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Topic: Active laser medium

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  Active laser medium - Wikipedia, the free encyclopedia
Within a laser, the active laser medium is the material that exhibits optical gain.
This gain is generally generated by stimulated emission on electronic or molecular transitions to a lower energy state, starting from a higher energy state to which it had been previously stimulated by means of a pump source.
in semiconductors, or in gases via high-voltage discharges) or with light, which may be generated with discharge lamps or with other lasers.
en.wikipedia.org /wiki/Active_laser_medium   (199 words)

 Laser article - Laser quantum mechanical effect stimulated emission coherent collimated - What-Means.com   (Site not responding. Last check: 2007-11-06)
A Laser (light amplification by stimulated emission of radiation) is a device which uses a quantum mechanical effect, stimulated emission, to generate a coherent beam of light.
The medium may then amplify light by the process of stimulated emission, which if the light is fed back through the medium by means of a cavity resonator, will continue to be amplified into a high-intensity beam.
Erbium-doped fiber lasers, a type of laser formed from a specially made optical fiber, which is used as an amplifier for optical communications.
www.what-means.com /encyclopedia/Laser   (1418 words)

 Laser - Wikipedia   (Site not responding. Last check: 2007-11-06)
Laser was originally an acronym for "Light Amplification by Stimulated Emission of Radiation".
The common image of a bright beam of light emitted from a laser is a consequence of light being scattered from dust and air particles in the beam, rather than the beam itself.
The medium may then amplify light by the process of stimulated emission, which if the light is fed back through the medium by means of an optical resonator[?], will continue to be amplified into a high-intensity beam.
wikipedia.findthelinks.com /la/Laser.html   (1034 words)

 Laser - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-11-06)
A laser (Light Amplification by Stimulated Emission of Radiation) is a device which uses a quantum mechanical effect, stimulated emission, to generate a coherent beam of light from a lasing medium of controlled purity, size, and shape.
The output of a laser may be a continuous, constant-amplitude output (known as CW or continuous wave), or pulsed, by using the techniques of Q-switching, modelocking, or gain-switching.
The basic physics of lasers centres around the idea of producing a population inversion in a laser medium by "pumping" the medium; i.e., by supplying energy in the form of light or electricity, for example.
www.leessummit.us /project/wikipedia/index.php/Laser   (2169 words)

 Lasers, laser light shows, laser widows and laser lights for DJ's, clubs and parties.
In analogy with optical lasers, a device which produces any particles or electromagnetic radiation in a coherent state is also called a "laser", usually with indication of type of particle as prefix (for example, atom laser.) In most cases, "laser" refers to a source of coherent photons, i.e.
Laser light is typically near-monochromatic, i.e., consisting of a single wavelength or color, and emitted in a narrow beam.
The laser was proposed as a variation of the maser principle in the late 1950s, and the first laser was demonstrated in 1960.
www.eliminatorlightingdirect.com /Lasers_s/72.htm   (1211 words)

 Rami Arieli: "The Laser Adventure"
This laser emits in the blue - green visible spectrum, primarily at 488 and 515 [nm].
The active medium is an "Excited Dimer" which does not have a stable ground state.
A solid state laser which use a crystal of sapphire (aluminum oxide) containing trace amounts of chromium oxide as an active medium.
www.phys.ksu.edu /perg/vqm/laserweb/glossary/glossary.htm   (1978 words)

 ICP-MS Short-course: Part 4
A laser is a device that produces a narrow, pulsed or continuous beam of monochromatic, coherent light in the visible, infrared (IR) or ultraviolet (UV) regions of the electromagnetic spectrum.
The photons produced in the laser medium are reflected off these mirrors and oscillate repeatedly through the laser medium, causing yet further photons to be emitted by active species in the exited state and hence amplifying the intensity of light produced.
The interaction between UV laser light and most solids tends to involve mostly a physical ablation process of mechanical break-up, whereas IR laser light may often cause a greater degree of sample heating and melting which is generally undesirable for quantitative analysis as it may lead to trace element fractionation.
web.uct.ac.za /depts/geolsci/facilities/icpms/lectures/lec4.html   (1521 words)

 Laser - Open Encyclopedia   (Site not responding. Last check: 2007-11-06)
If the light is circulating through the medium by means of a cavity resonator, and the gain (amplification) in the medium is stronger than the resonator losses, the power of the circulating light can rise exponentially.
At wavelengths which the cornea and the lens can focus well, the coherence and low divergence of laser light means that it can be focused by the eye into an extremely small spot on the retina, resulting in localised burning and permanent damage in seconds or even faster.
Holmium-doped YAG, 2096 nm, a efficient laser operating in the infrared, it is strongly absorbed by water-bearing tissues in sections less than a millimeter thick.
open-encyclopedia.com /Laser   (1545 words)

 Laser Glossary
CO laser beam delivery device consisting of a series of hollow tubes and mirrors interconnected in such a manner as to maintain alignment of the laser beam along the path of the arm.
A laser in which an axial flow of gas is maintained through the tube to replace those gas molecules depleted by the electrical discharge used to excite the gas molecules to the lasing.
In the case of a laser the usable diameter is the diameter of the laser beam or a smaller aperture which restricts a laser beam.
www.chem.purdue.edu /chemsafety/Rad/LaserGlossary.htm   (5248 words)

