How old it is!

Esteban · #1 10-27-2007, 05:18 PM

Maybe there are more old.

Esteban · #2 10-27-2007, 05:22 PM

Other. First constructional laser project?

Qiaozhi · #3 10-27-2007, 06:05 PM

Quote:

Originally Posted by Esteban

Other. First constructional laser project?

I prefer this one -> http://www.metacafe.com/w/756433

Esteban · #4 10-28-2007, 03:25 AM

Quote:

Originally Posted by Qiaozhi

I prefer this one -> http://www.metacafe.com/w/756433

Qiaozhi:

Sorry, can't access!!

Regards

Esteban

Qiaozhi · #5 10-28-2007, 01:06 PM

Quote:

Originally Posted by Esteban

Qiaozhi:

Sorry, can't access!!

Regards

Esteban

Seems to work ok for everyone else. Perhaps you need macromedia flash or something.

Esteban · #6 10-28-2007, 03:01 PM

Quote:

Originally Posted by Qiaozhi

Seems to work ok for everyone else. Perhaps you need macromedia flash or something.

Qiaozhi,

Thanks very much. In one of my computers I can't, but in the other yes.

Regards

Esteban

Elie · #7 10-28-2007, 03:57 AM

Quote:

Originally Posted by Qiaozhi

I prefer this one -> http://www.metacafe.com/w/756433

DO NOT LOOK AT LASER WITH REMAINING EYE!
Seriously, this project is very dangerous. The laser pointers which are produced commercially are low power (although one should still not "get the beam in ones eye"), but what this guy shows will burn ones eye instantly. Lasers which are used in DVD players, etc., are high power devices, NOT TOYS.

Elie · #8 10-28-2007, 04:07 AM

Esteban's source:
http://blog.modernmechanix.com/
Esteban is a bad boy!

Esteban · #9 10-28-2007, 02:59 PM

Quote:

Originally Posted by Elie

Esteban's source:
http://blog.modernmechanix.com/
Esteban is a bad boy!

Yes! You can subscribe to Modern Mechanix blog and receive every day on your email.

Max · #10 10-28-2007, 08:29 AM

Quote:

Originally Posted by Elie

DO NOT LOOK AT LASER WITH REMAINING EYE!
Seriously, this project is very dangerous. The laser pointers which are produced commercially are low power (although one should still not "get the beam in ones eye"), but what this guy shows will burn ones eye instantly. Lasers which are used in DVD players, etc., are high power devices, NOT TOYS.

Hi,
yes that's true... 250mW laser could burn one retina in few time... probably less than 0.1 seconds... the focus inside the eye will burn the most sensitive central area of retina in maybe half that time with such power.

Laser pointers (toys and stuff for conferences etc) are much smaller powered maximum 5mW so 50times less than this bad project...often they are under 1mW real power.

Watching at them could give damages too... but cause of small power it requires more time to make real damages to retina... that's a live tissue and could also partially regenerate a very small burnt.

SO FOR PEOPLE THAT WANT PLAY WITH THEM ANYWAY: BE REALLY CARE ON WHAT YOU DO...

The same apply for DIY or repair or mod of DVD/CD/burners/readers ... DO NOT PLAY WITH THEM IF YOU DON'T KNOW ABOUT POWER AND DAMAGES THAT LASERS CAN MAKE TO YOUR EYES.

My interest in the old article is just academic... cause I know about everything about how it works but wanna see e.g. strategy for growing the crystal and similar stuff with just homemade stuff... could be funny see that thing coming from the year 1964!

Kind regards,
Max

Elie · #11 11-01-2007, 05:09 AM

Quote:

Originally Posted by Max

Hi,
yes that's true... 250mW laser could burn one retina in few time... probably less than 0.1 seconds... the focus inside the eye will burn the most sensitive central area of retina in maybe half that time with such power.

Laser pointers (toys and stuff for conferences etc) are much smaller powered maximum 5mW so 50times less than this bad project...often they are under 1mW real power.

Watching at them could give damages too... but cause of small power it requires more time to make real damages to retina... that's a live tissue and could also partially regenerate a very small burnt.

Laser pointers are supposed to give you time to blink, before damaging your eye.
LASERS ARE NOT TOYS, AND YOU SHOULD NOT "PLAY" WITH ANY LASER, THIS APPLIES TO LOW POWER LASER POINTERS. IT IS POSSIBLE TO EXPERIMENT SAFELY WITH HIGHER POWER LASERS, BUT MAKING ONE INTO A LASER POINTER, AS THE GUY IN THE VIDEO DID, IS JUST PLAIN STUPID.

Qiaozhi · #12 10-28-2007, 01:08 PM

Quote:

Originally Posted by Elie

DO NOT LOOK AT LASER WITH REMAINING EYE!
Seriously, this project is very dangerous. The laser pointers which are produced commercially are low power (although one should still not "get the beam in ones eye"), but what this guy shows will burn ones eye instantly. Lasers which are used in DVD players, etc., are high power devices, NOT TOYS.

Of course - do not look into the laser. Anyway, I never said it was a safe project.