http://www.neonlightssigns.info/laser-pointer/
Laser Pointer
How far could the ray from my laser pointer travel?
At some clear and starry nites, I often point out the stars with my laser pointer. I wondered, how far does the ray travel? Does it ever reach the distance stars out there?
In the vacuum of space the light from your laser-pointer would, theoretically, travel forever -- except that outward pressure from the photons, from which the the light is composed, eventually disperse the laser's coherent-light beam.
Here on Earth, the energy in the beam is sapped, little by little, from collisions with the gas molecules in the air, as well as the dust particles and tiny water droplets suspended in it (remember that air is not invisible; it is merely transparent, and miles and miles of it add up, the same way that thin glass panes that seem to clear individually form a dark green opaque mass when stacked twenty thick), with all the energy scattered and absorbed.
Still, though your laser-pointer will not illuminate significantly beyond a range of 200-300 feet, its light is still intense enough to trigger the receptors in the retinas of observers a mile or two away. To them it will appear as just a tiny point of light.
PS: In the early 1960s NASA bounced a very powerful laser beam off the surface of the Moon, 238,000 miles away. The beam started out at the source less than a half-inch wide; by the time it struck the moon it was nearly a mile wide (and very faint) as a result of the pressure from the energetic photons (and some inevitable dispersal due to its passing through the Earth's atmosphere on the way to the Moon).
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Modify Your Laser Pointer
Buy High Quality laser pointers rather than "Cheap" laser pens
Many laser lovers complain about their defective laser pointer pens purchased online, but they're just out of luck or careless in getting them.
The never-loosing frowns at those "shoddy" lasers gradually ruins the name of all laser products. In order to help global laser lovers find the genuine laser that lasts for years and meanwhile do justice to the decent laser business, we're here to help you tell the "wrong" from the right.
We know it pays to be cutting edge, and to put aside the laser power or beam, one could tell if the laser is "bat out" or really refinedly made from the shell or casing.The shoddy laser pointers' shell are generally made out of low quality metal or even plastic. Like the Classics series 1 to 150MW green lasers at our site are all of pure aluminum, silver, or special metal hardened/anealled alloys. The special air cooling method has also been adopted. A high powered DPSS laser module usually generates a lot of heat that needs to be dissipated by the shell while the low-end shell will not able to release the heat as easily and the normal function of a laser will be deteriorated. The heat that builds up can even burn out the laser diode.
The laser beam of the green lasers is Always and only green because green light is the most visible color to the human eyes. However, shoddy green laser pointers do not just give out green light, they also give out infrared light. Infrared light cannot be seen by the human eye so the beam from these shoddy laser pointers is not as bright as it should be and is also most dangerous to the eyes. You can damage your eyes and not even be aware of it until to late. All the laser pointers from LaserPointerPen.Net guarantees the non-IR green laser beam, while the supporting of Infrared (IR) protection 1064nm laser goggles and Near Infrared (IR) 750-850nm protection laser goggles nearly provide a Double Insurance of the eye safety of the eyes. Moreover, we often provide these laser safety goggles for free, esp. for those over 200mw green laser clients.
Many laser retailers cheats their customers on wavelengths, and some confuse the commonplace 433nm blue laser pointer with the 473nm blue laser pointer pen. These years, the 532 nm green laser being the most commonly seen, in September 2005, handheld blue laser pointers at 473 nm have also become available. The portable blue laser pointer is not only related to blue laser, blue laser diode, blue laser sight, blue laser power and blue laser module, but also introduces the DPSS laser, laser optics, laser module, laser diode, diode laser, fiber laser, laser power, solid state laser, laser technology, yag laser, laser show, laser light show, laser marking, laser printer, semiconductor laser, eye laser, laser light, laser gun, laser welding, etc.
Some laser lovers are attracted to many shoddy lasers just because they use high powered rechargeable batteries, and that's why most "bulky" all-solid-state laser modules are often neglected. Actually, the high-end laser technology has little to do with the batteries though the power supply counts. On the other hand, even high powered batteries could not make a ultra bright beam as it should be if it happens to be a shoddy laser.
You may be asking why a shoddy laser pointer can have a power of 200mW but be less bright than a 50mW green laser from LaserPointerPen.Net. Here is the trick. As we just said, these laser pointers give out a lot of infrared light which you can't see making them less bright. Laser power meters however cannot distinguish between green light and infrared light. The 200mW power level of a shoddy laser pointer will normally be made up of mostly infrared light. For example a combination 25mW green (532nm) and 175mW infrared (808nm). A 50mW dragonlaser will be 50mW green with virtually no infrared.
So run to genuine lasers from now on and do the laser itself justice!
About the Author
Being cutting-edge pays. I never reget buying the 200mw green laser pointer from off 35% green laser pointer pen and the induction heating system widely used for induction brazing, induction forging, induction annealing and other heat treatmentinduction heating system
One Comment
I suppose you could tape your index finger to your middle finger until you break the habit…