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Topic: Light emission

	Learn more about Light in the online encyclopedia. (Site not responding. Last check: 2007-11-05)
		The three basic dimensions of light (and of all electromagnetic radiation) are brilliance (or amplitude), color (or frequency), and polarization (or angle of vibration).
		It is a violation of the technical terminology of physics to speak of the "velocity of light;" velocity is reserved for a different use.
		The study of light and the interaction of light and matter is termed optics.
	www.onlineencyclopedia.org /l/li/light.html (956 words)

	Polarized Light Reading
		Light of a single color can be described as a wave with a specified wavelength or as a photon with a specified energy.
		Circularly polarized light incident on a polarizer is transmitted as linearly polarized light.
		The reflected light is polarized in the plane of the reflecting surface.
	acept.la.asu.edu /PiN/rdg/polarize/polarize.shtml (660 words)

	Laser Health Solutions (Site not responding. Last check: 2007-11-05)
		Laser therapy is the use of monochromatic light emission from a low intensity laser diode (250 milliwatts or less) or any array of high intensity Super Luminous Diodes (providing total optical power in the 1000-2000 milliwatt range) to treat musculoskeletal injuries, chronic and degenerative conditions and to heal wounds.
		The light source is placed in contact with the skin allowing the photon energy to penetrate the tissue, where it interacts with various intracellular biomolecules resulting in the restoration of normal cell function and enhancement of the body's healing processes.
		The light from the laser distributes in the tissue in the shape of a ball or an egg.
	www.laserhealthsolutions.com /faq.php (1338 words)

	Controller for a fluorometer - US Patent 6825927 (Site not responding. Last check: 2007-11-05)
		An "emission light detector" as utilized herein is intended to generally mean a light sensor coupled with any necessary optical filters so as to be useful for detection of fluorescent emission, while being essentially insensitive to light at the excitation wavelength.
		In one embodiment, the predetermined light levels are set such that an equal amount of fluorophore in the samples generates a substantially equal amount of signal at the emission light detector, i.e., detection efficiencies are normalized for the samples.
		If the light is outside of the linear range of the emission light detector 30, the gain of the emission light detector 30 (in the case of a PMT) is adjusted, either up or down, to avoid detector saturation or the lower detection limit and move the signal to the middle of the dynamic range.
	www.patentstorm.us /patents/6825927.html (5339 words)

	Biochemical Light Emission (Site not responding. Last check: 2007-11-05)
		One example of a light emitting reaction is the oxidation of aldehydes by the enzyme luciferase.
		Decomposition of the hydroperoxide (along with light emission) is triggered by a conformational change of the protein's structure, releasing some of the interactions.
		This may be accomplished by absorbing the light by some chromophore and splitting the energy into a less energetic photon and thermal energy dissipated as heat.
	www.biologie.uni-hamburg.de /lehre/bza/light/introlight.htm (664 words)

	COPS - Output Highlights - Emission of Light under Control (Site not responding. Last check: 2007-11-05)
		Controlling the emission of light is one of the main goals in science and technology.
		To manipulate the emission of light, the researchers have made photonic crystals consisting of ordered arrays of spherical air voids in the solid material titania, the material that renders paint, paper or toothpaste its whiteness.
		Photonic crystals that delay emission of light and thus store energy may find applications in solar cells: sun light is converted to a high energy state of atoms in a solar cell.
	www.tn.utwente.nl /cops/output/3_h_lifetime_en.html (808 words)

	Encyclopedia of Laser Physics and Technology - laser cavities, laser diodes, laser design, linewidth, laser safety, ...
		A simple scheme for laser cooling is Doppler cooling, where light forces are exerted by absorption and subsequent spontaneous emission of photons, and the rate of these processes depends on the velocity of an atom or ion due to the Doppler shift.
		When calculating light forces on atoms, it is often more convenient to derive the light forces from the gradient of a potential which arises from the interaction of the atoms with the light field.
		Fluorescence is light emission caused by irradiation with light (normally visible or ultraviolet light) and typically occurring within nanoseconds to milliseconds after irradiation.
	www.rp-photonics.com /encyclopedia_l.html (7670 words)

