Greg Hewgill (ghewgill) wrote,
Greg Hewgill

green laser pointer fun

So I have a little bit of a weakness for certain kinds of random electronic gadgets. Right now it's laser pointers. I've been curious about the green ones ever since the news reports a few months ago about people accidentally illuminating the inside of airplane cockpits.

The other day I ordered a green one through ebay. This thing appears to be every bit as powerful as they claim! It's Class IIIa (normal for laser pointers), so it's supposed to have a 5 mW maximum output, but this thing is bright. It almost hurts to look at the spot on a white sheet of paper. In a dark room, you can see the beam in the air as it reflects off all the particulate matter in the air. Although it's the same power output as a normal red laser pointer, the human eye is much more sensitive to the green area of the spectrum, so it appears brighter.

There's one situation where this might actually be useful instead of just an amusement. If you're out stargazing with more people than just yourself, it's really hard to point out a certain star without resorting to directions like: "Okay, see that bright one there, and the slightly dimmer one down and to the right? Go down from there two more brightish ones and then look between that and the one over that way that has an orangeish tint." At night you can see the beam for at least hundreds of feet, so it's a great way to point at specific places in the sky.

There are mods you can make to this pointer to increase its power output, everything from simply changing a potentiometer accessible under the pushbutton, to opening it up and replacing the diode element. I don't have any particular need for more power, or desire to tear apart the pointer, so I'll keep it the way it is.

Anyway, it's sure a fun toy!
Tags: toys

  • purging and found treasures

    I'm doing a major purge for the first time in a really long time. The most recent purge was when I moved from Canada to California 13 years ago - I…

  • random musings

    I just caught up on four or five days of reading my LJ friends page. Seriously, where did I think I'd have enough time to keep up with all this…

  • cutting the crap

    Ok, I've started the first pass of the culling. I'm not going to post every little detail here, but this is just to give you an idea of the kind of…

  • Post a new comment


    Anonymous comments are disabled in this journal

    default userpic

    Your reply will be screened

    Your IP address will be recorded