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Topic: Coherent radiation

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	Department of Energy Information Bridge - full-text scientific and technical reports (gray literature)
		Coherent radiation emitted from a relativistic electron bunch consists of wavelengths longer than or comparable to the bunch length.
		Coherent transition radiation emitted from subpicosecond electron bunches at the Stanford SUNSHINE facility is observed in the far-infrared regime through a room-temperature pyroelectric bolometer and characterized through the electron bunch-length study.
		Hence, the radiation spectrum and the bunch length are deduced from the autocorrelation measurement.
	www.osti.gov /bridge/product.biblio.jsp?osti_id=486022 (339 words)

	High power efficient frequency conversion of coherent radiation with nonlinear optical elements
		The present invention relates to methods and apparatus for converting the frequency of coherent radiation, and particularly to frequency conversion methods and apparatus using nonlinear optical elements, such as crystals having nonlinear optical coefficients which are useful for tripling the frequency of a beam of input coherent radiation.
		It is a further object of the invention to provide improved methods and apparatus for converting the frequency of coherent radiation which overcomes the limitation of reconversion of the frequency of the beam from the desired output frequency back into an input frequency thereof in the nonlinear optical elements in which frequency conversion occurs.
		The frequency of the radiation is doubled in the crystal with efficiency of approximately 67% (preferably near the peak of the efficiency characteristic) due to the energy relationships obtained by the orientation of the polarization directions of the beam with respect to the crystal.
	www.freepatentsonline.com /4331891.html (5836 words)

	Coherent bremsstrahlung (Site not responding. Last check: 2007-10-16)
		A drawback of the dual-rotation procedure is that the coherent enhancement is less when a single lattice vector contributes than when a whole row of vectors contribute, a factor of 3 for diamond on the (0,2,2) vector.
		Since for thin radiators the radiation probability is roughly uniform throughout the crystal, the effective beam distribution is an average over radiation depth.
		The primary collimator at SLAC was 70 radiation lengths of tungsten with a 2mm-diameter-bore.
	www.fnrf.science.cmu.ac.th /theory/radiation/coherent-bremsstrahlung.html (6506 words)

	Coherent Terahertz Synchrotron Radiation
		When the wavelength of synchrotron radiation is comparable to the length of an electron bunch in the storage ring, or the length of any structure on the bunch, the radiation from multiple electrons is in phase, resulting in a quadratic rather than the usual linear dependence of the power emitted on the number of electrons.
		However, when the wavelength of the emitted radiation is comparable to the length of an electron bunch, the electrons emit in unison rather than as individuals.
		This coherent emission results in a dramatic increase in the power emitted (proportional to the square of the number of electrons), thereby also generating a wave of enthusiasm among scientists who are potential users of coherent synchrotron radiation (CSR).
	www-als.lbl.gov /als/science/sci_archive/61coherent.html (1036 words)

	System and method for generating coherent radiation at ultraviolet wavelengths - US Patent 6373869 (Site not responding. Last check: 2007-10-16)
		OPO 120 is pumped by one portion of the 532 nm beam 115 to produce a beam of radiation 125 at a wavelength of 703 nm.
		Laser 312 is retrofitted with a small dot Gaussian mirror reflector to configure the pulses of coherent radiation to have a uniform mode of approximately 5 mm diameter, which in turn increases the efficiency of pumping the OPO 120.
		A dichroic mirror M5 reflects radiation at a wavelength of 266 nm and transmits radiation at a wavelength of 703 nm and therefore combines the 703 nm beam 125 from OPO 120 with the 266 nm beam 135 from frequency doubler 130.
	www.patentstorm.us /patents/6373869.html (7340 words)

	laser. The Columbia Encyclopedia, Sixth Edition. 2001-05
		The coherent light produced by a laser differs from ordinary light in that it is made up of waves all of the same wavelength and all in phase (i.e., in step with each other); ordinary light contains many different wavelengths and phase relations.
		Electromagnetic radiation (e.g., light or microwaves) is emitted or absorbed by the atoms or molecules of a substance only at certain characteristic frequencies.
		This produces a sudden burst of coherent radiation as all the atoms discharge in a rapid chain reaction.
	www.bartleby.com /65/la/laser.html (976 words)

