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Thread: How should I choose a burning laser?

  1. #1
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    Post How should I choose a burning laser?

    Hello, guys.
    I'm a rookie and understand the knowledge of the product is not much, now, i want to buy a cheap and true burning laser, I do not know how much the minimum power for green, blue or red laser to burn something, i want to buy a green burning laser, please give me some advice, thank you

  2. #2

    Default Re: How should I choose a burning laser?

    Please be extra careful, these things will burn your eye faster than you can blink. Don't have them in any household with kids around, they are too risky.
    Burning lasers will blind you just bouncing a reflection from a table top. You need to prepare for them like you would for any dangerous activity, get and wear proper gear, especially eye protection. High density welding goggles are a good thing unless you can afford frequency specific filters and lasers. ($$$)
    Burning lasers is a fuzzy term, even a modest size laser will pop a balloon or ignite a match, but they are not going to melt engines or cause siding to burst into flame.
    Military lasers that can do that are in the 100 kilowatt class and need an airplane to power them.
    Ordinary mortals can build/buy lasers in the 0-10 watt range and the laws require lasers to be labeled according to their power levels. Afaik, the US limit for lasers sold to consumers is under 10 milliwatt, but that surely has many loopholes and exceptions.
    I've been very pleased with a well priced (about $20) green laser pointer from Sanwu ( https://www.sanwulasers.org ), it runs on a standard 18650 rechargeable battery and is an effective pointer even in daylight. They offer more costly units, but I have no need of those.
    Note that this is merely a very high performance pointer, not a 'burning laser', although it certainly would pop a balloon. It still gives me enough concern that I always keep it locked and with the diffuser cap screwed on, because all it takes is one slip. These things are like loaded guns, waiting for the unwary.

  3. #3
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    Default Re: How should I choose a burning laser?

    Quote Originally Posted by etudiant View Post
    Please be extra careful, these things will burn your eye faster than you can blink.
    What would you guess is the minimum milliwatt needed to wound but not kill a house fly or mosquito? I don't want to kill the fly outright for fear of burning stuff in the background or potential eye damage (although with a strong laser, I'd also invest in eye protection).

  4. #4
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    Default Re: How should I choose a burning laser?

    Quote Originally Posted by kenneth_dart View Post
    What would you guess is the minimum milliwatt needed to wound but not kill a house fly or mosquito? I don't want to kill the fly outright for fear of burning stuff in the background or potential eye damage (although with a strong laser, I'd also invest in eye protection).
    I would not recommend using a laser for this, even with something lower power, it is too easy to get careless shining it around after an insect.

  5. #5

    Default Re: How should I choose a burning laser?

    Quote Originally Posted by kenneth_dart View Post
    What would you guess is the minimum milliwatt needed to wound but not kill a house fly or mosquito? I don't want to kill the fly outright for fear of burning stuff in the background or potential eye damage (although with a strong laser, I'd also invest in eye protection).
    Fly eyes are compound eyes, thousands of little units much like pixels in a camera sensor and even a very bright light won't blind them. Remember they have no eyelids, so they are adapted to seeing the sun directly all day long.
    So the task is really to burn them. That will take more than a 1 watt laser, which is instant retina burn for humans. Seeing the fly while wearing the needed welder goggles is difficult. Find a better method is my strong recommendation.

    The idea does work, I remember reading about a mosquito zapper that relied on laser pulses to fry the insects. I never saw the device, but presumably the beam only hit mosquitoes that flew into the trap, as the liability otherwise would be intolerable.

  6. #6
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    Default Re: How should I choose a burning laser?

    Quote Originally Posted by clearlove View Post
    Hello, guys.
    I'm a rookie and understand the knowledge of the product is not much, now, i want to buy a cheap and true burning laser, I do not know how much the minimum power for green, blue or red laser to burn something, i want to buy a green burning laser, please give me some advice, thank you
    While it's not the most humane method, I would only guess that it's no worse than being electrocuted to death . I advise you to learn more about lasers and laser safety before you make any purchases. For your application the only laser I could recommend is an SD 301 - SD 303 because they have to be unfocused to burn anything and if it's a mosquito biting your arm, you obviously don't want to burn it with a laser. Minimum burning range would be within 12 Inches. At that that would be like trying to shoot a fly with a 9mm pistol. Other than setting up some type of a cage using mirrors which could cost a lot more than what you were looking to spend...I can't give you any other advice.

  7. #7

    Default Re: How should I choose a burning laser?

    Quote Originally Posted by etudiant View Post
    SNIP.

    Seeing the fly while wearing the needed welder goggles is difficult.

    SNIP
    NO NO NO

    It is not safe to use a laser wearing welder's goggles; they offer no protection and only hinder your vision.

    You have to match the goggles to the wave length you want to cut; say for a 455nm laser you need goggles that cut out the 455nm wave length. Welder's goggles are simply an ND filter that decreases the amount of light reaching your eye; it does not cut any wave length.

    Since a laser beam has so many photons (read so much brightness) a pair of welder's goggles would have reduced the other wave lengths to total darkness in order to provide any protection; so you would be blinded by the goggles.

  8. #8
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    Default Re: How should I choose a burning laser?

