quantum Scattering Theory and Applications A brief introduction to quantum scattering as well as a full-text Ph.D. thesis from Adam Lupu-Sax.
	www.serebella.com /encyclopedia/article-Forward_Brillouin_Scattering.html (368 words)

	SMARTEC Services (Site not responding. Last check: 2007-10-28)
		Brillouin scattering is an interaction between light and the media, which is strain and temperature-dependent.
		Stimulated Brillouin scattering is thus noting else than an optical gain experienced by the Stokes wave traveling through the electrostrictive material in presence of the pump wave.
		Brillouin is an intrinsic property of optical material, this is very attractive since the bare fiber itself acts as sensing element with no special fiber processing or preparation.
	www.smartec.ch /Pages/DiTeStFAQ.htm (1079 words)

	Brillouin Spectroscopy
		Brillouin light scattering is generally referred to as inelastic scattering of an incident optical wave field by thermally excited elastic waves in a sample.
		The scattering in this case is mediated by the elasto-optic scattering mechanism, in which dynamic fluctuations in the strain field bring about fluctuations in the dielectric constant, and these in turn translate into fluctuations in the refractive index.
		Surface Brillouin Scattering (SBS) is a non-contact measurement technique that exploits light scattering to probe the properties of surface acoustic waves (SAWs), either at the surface of homogeneous solids or in thin supported layers.
	www.soest.hawaii.edu /~zinin/Zi-Brillouin.html (925 words)

	Brillouin scattering (Site not responding. Last check: 2007-10-28)
		Brillouin scattering occurs when light in a medium (such as water or a crystal) interacts with density variations and changes its path.
		From a quantum point of view, Brillouin scattering is consideredto consist of interaction of light photons with acoustic or vibrational quanta(phonons).
		The scattered light has a wavelength that is changed slightly by a variablequantity known as the Brillouin shift.
	www.therfcc.org /brillouin-scattering-177704.html (126 words)

	Brillouin Scattering
		Scattering of light from acoustic modes is called Brillouin scattering.
		The analogy is made to Bragg scattering in that the sound waves produce effective planes for scattering the incident waves.
		The periodic scattering of the light reduces the "quality" of the cavity and prevents laser action.
	hyperphysics.phy-astr.gsu.edu /hbase/optmod/brill.html (507 words)

	Rayleigh Scattering
		As described on the figure below, this scattering occurs for a given direction, as in the case of a Bragg grating, and induces a Doppler frequency shift of the scattered light, because the pressure variations of an acoustic wave are periodic and travelling in the material.
		This scattering, called spontaneous Brillouin scattering, can also be described using the quantum physics: a photon from a pump lightwave is transformed in a new Stokes photon of lower frequency and a new phonon adding to the acoustic wave.
		The easiest way to study stimulated Brillouin scattering in an optical fiber is to launch two lightwaves with slightly different frequencies in the opposite directions, and then to measure the amplification of the Stokes (i.e.
	metwww.epfl.ch /Brillouin/physique_brillouinE.htm (648 words)

	Backward brillouin scattering optical time domain reflectometry US Patent 5767956 (Site not responding. Last check: 2007-10-28)
		An improved backward Brillouin scattering optical time domain reflectometry (OTDR) device is provided which is capable of detecting the deterioration of or anticipating the fracture in an optical cable or optical fiber and measuring the position of the failure part with high resolution.
		A backward Brillouin scattering OTDR device as defined in claim 1, wherein said reflection light detector (30) detects said reflected pulse from said optical cable (24) through a heterodyne detection method for converting said reflected pulse to an electric signal by an optical detector (31).
		The stimulated Brillouin scattering is observed as a phenomenon which shows a parametric interaction between the acoustic wave and the scattering light when the intensity of the light is increased.
	patents.nimblewisdom.com /patent/5767956-Backward-brillouin-scattering-optical-time-domain-reflectometry (4402 words)

	Fiber Sensor Uses Raman and Brillouin Scattering - July, 2005 (Site not responding. Last check: 2007-10-28)
		Brillouin scattering can be understood as a purely classical effect in which the laser light is reflected from a spontaneous sound wave propagating in the fiber.
		Raman scattering is a quantum-mechanical effect in which a photon is scattered from a molecular vibration.
		The intensity of Raman scattering depends on the thermal population of the excited molecular energy level, and the intensity of Raman-scattered light hence is a function of temperature.
	www.photonics.com /spectra/research/XQ/ASP/preaid.244/placement.HomeIndex/QX/read.htm (923 words)

	SRI: PSD's Home Institutions and Research Projects of Recent REU Program Participants
		Brillouin scattering, the scattering of light from density fluctuations caused by acoustic waves, provides information on elastic or compressional properties.
		In this experiment, stimulated Rayleigh and Brillouin scattering were induced by overlapping the beam of a high power, injection-seeded Nd:YAG laser (pump laser) with that of a weaker tunable diode laser (probe laser) at approximately 1064 nm.
		The widths and shifts of the Rayleigh and Brillouin peaks in a measured spectrum were the parameters used to determine the thermal and compressional properties of near critical and supercritical hexane.
	www.sri.com /psd/reu/2000.html (1346 words)

