Old 10-21-2016, 04:01 PM #1
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Default New and hungry

Hello

I always wanted to play with lasers and now my dream is coming true. So I will ask all the possible question about lasers that I can think of before I buy my first laser.

The first question will be about the danger of an unfocused 4W laser at around 5 meters distance


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Old 10-21-2016, 04:09 PM #2
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Default Re: New and hungry

Quote:
Originally Posted by dreamsfain View Post
Hello

I always wanted to play with lasers and now my dream is coming true. So I will ask all the possible question about lasers that I can think of before I buy my first laser.

The first question will be about the danger of an unfocused 4W laser at around 5 meters distance

Your question isn't specific enough - unfocused tells us nothing. 5 meters doesn't tell us much either. Direct exposure? Reflection? How much is it "unfocused", i.e. what's the beam diameter? What are you trying to achieve?
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Old 10-21-2016, 04:13 PM #3
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Default Re: New and hungry

Thank you for helping me to clarify my question, the diameter will be 20cm and direct exposure
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Old 10-21-2016, 04:22 PM #4
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Default Re: New and hungry

Quote:
Originally Posted by dreamsfain View Post
Thank you for helping me to clarify my question, the diameter will be 20cm and direct exposure

My response from your other thread:

Quote:
Originally Posted by diachi View Post
But yes, that is dangerous. If you need to ask then you're not in a position to do that sort of thing safely.
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Old 10-21-2016, 04:30 PM #5
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Default Re: New and hungry

Sounds to me that someone is trying to make a dazzler in which case. NO. Don't do it. Both of your threads mention a 4 watt laser unfocused and direct eye exposure.
4 watts as a first laser is also completely ridiculous no matter the person.
At those kinds of powers, you even have to worry about accidentally setting stuff like curtains on fire.
My old ~1.2 watt 445nm would char walls from a few feet away if sat down.
Imagine what that would do to a pair of eyes.
5mW's was determined to be the most power that could be safely used such that a person's blink reflex would save their eyes from permanent damage.
Yes their are ways to make the exposure safe but it any variable changes it can quickly become damaging. For instance if the focus changes or the distance changes or even if the power density calculations were done improperly or using incorrect measurements.
If you are wanting something bright but defocused, look into LED's. some of them still pack a serious punch but aren't coherent and don't as easily cause stuff like retinal burns from a distance although even those can cause damage under the wrong circumstances.
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Old 10-21-2016, 05:01 PM #6
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Default Re: New and hungry

Thank you for your answers, the room is 5 meters long and I wanted to know if that kind of power is dangerous even if its not focused, in case I would look at the laser by accident
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Old 10-21-2016, 05:06 PM #7
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Default Re: New and hungry

Quote:
Originally Posted by dreamsfain View Post
Thank you for your answers, the room is 5 meters long and I wanted to know if that kind of power is dangerous even if its not focused, in case I would look at the laser by accident

Anything >5mW is considered potentially dangerous for direct exposure.

And to qualify that, <5mW is also potentially dangerous, but your blink reflex will generally save you in the event of an accident.
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Old 10-21-2016, 10:38 PM #8
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Default Re: New and hungry

I will buy a IR 800nm laser so the blinking reflex won't help me in any way
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Old 10-21-2016, 10:41 PM #9
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Default Re: New and hungry

I am very curios to try to zap mosquitoes with the laser even if it isn't focused. Could the laser damage their wings at a distance?
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Old 10-21-2016, 10:51 PM #10
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Default Re: New and hungry

Quote:
Originally Posted by dreamsfain View Post
I will buy a IR 800nm laser so the blinking reflex won't help me in any way

That's even more dangerous, the blink reflex is a good thing.
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Old 10-22-2016, 12:11 AM #11
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Default Re: New and hungry

This guy seems like a troll diachi.

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Old 10-22-2016, 12:36 AM #12
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Default Re: New and hungry

Get yourself a good Host, like the one below, to put your 4w Blue laser in.
Then you can zap those pesky Mozzies safely.

See this thread: Hit in eye with 1000mw 445nm blue laser

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Old 10-22-2016, 08:05 PM #13
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Default Re: New and hungry

If the power would be dissipated equally over the surface then it would be 10mw per square cm
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Old 10-22-2016, 08:10 PM #14
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Default Re: New and hungry

The "Hit in eye with 1000mw 445nm blue laser" was 60cm from the laser so for a 4w laser it would be very dangerous at 2.4 meters for my eyes don't know how this will work on mosquitoes

Has any one build a bug zapper with lasers?
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Old 10-22-2016, 09:00 PM #15
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Default Re: New and hungry

Quote:
Originally Posted by dreamsfain View Post
The "Hit in eye with 1000mw 445nm blue laser" was 60cm from the laser so for a 4w laser it would be very dangerous at 2.4 meters for my eyes don't know how this will work on mosquitoes

Has any one build a bug zapper with lasers?
You should build a bug zapper with electricity or poison.
No other method is efficient. Lasers introduce risks to yourself and to others.
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Old 10-22-2016, 11:21 PM #16
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Default Re: New and hungry

Quote:
Originally Posted by RB astro View Post
Get yourself a good Host, like the one below, to put your 4w Blue laser in.

LOL I've got to make that some day. Maybe not soon, but it's going on the bucket list
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I'm selling some custom machined hosts. Click here to take a look!
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632.8nm: Melles Griot HeNe, 1mW
532nm: Custom made GITD Pocket laser: ~133mW
532nm: Chrome laser pen: ~50mW
532nm: Cheap eBay 303: ~60mW
465nm: 07E Laser Box Build: 4W
450nm: Stainless Steel NUBM44 Handheld: 6.8W
445nm Pocket Series from Podo (Sanwu): 500mW
405nm: eBay pen

Keep yourself safe. *link*
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