 Distributed feedback laser - Patent 4866730
A distributed feedback laser according to claim 1 further comprising an imaging device, interposed between the optical pattern means and the demagnifying optical means, for producing a striped intermediate image of said radiation pattern in an object plane of the demagnifying optical means.
The present invention relates to a laser with distributed feedback, of the kind comprising an active laser medium, a beam path for a pump radiation beam, an optical device, such as a diffraction grating, and an optical imaging system interposed between the optical device and the laser medium.
In a laser of the general type and with the characteristics set forth above, the invention resolves the problem of avoiding the described disadvantages of the known and proposed arrangements with minimal investment, and concurrently enables broad-spectrum adjustment of the wavelength of the generated laser emission by the simple shifting of one component.
www.freepatentsonline.com /4866730.html   (2201 words)

 Introduction to Laser Processing - My Industry - Applications & Equipment > Welding > Laser Processes | Linde ...   (Site not responding. Last check: 2007-11-06)
The two laser types generate light in the infrared range of the spectrum, which means that the laser beam itself is not visible.
After the laser beam exits the resonator it is directed through the beam path to the cutting or welding head, where it is focused onto the material surface.
In laser cutting factors like drive technology, material gauge and the size of the working envelope will favor one or the other design; in laser welding the choice will be influenced more by factors like the clamping system, the weld edge preparation or the material handling concept.
www.us.lindegas.com /International/Web/LG/US/likelgus.nsf/docbyalias/ind_mv_laser1   (379 words)

 Fundamentals of Lasers with Liquid Media
Active mediums have a certain refractive index, which determines the intensity, polarization, and output wavelength.
Gas lasers have a gas/gas combination as their active laser medium, such as the helium-neon laser that emits light of wavelength 632.8nm.
Liquid lasers have not had the attention of most laser types over the years such as solid state lasers and semiconductor lasers due mostly to the temperature dependence of the index of refraction of the media and the toxicity of some of the components used in the media.
www.u.arizona.edu /~tlh/Report.htm   (1443 words)

 Tactical High Energy Laser - Wikipedia, the free encyclopedia
The Tactical High-Energy Laser, or THEL, is a laser developed for military use.
The cooperative Tactical High Energy Laser (THEL) Demonstrator ACTD was initiated by a memorandum of agreement between the United States and the Government of Israel on July 18, 1996.
The THEL is a high-energy laser weapon system that uses proven laser beam generation technologies, proven beam-pointing technologies, and existing sensors and communication networks to provide a new active defense capability in counter air missions.
en.wikipedia.org /wiki/Tactical_high_energy_laser   (400 words)

 Thinklasers.com - Learn - LASER   (Site not responding. Last check: 2007-11-06)
LASER is an acronym for: Light Amplification by Stimulated Emission of Radiation and it is different from the everyday light you see.
His laser was only able to emit pulsed operation due to the three different energy level transitioning utilized to construct the laser.
For a laser to function properly, the active medium must be "pumped" by an external energy source, usually a battery powered pump-diode.
www.thinklasers.com /Learn_laser.htm   (834 words)

 Olympus Microscopy Resource Center: Physics of Light and Color - Diode Lasers: Interactive Java Tutorial
In all lasers, it is necessary for energy transitions to occur among electrons in the lasing medium, and some of these must involve the emission of photons (categorized as optical transitions).
In non-semiconductor lasers, which typically employ a single gas or gas mixture as the active laser medium, electron energy transitions occur within populations of individual atoms or molecules to produce the required population inversions.
In a typical laser, the light produced is confined to the active medium, and opposing mirrors are utilized to produce multiple reflections within the medium in order to increase the gain in light output from the laser cavity.
www.olympusmicro.com /primer/java/lasers/diodelasers   (3136 words)

 Laser Fundamentals   (Site not responding. Last check: 2007-11-06)
Active mediums contain atoms whose electrons may be excited to a metastable energy level by an energy source.
Laser radiation will continue to be produced as long as energy is applied to the lasing medium.
If energy is continuously pumped into the active medium an equilibrium may be achieved between the number of atoms raised to a metastable state and the number of photons emitted resulting in a continuous laser output.
www.safetyoffice.uwaterloo.ca /hspm/lasermanual/documents/section5.html   (677 words)

 Untitled Document
Laser supervisors will be knowledgeable of education and training requirements for laser safety, the potential laser hazards and associated control measures for all lasers under the supervisor's authority.
Laser radiation may damage the cornea, lens or retina depending on the wavelength, intensity of the radiation and the absorption characteristics of different eye tissues.
Lasers emitting radiation in the visible and infrared regions produce effects that vary from a mild reddening to blisters and charring.
www.ehs.usu.edu /Laser/LaserMan.htm   (4938 words)

