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Fat laser beams...

Discussion in 'LEDs and Optoelectronics' started by Externet, Apr 20, 2021.

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  1. Externet

    Externet

    797
    175
    Aug 24, 2009
    Hi.
    Perhaps title should say 'Fat beam lasers'...
    Has anyone played with them ?
    From curiosity, bought a couple to evaluate. Chinese cheap DPSS; supposed to be 50mW at 1.8V / 300mA, ~14mm.
    Aiming for a 1 mile range beam visibility at night. Do you think that power will do it ?
    Blue presents more scattering on theory, but green is more eye sensitive. Which should show better ?
     
  2. Nanren888

    Nanren888

    561
    168
    Nov 8, 2015
    Wow,,don't know what one is, but also not sure where one could legally or safely use such a thing.
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,501
    2,841
    Jan 21, 2010
    Well, the theory is that the beam width is so wide that the amount of power that can enter your eyeball is within safety limits.

    I'm not sure what effect it will have on beam spread over distance, however, a simple laser pointer on the ground at night is visible from the ISS of it is carefully pointed at it. So visible at more than a mile, yeah, sure, easy, depending on what you mean by visible.
     
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