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Hello from Atlanta

rjcuomo1

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Good evening,

My name is Rick and I'm from Atlanta, GA. I have limited use in lasers (some engraving and basic pointers) and I need a little help and guidance for use in a cosplay prop. I'm looking for the best balance between visibility and safety as no one would be wearing PPE, so something low powered. I'm looking to use 2 blue or purple lasers in a prop. The place it would be use would be well lit, indoor setting. A nm recommendation would be helpful as well considering the attachment.

An example I was looking at is something similar to the 304 laser pointer Sanwu with a pattern cap in place. (I can't post links to it)

But isn't 100mW enough to hurt eyes? Would running it through a pattern cap "knock down" ( for a lack of a better description) the power as it would defuse through it?

This baby is the prop I want to build:
 

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paul1598419

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Welcome to the LPF. In a well lit environment you won't see the beam of a 5 mW laser of any wavelength. It would be best if you could have your beams out of the way of anyone so could could use higher power lasers. Greens are the most visible mW for mW. A 1 watt 520nm would make the beam visible even in well lit conditions. Good luck.
 

RedCowboy

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Good evening,

My name is Rick and I'm from Atlanta, GA. I have limited use in lasers (some engraving and basic pointers) and I need a little help and guidance for use in a cosplay prop. I'm looking for the best balance between visibility and safety as no one would be wearing PPE, so something low powered. I'm looking to use 2 blue or purple lasers in a prop. The place it would be use would be well lit, indoor setting. A nm recommendation would be helpful as well considering the attachment.

An example I was looking at is something similar to the 304 laser pointer Sanwu with a pattern cap in place. (I can't post links to it)

But isn't 100mW enough to hurt eyes? Would running it through a pattern cap "knock down" ( for a lack of a better description) the power as it would defuse through it?

This baby is the prop I want to build:

Any laser over 5mw can cause serious eye damage.

Also I find your image of a baby shooting laser beams from it's eyes quite dubious......however if you're actually thinking of building something like this, all I can say is NO! ...........Actually HELL NO! ............Lasers into and/or out of eyes is a big NO!
 

rjcuomo1

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Welcome to the LPF. In a well lit environment you won't see the beam of a 5 mW laser of any wavelength. It would be best if you could have your beams out of the way of anyone so could could use higher power lasers. Greens are the most visible mW for mW. A 1 watt 520nm would make the beam visible even in well lit conditions. Good luck.
I'm not trying to have the laser beams themselves being visible. I have regular blue LEDs to make that part of the effect. I'm trying to get the laser to make the effect like one of those christmas laser projectors (see attachment) have and the dots/stars/patterns be visible but don't want to be overpowered and dangerous. I did some reading on other sites saying that when you put higher power beams through those pattern caps, the beams when broken up, end up under 5mW.

Hope that clears up what I'm trying to accomplish
 

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RedCowboy

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The spinning diffraction gratings will produce many beams, however the more centered beams are often stronger than the rest, I can't guarantee you what will or won't be safe, maybe someone else can give you a basic formula, but any laser device you will be using around people who are not wearing the proper laser safety glasses is your responsibility and your responsibility alone to insure the safety of and know that it's not going to cause any harm or get you sued.

Also you should know the're laws regarding the display of a laser device in public, add to that the distraction hazards.

During the holidays I often catch one of those red/green Christmas lasers driving by someones house that's using the spinning diffraction gratings and when it hits my eye it's very distracting, someone could wreck a car or hurt someone.....really any device that shines laser beams into a wide area needs to be carefully thought out and tested.
 

Ears and Eggs

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During the holidays I often catch one of those red/green Christmas lasers driving by someones house that's using the spinning diffraction gratings and when it hits my eye it's very distracting, someone could wreck a car or hurt someone.....really any device that shines laser beams into a wide area needs to be carefully thought out and tested.

Not a fan of those laser Christmas displays. Have also got hit in the eye with those a few times. One idiot near my work didn't follow the instruction and had it aiming right into the street and not against their house. A few of the sub beams got me in the eye.


I would definitely recommend starting with a laser under 5mW even if you are going to put it through a diffraction grating as making sure each sub beam is under 5mW is not going to be easy as I don't think it's a linear drop off from the center.
 

rjcuomo1

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You guys think it may be worth it to buy a power meter and to some testing then?
 

paul1598419

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You guys think it may be worth it to buy a power meter and to some testing then?
I would, but I have three. There aren't as many for sale as there were several years ago. Good luck to you. ;)
 

RedCowboy

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These are reasonably affordable and accurate for general testing.


 

paul1598419

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Three lasers or power meters?]
Actually it was four, but my Laserbee died on me. I got the 3.7 watt Radiant after the Laserbee, then the Scientech, then the Hyperion as it can measure up to 20 watts.
 




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