 United States Patent Application: 0020126715
In some such embodiments, a rare earth doped garnet laser is tuned to emit a second fundamental beam at a wavelength of approximately 1077 nanometers, the second fundamental beam and the fourth harmonic beam are directed to a second cesium lithium borate crystal for sum-frequency mixing to produce an output beam at approximately 194 nanometers.
In one embodiment of laser 105, mirror 245 is approximately 75 millimeters from mirror 240.
Second laser 901 emits second beam 917 at a second frequency and second beam 917 is transmitted by mirror 920 to CLBO crystal 930, wherein first beam 907 and second beam 917 are mixed to produce output beam 935 at a desired frequency.
appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1='20020126715'.PGNR.&OS=DN/20020126715&RS=   (4254 words)

 Thinklasers.com   (Site not responding. Last check: 2007-11-06)
His laser was only able to emit pulsed operation due to the three different energy level transitioning utlized to construct the laser.
A laser is composed of a crystal (active laser medium) and a system of mirrors (optical resonator).
A coherent beam of light is produced between the reflective surfaces of the laser so that each photon passes through the uniform medium many times before being expelled through the lasers aperture, or lost to absorbtion and diffraction.
www.thinklasers.com /LIBRARY_LASERS.htm   (841 words)

 PhysicsWeb - Physics World Magazine - Lasers, chaos, and bow-ties
They relied on dilute active media with discrete energy levels such as gases or dopant ions scattered in a solid, external pumping mechanisms such as bulky coiled flashlamps or auxiliary gases excited by radio-frequency coils, and cumbersome external resonators consisting of highly flat and reflective mirrors.
The active medium which consisted of a semiconductor pn junction, was in this case a dense three-dimensional solid.
It is not an exaggeration to view the invention of the semiconductor injection laser as the start of a new era of quantum electronics ­ one that was ultimately to broker a fair partnership between photonics and electronics.
www.bu.edu /qil/pdf/PW-9-98.html   (1241 words)

 Active medium - Fraunhofer ILT
Laser light is generated in the active medium of the laser.
Energy is pumped into the active medium in an appropriate form and is partially transformed into radiation energy.
Solid state and liquid lasers can onlybe pumped optically; radiation from an ordinary lamp or another laser is absorbed by the active medium and the energy is re-emitted at longer wavelengths.
www.ilt.fhg.de /default.php?web=1&id=100049&lan=eng&dat=2   (520 words)

 Lasers, chaos, and bow-ties (September 1998) - Physics World - PhysicsWeb
The active medium, which consisted of a semiconductor p-n junction, was in this case a dense three-dimensional solid.
The very dimensionality of the active medium was reduced; two dimensions gave birth to the quantum-well laser, while a single dimension yielded the quantum-wire laser.
Although the effect was demonstrated using a quantum-cascade active medium, it should also be observed in other laser media with sufficiently high refractive indices.
physicsweb.org /articles/world/11/9/3/1   (1321 words)

 Laser Systems,Laser Print Machine,Laser Systems Exporter,Laser Printer Supplier,Laser Machine Exporter,Laser Systems ...
Laser is for example used for porcessing material (marking, cutting, welding, drilling measurement technology (Holography, speed measurement) or also in medical areas operations).
Each time radiation passes through the laser active medium, further “light particles” are emitted (stipulated emission) and the beam is amplified (light amplification).
The laser active medium is present in the form of gas.
www.spinksindia.com /how-to-choose-lasers.html   (489 words)

 Rami Arieli: "The Laser Adventure"
The active medium is an "Excited Dimer" which does not have a stable ground state.
A laser device is an optical cavity, with mirrors at the ends, filled with material such as crystal, glass, liquid, gas or dye.
A solid state laser which use a crystal of sapphire (aluminum oxide) containing trace amounts of chromium oxide as an active medium.
web.phys.ksu.edu /vqm/laserweb/Glossary/Glossary.htm   (1978 words)

 Lecture 9 – Laser Basics   (Site not responding. Last check: 2007-11-06)
Laser medium  - can be a gas, liquid, glass, crystalline solid or semiconductor crystal and can range in size from a grain of salt to filling the inside of a building.
Laser Gain  is proportional to the difference between the chance of stimulated emission and the chance of absorption.
Liquid lasers – tunable dye lasersactive medium in dye lasers is a fluorescent organic dye, dissolved in a liquid solvent.
www.chm.colostate.edu /erf/teaching/c532/lasers.htm   (5459 words)

 Gas laser and its applications
Argon Laser: The argon ion laser can be operated as a continuous gas laser at about 25 different wavelengths in the visible between 408.9 and 686.1nm, but is best known for its most efficient transitions in the green at 488 nm and 514.5 nm.
The molecular nitrogen laser is self-terminating, upon discharge the nitrogen enters the upper lasing energy level then decays to a lower state emitting light at 337.1 nm in the UV.
principle of gas laser: basically a gas laser consists of a gas whose atoms or molecules are raised to a higher energy states, and an "inversion" extis between a certain pair of energy levels in the gas.
www.acsu.buffalo.edu /~yuchang   (2864 words)

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