	Brillouin Scattering at the University of Illinois Urbana-Champaign (UIUC) (Site not responding. Last check: 2007-10-28)
		Brillouin Scattering at the University of Illinois Urbana-Champaign (UIUC)
		The Brillouin lab at UIUC is fully operational for studies of the sound velocities and elastic properties of solids and liquids at STP, high pressures, and high temperatures.
		Brillouin results on crystals are complementary to the results of P-V equation of state measurements, and can provide a basis for interlaboratory calibration with other acoustical and compression techniques.
	www.chipr.sunysb.edu /FebruaryWorkshop/Facilities/Bass.html (549 words)

	materials science 01
		Thermal neutron scattering is a typical microscopic probe for investigating dynamics and structure in condensed matter.
		In contrast, light scattering and in particular Brillouin scattering is a typical macroscopic probe suitable for the investigation of hydrodynamics.
		of the density fluctuations in the fluid that interact with the scattered radiation (usually light) is large compared with the mean free path l (we regard the fluid for a moment as a collection of moving and colliding hard spheres).
	www.ill.fr /AR-96/pages/05liquid.htm (927 words)

	CN's Group (Site not responding. Last check: 2007-10-28)
		High pressure Brillouin scattering studies of Be doped ZnTe epitaxial films: The project is to study the elastic constant measurements of these films as a function of Be concentration and pressure.
		We are using the Brillouin scattering technique to elucidate the elastic constants on well characterized films, from Oliver Pages (French group).
		Surface enhanced Brillouin Scattering studies of nanowires and tubes: There is a long standing interest in the mechanical properties of the nano systems vis-a-vis their bulk materials.
	www.jncasr.ac.in /cbhas/photo.htm (477 words)

	Omnisens - Technology
		The phenomenon used to measure temperature or strain in a fiber optic relies on the interaction between a laser light and the glass material in an optical fiber.
		The Brillouin shift depends on the density of the fiber glass which is dependent on strain and temperature.
		To optimize the scattered signal, Omnisens has developped a proprietary optical setup, developped in collaboration with the EPFL to improve the measurement distance range while keeping an unmatched performance in terms of acquisition time and accuracy.
	www.omnisens.ch /technology/tech_dist_bs.htm (219 words)

	Elasicity Grand Challenge Workshop - Program and Abstracts
		A main advantage of measuring elastic properties by Brillouin scattering is that small samples can be used (with a thickness of less than 10 μm and lateral dimensions of 50x50 μm or smaller).
		Brillouin measurements are readily performed in a diamond anvil cell at high pressures corresponding to that of the lower mantle.
		Brillouin scattering is an optical spectroscopic method that measures the sound velocities of material.
	ijolite.geology.uiuc.edu /EGC2004/EGC_2004_Abstracts.htm (3287 words)

	Fiber Laser Q-Switched by Stimulated Brillouin Scattering - June, 2003 (Site not responding. Last check: 2007-10-28)
		In the technique, stimulated Brillouin scattering, which is considered detrimental in most optical fiber, generates a narrow seed pulse that travels backward through the population inversion and quickly gains amplitude.
		Another way of understanding the effect is to view the scattering as a feedback mechanism that dramatically increases the resonator's Q during the nanosecond lifetime of the acoustic wave.
		The stimulated Brillouin scattering thus serves as a passive Q-switch inside the fiber laser resonator.
	www.photonics.com /spectra/research/XQ/ASP/preaid.123/QX/read.htm (538 words)

	ILL : ANNUAL REPORT 2000
		With inelastic neutron scattering (INS), on the other hand, the dispersion of spin waves in much larger portions of the BZ is in principle accessible.
		In bulk the Brillouin zone is determined by the periodicity of the lattice, i.e.
		This superlattice period L, which is the sum of the individual Dy and Y layer thicknesses, is expected to induce a folding of the Brillouin zone like in the case of phonons in superlattices [10] or graphite intercalated compounds [11].
	www.ill.fr /AR-00/p-26.htm (1310 words)

	Sound Velocity and Elasticity of Tetragonal Lysozyme Crystals by Brillouin Spectroscopy -- Speziale et al. 85 (5): 3202 ...
		Brillouin, Rayleigh and depolarized scattering studies of polypropylene glycol.
		Brillouin scattering, density and elastic properties of the lens and cornea of the eye.
		Elasticity of hydrogen to 24 GPa from single-crystal Brillouin scattering and synchrotron x-ray diffraction.
	www.biophysj.org /cgi/content/full/85/5/3202 (4707 words)

	Photonics - Stimulated Brillouin Scattering
		Raman and Brillouin scattering are inelastic processes in which part of the power is lost from an optical wave and absorbed by the transmission medium.
		Raman and Brillouin scattering processes can become nonlinear in optical fibres due to the high optical intensity in the core and the long interaction lengths afforded by these waveguides.
		The scattered wave is frequency-shifted from the pump and in the case of SBS propagates in the opposite direction.
	www.npl.co.uk /photonics/nonlinear/sbsandsrs.html (496 words)