	Light & Optics [encyclopedia] (Site not responding. Last check: 2007-11-05)
		The speed of rotation of the wheels was increased until the light was blocked, allowing calculation of the speed of light from the path length, the size of the gap between the teeth of the wheels, and the rate of rotation.
		Light emitted by the Sun and by incandescent light bulbs consists of a mix of these bands, and is known as "white light".
		The light collecting ability of a telescope is a function of the total amount of light collecting area, which for a reflecting telescope is the size of the mirror, or what is known as the telescope's "aperture".
	kosmoi.com /Science/Physics/Optics (5643 words)

	Patent 4395658: Proper light emission indicating device for computer flash device
		One type of such computer flash unit emits light from a flash tube and senses light reflected from the object with a light sensing element so that as soon as the amount of light sensed reaches a predetermined value, the emission from the flash tube is interrupted.
		In the light measuring circuit, a light sensing element 43 senses the light reflected from the object (not shown in the drawing).
		When the amount of the light incident upon the light sensing element reaches a predetermined amount, the output of the comparator 51 is inverted by means of the charge voltage of the integrating capacitor 45.
	www.freepatentsonline.com /4395658.html (2710 words)

	Light-emission control apparatus camera apparatus and light-emission control method - US Patent 6345155 (Site not responding. Last check: 2007-11-05)
		To cause the light-emitting section 21 to stop emitting light, the control signal the control section (not shown) has generated in response to a light-emission stop request is supplied to the switch 22, whereby the switch 22 disconnects the capacitor 24 from the light-emitting section 21.
		However, the emission of light can be controlled with higher precision by lowering the output gain of the element 2 to prevent the saturation of the element 2 as in the present invention.
		In this case, it is inferred that the light reflected from the object is not sufficiently intense, and measures are taken to modify the image.
	www.patentstorm.us /patents/6345155.html (6491 words)

	Light emission moves into the blue (February 1998) - Physics World - PhysicsWeb
		The key point is that the wavelength of the emitted light, and hence its colour, is determined by the band gap of the active layer.
		To determine the energy levels responsible for emission and absorption, we measured the light emitted when a current of 20 mA was applied to the structure (electroluminescence) and when monochromatic light was focused on the device (the photocurrent spectrum).
		All of the electroluminescence is observed at the lower tail of the absorption spectra, suggesting that light emission results from the recombination of electrons and holes at deep localized states with energies of 290 and 570 meV.
	www.physicsweb.org /article/world/11/2/12 (3371 words)

	Broadly-tunable resonant-cavity light emission using a deformable-membrane top mirror (Site not responding. Last check: 2007-11-05)
		The resonant cavity light emitting diode (RCLED) [1] consists of a light-emitting active region placed within a resonant optical cavity and is a potential light source in applications such as wavelength division multiplexing, optical fiber communications, and free-space optical interconnects.
		The quantum wells are placed at the antinode of the optical mode for microcavity-enhanced light emission, and this antinode is predicted to spatially shift less than 20 nm over the tuning range of the device.
		This peak may result from nonresonant light emission from the perimeter of the device where no membrane is present but where current is still being injected from the p-contact.
	luciano.stanford.edu /~larson/rcled.html (1894 words)

	Discussion - 2000JB000015
		Emission is observed both in freshwater and seawater and does not appear to be wavelength dependent in the 380–600 nm region.
		At Dudley Flange, excess light emission in the 500–550 nm band is observed in the vicinity of this material.
		An attempt was made to analyze light emission from both the structure itself and the fluid emanating from it.
	www.agu.org /pubs/sample_articles/bg/2000JB000015/6.shtml (1700 words)

	LED Light Emission (Site not responding. Last check: 2007-11-05)
		The light radiated by an incandescent or halogen lamp contains the full spectrum of visible light wavelengths, most of which is wasted when filtered by colored glass or plastic lenses covering the bulb and is easily diffused by other interfering light sources.
		The light emitted by an LED, on the other hand, is a narrow wavelength of visible light.
		LED light can be seen at great distances with very little diffusion, and without the white-flash "washout" of traditional lighting.
	www.911ep.com /lightemission.html (134 words)