	Influence of Relaxation Phenomena on Coherent...
		Coherence is central to quantum information (including communication, computing and cryptography), coherent quantum control of reaction processes, and laser physics.
		Such transitions are advantageous in the generation of coherent electromagnetic radiation and also provide the basis for the spectroscopic investigation of the electronic structure and optical properties of materials.
		We have also been concerned with applications to coherent radiation processes involving energetic electron beams propagating in a crystal lattice, which gives rise to organized (or collective) electric fields and to radiation processes that are distinct from those in amorphous solids.
	cst-www.nrl.navy.mil /~erwin/projects/vlj.html (1270 words)

	Theory of coherent transition radiation generated at a plasma-vacuum interface
		Transition radiation generated by an electron beam, produced by a laser wakefield accelerator operating in the self-modulated regime, crossing the plasma-vacuum boundary is considered.
		Diffraction radiation from the finite transverse extent of the plasma is considered and shown to strongly modify the spectra and energy radiated for long wavelength radiation.
		This method of transition radiation generation has the capability of producing high peak power THz radiation, of order 100 (mu)J/pulse at the plasma-vacuum interface, which is several orders of magnitude beyond current state-of-the-art THz sources.
	repositories.cdlib.org /lbnl/LBNL-53228 (187 words)

	Coherent radiation from the electrons in a synchrotron
		The coherent radiation emitted by the electrons in a synchrotron has been studied experimentally at a wavelength of 10 cm for various electron distributions within the phase stable region.
		In the majority of cases these experiments confirm the theory of coherent radiation from electrons but deviations from the theory are observed for electron distributions which approach uniformity.
		The emitted radiation has been used to measure the frequency of the electron phase oscillations and also the adiabatic damping of the phase oscillation amplitudes.
	stacks.iop.org /0368-3281/3/213 (258 words)

	Method and apparatus for generating coherent radiation
		a directional coupler positioned between the source of radiation and the optical waveguide ring and the relatively broad linewidth radiation is guided by said directional coupler to the ring along a first path while the relatively narrow linewidth wave is separated from the first path by said directional coupler and guided to an output port.
		There is now a requirement for the generation of relatively narrow linewidth coherent radiation and to achieve this it has been necessary to construct highly accurate and therefore expensive radiation sources.
		The characteristics of the broad linewidth radiation and the form of the waveguide ring must be such that scattering occurs.
	www.freepatentsonline.com /4780876.html (1474 words)

	Subject DDB (Detail) (Site not responding. Last check: 2007-10-16)
		Coherent radiation in the wavelength regions of millimeter, submillimeter and THz takes place from bunched electrons accelerated by a linac.
		For practical use of the coherent radiation in condensed matter physics, its radiation mechanism and characteristics are investigated with an L-band linac.
		Toshiharu Takahashi et al: "Utilization of coherent transition radiation from a linear accelerator as a source of millimeter-wave spectroscopy", Rev. Sci.
	dolphin.tokyo.jst.go.jp /ddbs/plsql/KDI_EG_49?code=9800035277 (149 words)

	Microstructures Emit Coherent IR Radiation - June, 2002 (Site not responding. Last check: 2007-10-16)
		To enable them to observe the coherent radiation, the researchers coupled the surface waves to those propagating from the material-air interface.
		To verify that the phenomenon was due to coupling of the surface wave, the researchers measured the emissivity for s- and p-polarization, finding no peaks for s-polarization and none for p-polarization in the spectral regions where there should be no surface waves.
		He also suggested that the design could be used to produce sources of coherent thermal radiation that emit in only one direction.
	www.photonics.com /spectra/tech/XQ/ASP/techid.1390/QX/read.htm (442 words)

	Coherent Inc. : Manufacturer of Lasers : World Leader in Photonics
		Founded in 1966, Coherent, Inc. is a world leader in providing superior laser reliability and performance.
		Coherent provides laser-based solutions, laser measurement instruments, and optical components to a broad base of commercial and scientific research customers.
		The new Chameleon-XR, with a tuning range of 705-980 nm, enables deeper tissue imaging due to less light scatter.
	www.coherentinc.com (96 words)