	Novel suppression scheme for Brillouin scattering
		We demonstrate a new scheme for the efficient suppression of Brillouin scattering of a single-frequency laser source in a 72 m-long Neodymium-doped fiber amplifier by simultaneous amplification of two seed lasers separated in wavelength by two times the Brillouin-shift.
		Horowitz, A.R. Chraplyvy, R.W. Tkach and J.L. Zyskind, “Broad-Band Transmitted Intensity Noise Induced by Stokes and Anti-Stokes Brillouin Scattering in Single-Mode Fibers,” IEEE Photon.
		Cotter, “Suppression of stimulated Brillouin scattering during transmission of high-power narrowband laser light in monomode fibre,” Electron.
	www.opticsexpress.org /abstract.cfm?URI=OPEX-12-19-4443 (334 words)

	[No title]
		Brillouin scattering can be combined with synchrotron XRD and other experimental techniques (e.g.
		Our emphasis is now is on increasing pressure and temperature limits of Brillouin measurements, performing elasticity measurements simultaneously at high pressures and temperatures, and advancing the technology of working with samples not possible before (polycrystals, opaque materials).
		Brillouin measurements on polycrystalline silicates Jennifer M. Jackson, Stanislav V. Sinogeikin, Jianzhong Zhang, and Jay D. Bass University of Illinois at Urbana-Champaign Brillouin scattering is an optical spectroscopic method that measures the sound velocities of material.
	ijolite.geology.uiuc.edu /EGC2004/EGC_2004_Abstracts.doc (1943 words)

	Experiment
		Stimulated Brillouin scattering is a three-wave parametric mixing process coupling two radiation fields (an incident pump beam and a reflected Stokes beam) with an acoustic wave in a medium.
		In the focus of the high-power laser beam spontaneous Brillouin scattering of the leading edge of the laser beam occurs.
		The back-scattered part of the Brillouin radiation, called Stokes radiation, interacts with the remaining incident beam causing an acoustic wave in the water.
	www.phys.tue.nl /EPG/epghome/projects/breakdown/breakdown_files/Experiment/Experiment.htm (1132 words)

	Brillouin Spectroscopy Data Base for Biological Threats - Storming Media
		Abstract: Brillouin scattering from biological materials is conducted using a tandem Fabry-Perot interferometer.
		Brillouin scattering from DNA, ovalbumen, the Bacillus spores globigii and thuringiensis were measured to determine the feasibility of biological material discrimination using Brillouin scattering.
		It is concluded that Brillouin spectroscopy has great potential as an optical tool for the detection and discrimination of threat biological materials.
	www.stormingmedia.us /62/6211/A621124.html (163 words)

	CHP - Scattering (Site not responding. Last check: 2007-10-28)
		Light that is scattered at the same wavelength as the incoming light is called Rayleigh scattering.
		Light that is scattered in transparent solids due to vibrations (phonons) is called Brillouin scattering.
		Light that is scattered due to vibrations in molecules or optical phonons in solids is called Raman scattering.
	www.chem.vt.edu /chem-ed/spec/scattering.html (104 words)

	Optical homodyne detection - Patent 4977620
		A method as in claim 8 wherein said amplifying step is achieved using narrow line-width stimulated Brillouin scattering in a waveguide excited by a local optical pump source having a frequency offset from said carrier signal frequency.
		Preferably, the characteristics of the injected radiation and the form of the waveguide are such that stimulated Brillouin scattering occurs.
		As has been explained above, the scattered wave will have a frequency offset from the injected wave and this offset is independent of ambient conditions and depends essentially on the medium defining the optical waveguide and in particular its refractive index, the acoustic velocity in the medium and the wavelength of the injected radiation.
	www.freepatentsonline.com /4977620.html (2286 words)

	Foreword (Site not responding. Last check: 2007-10-28)
		Over a number of years, the Brillouin scattering method became a standard tool in the research of acoustic phonons and magnons of GHz frequency.
		The term Brillouin light scattering (BLS) was derived from the theoretical prediction made by L. Brillouin in 1922 of possible nonelastic interaction between light and sound.
		Then, I examine experimental methods used in Brillouin spectroscopy with special emphasis on sources of experimental errors and low-level signal analysis, and finally, spin waves in the Co/Cu metallic superlattices and in the Co/CoO exchange-bias bilayers.
	zeus.polsl.gliwice.pl /~tblachow/Forbook1.htm (760 words)

	Development of a Brillouin scattering based distributed fibre optic strain sensor. (Site not responding. Last check: 2007-10-28)
		The parameters of the Brillouin spectrum of an optical fibre depend upon the strain and temperature conditions of the fibre.
		As a result, fibre optic distributed sensors based on Brillouin scattering can measure strain and temperature in arbitrary regions of a sensing fibre.
		Also, cross-sensitivity of the Brillouin spectrum to temperature further reduces the accuracy of strain measurement while long acquisition times hinders field use.
	digitalcommons.hil.unb.ca /dissertations/AAINQ68156 (375 words)

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