	Atomic Absorption and Emission Spectra
		The emission lines correspond to photons of discrete energies that are emitted when excited atomic states in the gas make transitions back to lower-lying levels.
		An absorption spectrum occurs when light passes through a cold, dilute gas and atoms in the gas absorb at characteristic frequencies; since the re-emitted light is unlikely to be emitted in the same direction as the absorbed photon, this gives rise to dark lines (absence of light) in the spectrum.
		Emission or absorption processes in hydrogen give rise to series, which are sequences of lines corresponding to atomic transitions, each ending or beginning with the same atomic state in hydrogen.
	csep10.phys.utk.edu /astr162/lect/light/absorption.html (408 words)

	The paper
		In the light photosystem II feeds electrons to photosystem I. The electrons are transferred from photosystem II to the photosystem I by intermediate carriers.
		Plant photosynthesis is driven primarily by visible light (wavelengths from 400 to 700 nm) that is absorbed by pigment molecules (mainly chlorophyll a and b and carotenoids).
		Light is collected by 200-300 pigment molecules that are bound to light- harvesting protein complexes located in the photosynthetic membrane.
	www.life.uiuc.edu /govindjee/paper/gov.html (12489 words)

	Product Category Results (Site not responding. Last check: 2007-11-05)
		Spectrometers, All Types (332 companies) Spectrometers are analytical instruments in which an emission (as of particles or radiation) is dispersed according to some property (as mass or energy) of the emission and the amount of dispersion is measured.
		Light Emitting Diodes (LED) (282 companies) Light-emitting diodes (LED) are PN junction devices that give off light radiation when biased in the forward direction.
		Light Curtains (76 companies) Light curtains are photoelectric transmitters that project an array of synchronized,parallel infrared light beams to a receiver unit.
	globalspec.com /ProductFinder/FindProducts?query=light+emission+... (536 words)

	Light emission from cavitating water
		Light has been detected from the vaporous cavitation induced in flowing tap water by a fall in pressure as it passed through the constriction of a Venturi tube.
		The light could be enhanced by the addition of a small quantity of carbon disulphide; sonoluminescence in water is also enhanced by the addition of this liquid.
		The intensity of the cavitation and of the light was also enhanced by increasing the proportion of air in the tap water, but if too much air was introduced the cavitation and light emission ceased.
	stacks.iop.org /0508-3443/15/321 (255 words)

	Lymph Detoxification® - Light Emission Therapy
		In clinical research we use a photon particle light beam generator utilizing neon/argon gases at a certain frequency range to break-up lymph stasis.
		This allows the therapist to work on tissue that is more pliable because it is in a state of free flow and as such it is an ideal state for effective treatments.
		Light Emission Therapy™ is completely non-invasive and safe in the hands of a trained practitioner.
	www.lymphdetox.com /let.htm (324 words)

	Tumbling Stone 8 - Light - Spectral Emission (Site not responding. Last check: 2007-11-05)
		In general, all the light absorbed by the object makes its temperature rise, but some wavelengths are absorbed more than others, and this gives to the object its characteristic color (for example, white surfaces scatter light of all wavelengths equally and fl surfaces absorb all light).
		Furthermore, when light is reflected by a surface made of a certain chemical material, its spectrum is normally changed, since every material and every chemical element reacts differently with light.
		It is very interesting to observe that the incident sunlight and the reflected light have the same wavelength dependence...
	spaceguard.rm.iasf.cnr.it /tumblingstone/issues/num8/light/emission.htm (257 words)

	Patent 5060236: Semiconductor light emission system
		The present invention relates to a semiconductor light emission system, and is particularly concerned with a semiconductor laser capable of controlling a radiant power on a small current.
		According as a current level to be injected is further raised, an inductive emission begins presently, as shown in the characteristic curve of FIG.
		In the bipolar transistor part according to the invention, an emitter current is controlled by the current injected into a base, a current injected into the semiconductor laser part is controlled consequently, and thus a radiant power is controlled thereby.
	www.freepatentsonline.com /5060236.html (2342 words)