	Excess noise for coherent radiation propagating through amplifying random media
		A general theory is presented for the photodetection statistics of coherent radiation that has been amplified by a disordered medium.
		The transmitted radiation is measured by a photodetector.
		is the excess noise due to beating of the coherent radiation with the spontaneous emission.
	www.ilorentz.org /~patra/quantumoptics/qo2/index.html (3155 words)

	ENEA INN/FIS/LAC - Free Electron Laser Laboratory
		The physical mechanism that produces coherent emission in a Free Electron Laser is the interaction between a relativistic electron beam and a magnetostatic field with a particular spatial configuration, while in a conventional laser the stimulated emission from an atomic or a molecular system is exploited.
		The parameters of the emitted radiation are reported in table 2 and the tuning capability of the system is shown in fig.
		This project was aimed at the realisation of a coherent source to be utilized, in collaboration with INFN - Trieste and Paul Scherrer Institute - Villigen (CH), in a fundamental physics experiment, to measure the QED corrections to the energy levels of a muonic hydrogen atom.
	www.frascati.enea.it /fis/lac/fel/fel2.htm (2034 words)

	Tailus Industries Aerospace > Coherent Radiation (Site not responding. Last check: 2007-10-16)
		Noun, Science, Physics (Plasma, Fusion Or Energy Research): Any form of radiation in which the phase relationship between sections of the wave at different locations is not random (or incoherent!).
		Typical example is a laser beam, in which the phase is more or less uniform across the beam, and changes along the beam in accordance with the wavelength.
		Radiation in which the photons tend to "agree" with one another, rather than being randomly distributed.
	www.aero.tailus.com /glossary/c/o/h/erent-radiation/index.html (92 words)

	Terahertz radiation: applications and sources - The Industrial Physicist
		Also, because terahertz radiation is readily absorbed by water, it can be used to distinguish between materials with varying water content—for example, fat versus lean meat.
		For example, Gerald Fraser’s group at the National Institute of Standards and Technology is frequency mixing the output of a near-IR, fixed-frequency diode laser with that of a tunable Ti:sapphire laser in a lowtemperature- grown gallium arsenide photomixer fabricated with the appropriate antenna pattern.
		Although the practical application of terahertz radiation is in its infancy, the recent availability of reliable sources in the 0.3- to 5-THz range may have a wide-ranging impact on science, industry, and medicine.
	www.aip.org /tip/INPHFA/vol-9/iss-4/p27.html (2034 words)

	Evaluation of Electron Bunch Shapes Using the Spectra of the Coherent Transition Radiation
		Single-bunch electron beams generated with the 38 MeV L-band linear accelerator are being used for experiments of the self-amplified spontaneous emission and the coherent radiation at the Institute of Scientific and Industrial Research in Osaka University.
		The spectrum of the coherent radiation emitted from an electron bunch is determined by the bunch shape.
		In this work, the bunch shape was evaluated from the longitudinal bunch form factor which was given by the spectrum of the coherent transition radiation measured with a Martin-Pupplet interferometer in a wavenumber range of 2-25 cm-1.
	www.fel.duke.edu /fel2000/program/book/node67.html (242 words)

	KENTEK Laser Glossary (Site not responding. Last check: 2007-10-16)
		The radiation incident at the surface is absorbed in the underlying tissue, increasing the temperature of the tissue to the level at which damage can occur, and laser burns result.
		RADIANT INTENSITY: Radiant power, or flux, expressed as emission per unit solid angle about the direction of the light in a given length of time.
		WAVE: An undulation or vibration, a form of movement by which all radiant energy of the electromagnetic spectrum is thought to travel.
	www.kentek-laser.com /helpers/glossary.htm (3884 words)

