Mw question.

[newbee]

What laswer power in Mw would be powerful enough to burn hair?

Also, Can you feel 50Mw on the skin? if it was to be shined direct on to it? ( painfull or just know its there?)

Also, What Mw would be painfull on bare skin?

Thanks.

 

[Luap]

It varies.. Roughly speaking you want 80mw thereabouts, or more of course to do any kind of burning.
You might feel 50mw on your skin, particularly with a darker complexion, but it isn't going to do anything nasty or hurt much, if it all. But could of course blind someone if you shone it in their eyes.
As for hair burning.. Thats a slightly weird question.. But most hair is quite glossy, so will reflect quite a bit of laser light energy. So I would think your chances of burning it are slim, even with quite a powerful laser pointer. IE even at 100mw+

Paul

 

[dr_lava]

are you trying to build a laser depilatory device? You could just try shaving

 

[liveforphysics]

If you must deal in Mw, 0.00001Mw should be more power than you will ever need for the purposes listed.

As far as burning hair goes, the smell alone is going to be enough to keep it from being used for purposes of good.

I get a strong vibe of useing lasers for vile purposes brewing, which are exactly the sort of actions that get more regulations placed on lasers.

thumbs down

 

[PhotonWrangler]

Laser hair removal units start around .5w and go up to 2w or thereabouts and operated in pulsed mode with less than 50% duty cycle. Efficacy depends a great deal upon the amount of pigment in the hair; the darker the better.

 

[newbee]

If you must deal in Mw, 0.00001Mw should be more power than you will ever need for the purposes listed.

As far as burning hair goes, the smell alone is going to be enough to keep it from being used for purposes of good.

I get a strong vibe of useing lasers for vile purposes brewing, which are exactly the sort of actions that get more regulations placed on lasers.

thumbs down

And what vile purposes would those be then?


I'm a school teacher and trying to find a laser that is not able to burn hair or feel on the skin. also i am tryin to find one that will.

 

[Madz]

That is a paradox.

 

[kdam36]

why is it a paradox??? you get a low powered laser that wont burn....... and i hig powered one that will.....its not rocket science?

 

[PhotonWrangler]

I'm a school teacher and trying to find a laser that is not able to burn hair or feel on the skin. also i am tryin to find one that will.

I gather this is for a physics lesson?

 

[Hemlock Mike]

I think the NdYAG laser I built 20 years ago has a whopping 0.75 Megawatt output.
It takes about 45 seconds to recharge the capacitor bank !!!!

Mike

 

[Bimmerboy]

I'm a school teacher and trying to find a laser that is not able to burn hair or feel on the skin. also i am tryin to find one that will.

Hmmm... The first sentence is missing two commas, the second is missing one. Neither the first letter in the second sentence, nor the word "I" are capitalized. Well, perhaps you're just not an English teacher.

Mind sharing what the laser hair burning lessons are about? Will all your students be wearing eye protection of the right wavelength? Is the skin burning for the students who aren't paying attention?

 

[Kiessling]

Like Bimmerboy I have doubt on the purpose of this thread and the original poster.
On this subject, doubts are enough to close the thread.
bernhard