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Topic: Gas lasers


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In the News (Fri 19 Jul 19)

  
  Gas Lasers - Introduction
The word "laser" is an acronym for Light Amplification by Stimulated Emission of Radiation.
The primary wavelengths of laser radiation for current military and commercial applications include the ultraviolet, visible, and infrared regions of the spectrum.
Ultraviolet radiation for lasers consists of wavelengths between 180 and 400 nm.
www.aboutlasers.net   (436 words)

  
 How gas-ion lasers work
Argon lasers are normally rated by the power level produced by the six simultaneously lasing wavelengths from 514.5 nm to 457.9 nm.
This is accomplished in an ion laser by installing an etalon, such as the Lexel Model 503 Etalon, in the laser cavity as shown in the figure above.
The windows of the laser plasma tube through which the laser light must pass are aligned at Brewster's angle to eliminate the high reflective losses from the surfaces of the windows.
www.lexellaser.com /techinfo_gas-ion.htm   (1503 words)

  
 World Almanac for Kids
The laser medium of a gas laser can be a pure gas, a mixture of gases, or even metal vapor, and is usually contained in a cylindrical glass or quartz tube.
Lasers using electrons unattached to atoms and pumped to lasing capacity by an array of magnets were first developed in 1977 and are now becoming important research instruments.
Lasers have been used, for example, to drill holes in diamonds, to shape machine tools, to trim microelectronics, to heat-treat semiconductor chips, to cut fashion patterns, to synthesize new material, and to attempt to induce controlled nuclear fusion.
www.worldalmanacforkids.com /explore/space/laser.html   (1325 words)

  
 [No title]
The tunable dye laser is the laser which we will be building and using falls under the category of liquid-state lasers because the lasing medium which creates the beam is a liquid.
The gas laser is a laser in which the lasing medium is in the gaseous state.
The Helium-Neon laser is a little different from single dye and single gas lasers in that there are two gases, as the lasing medium, which causes the laser to operate.
earthops.org /lasers/olasers.htm   (1275 words)

  
 CO2 Lasers are now commonly used for the cutting and welding of many materials including metals, ceramics and plastics. ...
Inside the CO2 laser the beam is produced by the excitation of a laser gas inside a glass cavity.
High purity gases are required for the lasing gas as the laser is sensitive to gas borne impurities.
The laser gas mixture can be supplied either from a single cylinder of pre-mixed gas or from three cylinders which are mixed at the machine as required.
www.c-f-c.com /gaslink/laser/CO2lzr.htm   (613 words)

  
 Lasers   (Site not responding. Last check: 2007-09-18)
The specific components of a laser vary depending on the gain medium and whether the laser is operated continuously (cw) or pulsed.
The high energies of pulsed Nd :YAG lasers allow efficient frequency doubling (532 nm), tripling (355 nm), or quadrupling (266 nm), and the 532 nm and 355 nm beams are commonly used to pump tunable dye lasers.
Semiconductor lasers are light-emitting diodes within a resonator cavity that is formed either on the surfaces of the diode or externally.
elchem.kaist.ac.kr /vt/chem-ed/optics/sources/lasers.htm   (419 words)

  
 Gas Laser - Invented by Ali Javan
Hundreds of gas lasers have been made to operate at thousands of different colors in the spectrum, both in the visible (red, green and blue), and at near ultraviolet and infrared.
The light outputs from a variety of gas lasers is being used as the light sources for "optically pumped" lasers.
In April 1995 at the International Laser Conference in Baltimore on the occasion of the 35th Anniversary of the First Gas Laser, I was invited to speak about the early history of the field.
www.farhangsara.com /laser.htm   (2313 words)

  
 Gas lasers
Gas lasers can be classified in terms of the type of transitions that lead to their operation: atomic or molecular.
This gas laser is a four-level laser that use helium atoms to excite neon atoms.
In most He-Ne lasers the gas, a mixture of 5 parts helium to 1 part neon, is contained in a sealed glass tube with a narrow (2 to 3 mm diameter) bore that is connected to a larger size tube called a ballast, as shown above.
www1.union.edu /~newmanj/lasers/LaserTypes/GasLasers.htm   (2974 words)