	Terahertz breakthrough at BESSY (March 2003) - News - PhysicsWeb
		Synchrotron radiation is produced when bunches of charged particles, usually electrons that have been accelerated to close to the speed of light, are forced to move in a circular orbit by strong magnetic fields.
		Terahertz radiation is found at the low-energy end of the spectrum and corresponds to wavelengths between about 1 mm and 15 microns.
		Synchrotron radiation is usually incoherent because the bunches - which contain billions of electrons each - are longer than the wavelengths they are emitting.
	physicsweb.org /article/news/7/3/9 (369 words)

	AllRefer.com - Aleksandr Mikhailovich Prokhorov (Physics, Biography) - Encyclopedia
		In 1923 he was taken to the Soviet Union by his parents, who had emigrated to Australia to escape the czarist regime.
		In 1947 he began his research into the coherent radiation of electrons, followed by pioneering work in the field of radio-frequency spectroscopy.
		With N. Basov he created an oscillator based on the stimulated emission of electromagnetic waves by the excited molecules of a molecular beam.
	reference.allrefer.com /encyclopedia/P/Prokhoro.html (244 words)

	NSLS Infrared Synchrotron Radiation Publication List
		Investigation of Coherent Emission from the NSLS VUV Ring (Proceeding of 1999 Particle Accelerator Conference).
		Observation of coherent synchrotron radiation from the NSLS VUV ring, Nuclear Instruments and Methods in Physics Research A 463 387 (2001).
		The detailed characteristics of the bursts of coherent synchrotron radiation from the VUV ring are reported and compared with models of longitudinal instabilities.
	pubweb.bnl.gov /people/carr/pdf/pub_list.html (764 words)

	seminar
		Coherent radiation (CB) and channeling radiation (CR): history, validity conditions...
		- Influence of the motion types on coherent radiation (CB at dynamical chaos conditions,...), X-ray coherent radiation, simulation of spectrum and polarization of coherent radiation, radiation by relativistic electrons and positrons in oriented crystals, theory and Kharkov experiment for 1 GeV electron energy, new experiment proposals on CB and CR at Frascati.
		- Coherent radiation at collisions of short bunches of relativistic particles.
	www.lnf.infn.it /seminars/shulga_10_12_03.html (149 words)

	Coherent Radiation Processes in Crystals (Site not responding. Last check: 2007-10-16)
		An interdisciplinary theoretical and computational program is under way for investigating coherent electromagnetic interactions in electron beams and solids (bulk crystals and semiconductor heterostructures).
		Particular emphasis is placed on coherent bremsstrahlung and on channeling radiation, which are emitted by energetic electrons that traverse crystal lattices.
		Using a quantum-open-systems (reduced-density-matrix) formulation, a unified description is provided for coherent (resonant) interactions on a formally equal footing with decoherence (dephasing) and relaxation.
	www4.nas.edu /pga/rap.nsf/ByTitle/64.15.85.B2857?OpenDocument (162 words)

	Coherent Synchrotron Radiation in the Isochronous Muon Collider Ring (ResearchIndex) (Site not responding. Last check: 2007-10-16)
		Abstract: We show that the coherent (shielded) synchrotron radiation is negligible in a 4 TeV c-of-m muon collider.
		I INTRODUCTION To achieve the luminosity of L = 10 35 cm -2 s -1 in a µ + µ - collider [1], two bunches per sign of N = 2 × 10 12 particles each and a betatron function of # # = 3 mm at the interaction point (IP) are required.
		2 Suppression of coherent radiation by electrons in a synchrot..
	citeseer.ist.psu.edu /179252.html (340 words)

	It is known well that an atom exposed by high intensive laser radiation (I 1014 W/cm2) provide a unique source of ... (Site not responding. Last check: 2007-10-16)
		It is known well that an atom exposed by high intensive laser radiation (I 1014 W/cm2) provide a unique source of coherent radiation in extreme ultraviolet region of the spectrum
		Good qualitative and quantitative models were developed to describe various aspects of the generation process for the case of long laser pulses when the change of electric field is negligible on the optical cycle scale.
		In particularly, the efficiency of XUV generation becomes dependent from very unusual parameter of laser radiation – carrying phase of the electric field in the laser pulse.
	home.rclph.spbu.ru /journal/articles_2000_2/Section_1/Kartashov/Kartashov.htm (530 words)

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