	Light emission from nanostructured silicon - UNITN (Site not responding. Last check: 2007-11-05)
		Silicon nanostructures (Si-nc) is a very active field of research because their efficiency for light emission is much higher than for bulk silicon.
		In this project we propose to investigate light emission from silicon in the form of porous silicon.
		If light emission from nanocrystals is still efficient in this environment, this would allow to employ them as markers in biological solutions.
	www.unitn.it /en/internazionale/area_ric/projects/spagna.htm (321 words)

	Mutation of a Protease-sensitive Region in Firefly Luciferase Alters Light Emission Properties -- Thompson et al. 272 ...
		The kinetics of light emission can be modulated by coenzyme A, but this is not a required substrate (3, 4).
		After 3 h, the light emission had decayed to only 40% of the maximum value, which was recorded at 22 min.
		Light emission data from 4 µl of crude cell extracts of recombinant proteins assayed
	www.jbc.org /cgi/content/full/272/30/18766 (3647 words)

	The Manila Times Internet Edition \| ENTERTAINMENT > Improving spontaneous light emission (Site not responding. Last check: 2007-11-05)
		Whereas the stimulated emission of light is the basis of laser operation, spontaneous emission tends to waste energy in optoelectronic devices.
		The large contrast in the refractive index of the GaInAsP and the air holes meant that photons with a certain range of wavelengths—which is known as the “photonic band gap”—cannot travel through the crystal.
		They observed that when the emission spectrum of a sample lay inside the photonic band gap, the overall spontaneous emission rate was reduced by a factor of five.
	www.manilatimes.net /national/2005/jun/07/yehey/enter/20050607ent4.html (312 words)

	3.Light Emission Characteristics (Site not responding. Last check: 2007-11-05)
		We evaluated the light emitting spot shape of the LED array and printing quality when this array is used.
		(Figure 8) shows a photograph of the light emitting spot shape and the light intensity distribution of the edge-emitting LED array after transmitting through the rod-lens array.
		The light emitting spot shape is circular after transmitting through the rod-lens array.
	www.oki.com /en/otr/html/nf/otr-158-5-3.html (161 words)

	Presented at 2001 Denver X-ray Conference, Steamboat Springs,
		Fluorescent light has been detected recently along with Rb, Ba, Tb, Cu, Mo, or Ag X-rays during g- excitation of Rubidium sulphate, Barium oxide, or Terbium peroxide salt, and Cu, Mo, or Ag metal notably at room temperature (Variable Energy X-ray source, AMC 2084, UK).
		The current study disclosed that light photons follow the emission of X-rays, g-rays, and b-particles from one and the same excited atom in the case of both X-ray and radioisotope sources, which is a significant finding in atomic sciences.
		This explains the fluorescent light emission detected from opaque salts, and metals notably at room temperature when present as X-ray and radioisotope sources.
	members.rediff.com /raomap123/2001DenveX-ray.htm (325 words)

	Surface plasmon-polariton mediated light emission through thin metal films
		The emission of light by sources in close proximity to a thin metallic film is dominated by surface plasmon-polariton modes supported by that film.
		We show that the photoluminescence emission from a structure containing a microstructured thin metal film that supports coupled SPPs is over 50 times greater than that from a similar planar structure.
		Similar strong photoluminescence emission is also exhibited by a sample that contains a planar metal film coated with a microstructured dielectric overlayer.
	www.opticsexpress.org /abstract.cfm?URI=OPEX-12-16-3673 (540 words)

	Energy levels, Electrons, Holes, Light Emission
		So what is the crudest way to achieve light emission.
		One surface (at least) is transparent so that light can be emitted and the other surface is usually acting like a metal-mirror.
		Also the recombination process is a statistical process with a given probability (dictated by the device and material fine structure).
	www.ee.technion.ac.il /people/nir/simple.htm (583 words)

	Session DA - Bubbles III.
		The calculated shape, width, intensity, and spectrum of the light pulses, as well as their dependence on experimental parameters, are found to be in good agreement with experiment.
		have shown the emission of light from the vigorous asymmetric collapse in the form of a very high speed jet near a rigid boundary.
		The Göttingen studies indicate that a rapid increase in the emission of light occurs beyond a critical ``stand-off'' distance of the cavitation bubble from the boundary.
	flux.aps.org /meetings/YR98/BAPSDFD98/abs/S2600.html (1369 words)

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