  
 Howstuffworks "How Lasers Work"
A ruby laser (depicted earlier) is a solid-state laser and emits at a wavelength of 694 nm.
The reason that the CO laser is so dangerous is because it emits laser light in the infrared and microwave region of the spectrum.
Lasers are utilized in industry and research to do many things, including using intense laser light to excite other molecules to observe what happens to them.
www.howstuffworks.com /laser.htm/printable   (1893 words)

  
 Gas Lasers
The helium gas in the laser tube provides the pumping medium to attain the necessary population inversion for laser action.
Operating in a manner similar to the helium-neon laser, it employs an electric discharge for pumping, using a percentage of nitrogen gas as a pumping gas.
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.
hyperphysics.phy-astr.gsu.edu /hbase/optmod/lasgas.html   (397 words)

  
 Laser - Wikipedia, the free encyclopedia
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.
Argon-ion lasers emit 458 nm, 488 nm or 514.5 nm.
en.wikipedia.org /wiki/Lasers   (4585 words)

  
 GSI Group Laser Division - Laser Solutions for Industry.
The JK Laser line has never deviated from its original design philosophy; To bring speed, accuracy and precision of laser processing to the robust environment of the modern industrial world.
Spectron Lasers was established in 1982 to provide solid-state lasers for laser marking, laser cutting and laser welding applications within the medical and industrial OEM marketplace.
Lumonics Lasers is a well-established family of CO2 and (Excimer) pulsed gas lasers, focused on highly specialised industrial applications and materials processing such as high-speed ablation, ablative laser drilling, laser machining of plastics, polymers, ceramics and other non-metals, as well as laser marking and laser scribing.
www.gsiglasers.com   (408 words)

  
 List of laser types - Wikipedia, the free encyclopedia
Nd:Glass lasers are usually frequency tripled to the third harmonic at 351 nm in laser fusion devices.
This material is often used in highly-tunable mode-locked infrared lasers to produce ultrashort pulses and in amplifier lasers to produce ultrashort and ultra-intense pulses.
First demonstration of efficient "saturated" operation of a sub–10 nm X-ray laser, possible applications in high resolution microscopy and holography, operation is close to the "water window" at 2.2 to 4.4 nm where observation of DNA structure and the action of viruses and drugs on cells can be examined.
en.wikipedia.org /wiki/List_of_lasers   (908 words)

  
 Cryogenic gas purifiers for excimer lasers from Oxford Lasers   (Site not responding. Last check: 2007-09-18)
Laser performance in today's industrial and scientific environment must achieve higher and higher standards of beam quality and power stability.
This is particularly true in the case of lasers operating at 193 and 157 nm and those with line-narrowed output.
Even in the latest commercial excimer lasers, the reactions of the highly reactive halogen component produces molecular species in the gas mixture which progressively degrade beam quality and output power by blocking the effectiveness of the pre-ionizing radiation.
www.oxfordlasers.com /gm/gmh.htm   (404 words)

  
 Lasers-Science Tracer Bullet-Library of Congress
When an atom of the laser medium is excited, it temporarily occupies a higher energy level, and then subsequently falls to a lower energy state.
Laser light is emitted in a directional beam, and can be produced from the x-ray through to the ultraviolet, visible, and infrared radiation parts of the spectrum.
Laser applications include materials working (i.e., cutting, welding, drilling, and otherwise modifying industrial materials, including both metals and nonmetals), communications and information processing, medicine, measurement and inspection, data capture, surveying, marking, and alignment, printing and graphics, laser weaponry, isotope enrichment, holography, inertial confinement fusion, spectroscopy and atomic physics, and plasma diagnostics.
www.loc.gov /rr/scitech/tracer-bullets/laserstb.html   (1281 words)

