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Topic: HeNe


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  Helium-neon laser - Wikipedia, the free encyclopedia
HeNe lasers have many industrial and scientific uses, and are often used in laboratory demonstrations of optics.
HeNe lasers are typically small, with cavity lengths of around 15 cm up to 0.5 m, and optical output powers ranging from 1 mW to 100 mW.
The HeNe laser was the first gas laser to be invented, by Ali Javan, William Bennet Jr.
en.wikipedia.org /wiki/Helium-neon_laser   (842 words)

  
 The Helium-Neon Laser
To understand the significance of a population inversion to HeNe laser action, it is useful to consider the processes leading to excitation of He and Ne atoms in the discharge, using the simplified diagram of atomic He and Ne energy levels given in Fig.
The small diameter, narrow bandwidth, and strong polarization of the HeNe laser beam are determined by the properties of the resonator mirrors and other optical components that lie along the axis of the optical resonator.
With the HeNe plasma tube in place, it should be possible to see a spot at the center of the high reflector mirror that brightens and dims at approximately the same rate as the diverging and converging circular interference rings observed earlier.
cat.middlebury.edu /~PHManual/heliumneon.html   (2196 words)

  
 Integration of a HeNe 543 nm green laser in the LSR II
HeNe 543 nm lasers (sometimes termed "GreNe" lasers) have been occasionally are sometimes installed on both both small benchtop instruments and large sorters with quartz cuvettes; the Beckman Coulter Altra can be equipped with small HeNe 543 nm lasers.
Sensitivity with the HeNe 543 nm excitation on the cuvette instrument was found to be superior to higher-power Kr green excitation on the stream-in-air instrument.
DsRed detection with the HeNe 543 nm laser on the LSR II or the Kr 530 nm laser on the FACSVantage DiVa.
home.ncifcrf.gov /ccr/flowcore/GreNe.htm   (1306 words)

  
 Lasers: Safety, Diode Lasers, HeNe Lasers, Drive, Info, Parts
HeNe lasers used to be found in all kinds of equipment including early laser printers, laserdisc players, small laser shows, optical surveying and tunnel boring systems, medical positioning systems, and supermarket checkout UPC and other barcode scanners.
For a HeNe laser, the distribution of the selected neon spectral line and shape of the reflectivity function of the mirrors with respect to wavelength determine which values of n are present.
The HeNe tube was mounted on standoffs using a pair of nylon cable clamps and aimed through a hole drilled in the plastic case.
www.iks-jena.de /mitarb/lutz/verein/funknetz/1/lasersam.html   (20825 words)

  
 Sam's Laser FAQ - Helium-Neon Lasers
And, in principle, it is possible to force a HeNe laser with at least one external mirror to "cavity dump" a high power pulse (perhaps 100 times the CW power) a couple of nanoseconds long by diverting the internal beam path with an ultra high speed acousto-optic deflector.
For a HeNe laser, the distribution of the selected neon spectral line and shape of the reflectivity function of the mirrors with respect to wavelength determine which values of n are present and the effective gain of each one.
While the operation of such a HeNe laser is basically the same as the one in a barcode scanner (and in fact may use the identical model HeNe laser tube!), several additional enhancements are needed to eliminate mode sweep and select a single output frequency.
www.repairfaq.org /sam/laserhen.htm   (20972 words)

  
 Sam's Laser FAQ - Home-Built Helium-Neon (HeNe) Laser
HeNe lasers only produce an output beam over about a range of current of 2:1 or 3:1 and the portion of this range where output is optimal (with minimal detectable change in intensity) may be much smaller.
HeNe Laser), had a maximum power on the order of 1 mW under optimal conditions based on their measurement of power using a silicon photodiode.
Although such HeNe tubes are manufactured for use in research lasers, I suspect this was a one-of-a-kind for another reason: In Magic Marker on the side is printed: He, Ne which I assume refers to the isotope of helium and neon used in the gas fill and the gas fill pressure (2.8 Torr).
repairfaq.cis.upenn.edu /sam/laserchn.htm   (21343 words)

  
 HeNe Lasers
The most economical gas lasers available, HeNe lasers are the first and most practical choice for the first-time laser user.
At this time all the HeNe lasers we have available are of this type.
A Helium Neon LASER TUBE is a glass, low-pressure gas-filled (Helium and Neon Mix) cylinder with a pair of frequency-specific mirrors at the ends.
www.mwklasers.com /henelasers.htm   (322 words)

  
 Sam's Laser FAQ - HeNe Laser Power Supply Design
On some internal mirror HeNe tubes or laser heads, you may find a wire or conductive strip running from the anode or ballast resistor down to a loop around the tube in the vicinity of the cathode.
While the current required to start a HeNe tube is negligible, the energy needed to achieve sufficient voltage given the stray capacitance of the wiring, HeNe tube anode, and other connected components is not.
The guts from these may be pressed into service as HeNe starters (a much more noble cause than their original application, I might add!) with the addition of a couple of HV diodes.
www.repairfaq.org /sam/laserhpd.htm   (20100 words)

  
 Sam's Laser FAQ - Complete HeNe Laser Power Supply Schematics
See the section: HeNe Laser Power Supply Selection Guide to identify the one (or more!) that may be most suitable for your collection of HeNe tubes as-is or with minor modifications.
With a small HeNe tube requiring about 1,200 V at 4 mA and additional 33K 5 W ballast resistor, it was possible to adjust/modulate the current between about 2 and 6 mA.
The booster still works without the additional diode and capacitor but won't be quite as effective at generating enough voltage for a particularly hard-to-start (or hard-to-restart) tube and the AC component of the multiplier may tend to cause the tube to drop out at a slightly lower line voltage than possible with well filtered DC.
repairfaq.cis.upenn.edu /sam/laserhsc.htm   (13434 words)

  
 Melles Griot Lasers Product Information   (Site not responding. Last check: 2007-10-08)
Currently, there are millions of HeNe lasers in the field, and only the semiconductor diode laser is produced in greater volume.
The key to the HeNe's success has been its low cost, small size, long operating life (as much as 50,000 operating hours), and unsurpassed beam quality.
HeNe lasers produce milliwatts of output power and are available in a variety of wavelengths ranging from 543 nm (green) to 3.39 ยตm (infrared).
lasers.mellesgriot.com /aagHeNe.asp   (188 words)

  
 CD Baby: HENE C: Da ProduC
Hene C is a liquid you can only drink with your ears and Da ProduC is the container it comes in.
Hene C: Musician and actor believes his music is his books.
Hene C he loves money and he loves helping as long as you understand he needs both.
cdbaby.com /cd/henec3   (161 words)

  
 [No title]
At the time this paper was written, (the early 1980's), building a large HeNe laser tube was still more economically feasible as compared to purchasing a laser of this size.
These days with the large surplus market of HeNe tubes, building a HeNe laser certainly is not a positive economic undertaking, but may provide a unique educational experience and a lesson in perseverance.
After this period of time, surplus prices of HeNe laser tubes dropped to a point were it was more practical to buy a ready-made unit.
www.jklasers.com /HeNe/HeNe_Laser_Report.htm   (2585 words)

  
 AC & DC HeNe Power Supplies
Our standard line of HeNe laser power supplies includes our more basic AC and DC input models.
Industry standard DC input power supplies for HeNe lasers up to 15mW.
L28 series DC Industry standard DC input power supplies for HeNe lasers up to 15mW.
www.powertechnology.com /hene_standard.asp   (84 words)

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