    Quote Originally Posted by ragebot View Post
    NO NO NO

    It is not safe to use a laser wearing welder's goggles; they offer no protection and only hinder your vision.

    You have to match the goggles to the wave length you want to cut; say for a 455nm laser you need goggles that cut out the 455nm wave length. Welder's goggles are simply an ND filter that decreases the amount of light reaching your eye; it does not cut any wave length.

    Since a laser beam has so many photons (read so much brightness) a pair of welder's goggles would have reduced the other wave lengths to total darkness in order to provide any protection; so you would be blinded by the goggles.
    Thank you Ragebot! I was reading this thread and thinking the same thing. Welding eyewear is NOT a substitute for real laser protective safety glasses such as the Eagle Pair. Every time we have a solar eclipse you read a few horror stories of some poor sap permanently screwing up their vision by using arc welding glass to view the sun. Even a 5mW pointer is considerably brighter than the sun in terms of power/area.

  9. #9

    Default Re: How should I choose a burning laser?

    I thought you can only damage your eyes if you get the laser IN your eye, not just reflected... I mean reflected off a mirror of course but like off a wall?

    Example, looking at the dot on the wall will blind you?

  10. #10

    Default Re: How should I choose a burning laser?

    @addygofast It depends on the wall and laser power.
    Things are not as simple as they may seem.
    In a reflection damage there are many issues to consider:


    - power
    - beam diameter and divergence
    - color of laser
    - color of surface
    - absorption/reflexion rating of the reflecting surface


    You can safely look from any angle at a 1000mW blue laser burning the paint of a black rubber wall or wood, but 100mW of the same blue reflected of a high quality white polished paint into your eye will cause permanent eye damage.

  11. #11
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    Default Re: How should I choose a burning laser?

    What is the maximum burning laser power you can buy on the Internet?

  12. #12
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    Default How should I choose a burning laser

    I did some searching on the interwebs and I dont see very many options for the t4 s364.5, any sources you guys know of? Lots of t3 stuff out there.

  13. #13

    Default Re: How should I choose a burning laser?

    Quote Originally Posted by etudiant View Post
    I've been very pleased with a well priced (about $20) green laser pointer from Sanwu ( https://www.sanwulasers.org ), it runs on a standard 18650 rechargeable battery and is an effective pointer even in daylight. They offer more costly units, but I have no need of those.
    Note that this is merely a very high performance pointer, not a 'burning laser', although it certainly would pop a balloon. It still gives me enough concern that I always keep it locked and with the diffuser cap screwed on, because all it takes is one slip. These things are like loaded guns, waiting for the unwary.
    The Link goes to a variety of models. What model do you have?

  14. #14

    Default Re: How should I choose a burning laser?

    Just their basic green laser pointer, it is plenty imho. https://www.sanwulasers.com/product/304

  15. #15

    Default Re: How should I choose a burning laser?

    See above
    Last edited by etudiant; 01-19-2020 at 08:12 PM. Reason: corrected with quote

  16. #16

    Default Re: How should I choose a burning laser?

    Quote Originally Posted by ragebot View Post
    NO NO NO

    It is not safe to use a laser wearing welder's goggles; they offer no protection and only hinder your vision.

    You have to match the goggles to the wave length you want to cut; say for a 455nm laser you need goggles that cut out the 455nm wave length. Welder's goggles are simply an ND filter that decreases the amount of light reaching your eye; it does not cut any wave length.

    Since a laser beam has so many photons (read so much brightness) a pair of welder's goggles would have reduced the other wave lengths to total darkness in order to provide any protection; so you would be blinded by the goggles.
    You are of course totally correct and it was stupid of me to make that comment.
    Lasers are brutally dangerous and nobody should try to work with them unless properly equipped with the right goggles appropriate for the laser involved.
    Thank you for setting this straight and correcting me.

  17. #17

    Default Re: How should I choose a burning laser?

    Quote Originally Posted by etudiant View Post
    You are of course totally correct and it was stupid of me to make that comment.
    Lasers are brutally dangerous and nobody should try to work with them unless properly equipped with the right goggles appropriate for the laser involved.
    Thank you for setting this straight and correcting me.
    Good job etudiant! I'm pretty sure we all share bad info from time time... I know I have. But THAT was the best response to a correction I think I've ever witness in 15 or so years of reading forums!

  18. #18

    Default Re: How should I choose a burning laser?

    Man, having a mosquito-burning laser was our dream with my father back in 1998 or something like that when we played Total Annihilation together! We tried jerry-rigging a cheap laser pointer I got at a county fair to several sources of energy, including but not limited to a model plane Ni-Cd battery, packs of up to 12 AA's and a car battery, but the only thing we burned was first some of my father's leg hair, then a little patch on my index (both due to touching wires) and then the pointer itself, which overheated and melted due to the immense amount of power for what it was conceived for.

    ... the most I think about my childhood and teenage years, the most I wonder how I'm alive today; in other words, don't tinker with lasers to make them powerful if you don't have specific education in that field.

    But in any case, be careful, legislation on powerful lasers changes from one country to another (and, if I'm not mistaken, between states in the USA) and what may be legal in the country you're buying the laser from could very well be banned where you live.

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