Having Fun With Green Lasers
Friday, August 22nd, 2008Every good geek has played around with a laser pointer that has a red beam. You might have used one for work, to highlight and gesture when giving a PowerPoint talk. And to tease your cat or dog, make fun of your friends by planting a red dot in their forehead, and lots more fun things.
But, let’s face it! What’s the point of owning a red laser pointer when everyone not only can have one, but they actually do? Even your grandmother has one, and she doesn’t even “do” PowerPoint. So how do you rise to be top geek and impress your friends, furry or otherwise?
Now, take a look at the new green laser pointers. And I’m not talking about that other kind of “green” where everyone is recycling their old newspapers. I’m talking about a cool new laser pointer that uses the far more powerful 532 nm wavelength; which, as any geek worth “his or her salt” knows, is tons better than the old 650 nm wavelength used by the red laser point. And, best of all, all that extra wavelength means it’s really truly green.
Green goes further and shines brighter than red, meaning that it can highlight objects from a greater distance. Instead of just pointing the beam on your friend across the room or the PowerPoint slide behind you, you can now direct the green beam on clouds and constellations in the sky. It’s so powerful and bright that it’s even visible outside in the sunlight.
This equipment is so strong that it could actually get you arrested! Yes, arrested. Pointing a green laser beam at an aircraft could have the FBI on your case, wondering if you’re planning possible terrorist operations from your backyard. Pretty neat, huh? Your old dinky red pointer can’t do that.
And the green laser pointer doesn’t produce just a wee little spot. You can see the whole beam as it travels to the stars. Think Luke and his light saber. See the possibilities?
A green laser pointer is at a whole separate plane from the old-style red laser pointer. For a true green, a pointer needs a green direct injection laser diode. These diodes could be potentially dangerous if handled by the public at large, so they’re not even available wholesale. So this complicated process follows to keep hazardous material out of peoples’ hands. (And only the geeks in the room will understand a word of it.)
The green laser pointers, available on the market today, all use Diode Pumped Solid State Frequency Doubled technology, aka DPSSFD, which is good news for everyone. Basically, this means that an infrared laser diode pumps out 808 nm, which is then altered to 1,064 nm, which is then shot into a crystal that doubles the frequency to produce the green beam at 532 nm. (It should go without saying, because only card-carrying geeks are reading this, which with frequency smaller numbers mean stronger.)
For all these reasons, green laser pointers are the cool new technological gadget that all your techie friends will love. They were actually created in 2000, but outside highly technical fields they’re still virtually unknown. Be prepared to pay a heftier price, though. Red pointers cost less than $10, but a new green laser pointer can be as much as $50. But it will be worth every penny. How could you resist such a powerful new device? We know you want one.