  
 Stuffo "How Lasers Work"   (Site not responding. Last check: 2007-09-18)
Gas lasers (helium and helium-neon, HeNe, are the most common gas lasers) have a primary output of visible red light.
lasers emit energy in the far-infrared, and are used for cutting hard materials.
Excimer lasers (the name is derived from the terms excited and dimers) use reactive gases, such as chlorine and fluorine, mixed with inert gases such as argon, krypton or xenon.
www.stuffo.com /laser7.htm   (200 words)

  
 Sam's Laser FAQ - Carbon Dioxide Lasers
CO2 lasers are gas lasers that use carbon dioxide as the lasing medium.
Optimum gas pressure varies as 1/D. Optimum current density varies as 1/D and thus the total current varies as D. Discharge voltage per unit length then varies as 1/D. Power input and laser output per unit length are then independent of D (ignoring waveguide losses, in the case of waveguide lasers).
Since CO2 lasers operate at a wavelength 10 times longer than most other common lasers, there are a variety of materials used in their fabrication including some that would be affected or even dissolved in water or other common solvents normally used for the cleaning of hard coated glass optics.
repairfaq.ece.drexel.edu /sam/laserco2.htm   (21659 words)

  
 Sam's Laser FAQ - Vacuum Technology for Home-Built Gas Lasers
All but one of the gas lasers described in the chapters on specific home-built lasers require a decent vacuum system to remove air from the laser tube so that it can be back-filled with the required lasing gases at a low pressure.
Control the pressure of the gas fill as individual gases or gas mixtures are admitted to the apparatus either prior to or during operation as the electrical discharge buries gas molecules under sputtered electrode material or chemical reactions affect the proportion of each type of gas.
However, the gas ballasting usually increases the base (lowest) pressure attainable by up to a factor of 10 or more depending on design so where there is an option (usually an adjustable valve), it should only be used near the beginning of a pump-down cycle and then disabled (closed).
repairfaq.ece.drexel.edu /sam/lasercva.htm   (21391 words)

  
 JobShop.com Technical Article - Excimer Lasers...Unique Manufacturing Tools   (Site not responding. Last check: 2007-09-18)
The gas mixture consists of a buffer gas, used to carry away excess energy; a rare gas; and a halide gas.
Although excimer lasers were becoming more accepted and reliable, operating costs were still too high, and gas lifetimes were still too short for more than a few well-suited and high value added applications.
Gas lifetimes now are measured in days/weeks and tens of millions of shots and component lifetimes are surpassing several billion shots.
www.jobshop.com /techinfo/papers/excimerlaser.shtml   (1510 words)

  
 Current and reliable Gas Lasers news stories
Laser source, CNC, and servomotors are integrated and interfaced as complete system.
Laser communicates with CNC via optical bus, and all laser control and diagnostics are integrated into CNC.
Laser is designed for drilling and micromachining applications including PCB microvia drilling, flex circuit machining and plastics processing.
news.thomasnet.com /news/1883   (1006 words)

  
 Melles Griot Lasers Product Information   (Site not responding. Last check: 2007-09-18)
These lasers are available with output in the blue, green, and yellow spectral regions with output power as high as 3 W. Helium Cadmium (HeCd): Helium cadmium (HeCd) lasers operate in the deep blue (violet) or ultraviolet spectral region.
Diode Laser Assemblies and Drivers: Semiconductor diode laser assemblies are used extensively in OEM applications.
Handheld Laser Pointers: Laser pointers are available with red or green output and power up to 4 mW.
lasers.mellesgriot.com   (416 words)

  
 Reality and lasers | Gas Powered Garage
I want varied cool-looking weapons effect, starwarsy laser that travel slower than planes, instant laser beam with special flare effects at both end, and, personnaly, I'm longing for a RTS with giant colourful shots like there is in shoot-them-up.
And yes, I agree that invisible lasers ought to have been a good choice for some adwanced weapon (gameplay-wise it's inappropriate to use invisible wepons from the start).
Invisible lasers would be just one additional aspect that could be used on a grand scale.
garage.gaspowered.com /?q=node/378   (1654 words)

  
 Need Refurbished Gas Lasers/PSUs? Focus on Our Selection at HHR
HHR Lasers, Inc. will buy your used, damaged or inoperable lasers, psus and accessories, so we can process them into some of the best refurbished lasers in the industry.
All laser platforms are upgraded from “A” to “B” models, or the latest models when possible.
New laser tubes (manufactured on-site or procured off-site) are guaranteed for 12 months pro rata.
www.hhr-lasers.com /inventory.php   (706 words)

  
 Laser History - Gasdynamic
In equilibrium, statistical thermodynamics tells us that the upper levels have an exponentially decreasing population as a function of increasing energy, which means that the lower quantum levels have a larger population than the upper levels, thus a photon is more likely to cause an absorption.
Some of these lasers are so powerful that beams emerging from the chamber could potentially destroy the optics.
For a time the gasdynamic laser was seriously considered for use in the space based Strategic Defence Initiative (SDI) or Star Wars program.
laserstars.org /history/gasdynamic.html   (1291 words)

  
 [No title]   (Site not responding. Last check: 2007-09-18)
Laser HeNe stabilisé en fréquence et en intensité
Lasers à Azote Spectra-Physics Laser à Azote VSL-337ND-S
2060 is a small frame ion laser designed for 208V, 3-phase operation and will be individually configured and specified for each customer.
www.gratinglab.com /Lasers/Gas/2/5239/product.aspx   (233 words)

  
 Overheating * weapons/lasers/plasma | Gas Powered Garage
How about the possibility, that some high energy weapons, like heavy lasers, plasma cannons, or other heat producing weaponaary, could fire a lot for a short time, but causing it too overheat.
Also could this overheating be possible with the possible anti-nuke laser defense system.
Those high energy consuming lasers and plasma weapons must produce high quantities of heat.
garage.gaspowered.com /?q=node/547   (820 words)

  
 Lasers and laser optics : Atomic gas lasers
Three-longitudinal-mode He-Ne laser frequency stabilized at 633 nm by thermal phase locking of the secondary beat frequency
Thermal dephasing in second-harmonic generation of an amplified copper-vapor laser beam in beta barium borate
Experimental study on an all gas-phase iodine laser using microwave discharge of Cl /He as a Cl atoms source
www.opticsinfobase.org /ocisdirectory/140_1340.cfm   (354 words)

  
 Diode Lasers, Gas Lasers and Laser diode modules from LG Laser Technologies
Diode Lasers, Gas Lasers and Laser diode modules from LG Laser Technologies
Koheras offer an extensive range of solid state lasers for many applications and demands.
We supply a range of complete systems complying to EN 60825-1, as well as OEM components, which are designed for the installation in complete systems for applications, such as measurement technology, printing industry, medicine and biotechnology, as well as entertainment.
www.edinst.com /lg.htm   (203 words)

  
 Lasers and Electro-Optics
This textbook provides a detailed introduction to the basic physics and engineering aspects of lasers, as the design and operational principles of a wide range of optical systems and electro-optic devices.
Throughout, full details of important derivations and reults are given, as are many practical examples of the design, construction and performance characteristics of different types of lasers and electro-optic devices.
The first half of the book deals with the fundamentals of laser physics, the characteristics of laser radiation, and discusses individual types of laser, including optically pumped insulating crystal lasers, atomic gas lasers, molecular gas lasers and semiconductor lasers.
www.ee.umd.edu /LaserLab/book.html   (1029 words)

  
 JDSU Commercial Lasers - Solid-state, Fiber, Diode and Gas Lasers
JDSU designs, manufactures, and distributes commercial/non-telecommunications laser components and subsystems for a broad range of OEM applications in biotechnology instrumentation, graphics and imaging, semiconductor, materials processing, remote sensing, and biohazard detection.
Product technologies include continuous wave and passively Q-switched diode-pumped solid-state lasers, fiber lasers, marking systems, helium-neon and argon-ion gas lasers, and industrial diode lasers.
Compact, 488nm CW laser offering low heat load and high reliability based on ground-breaking telecom-style packaging.
www.jdsu.com /index.cfm?pagepath=Products/Commercial_Lasers&id=1838   (131 words)

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