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    Adding an External Lens to Focus Beam

    Hello all, I am extremely new to lasers so I welcome all the help I can get! I recently purchased a laser (120mW 520nm 50m diving laser) for some underwater work. When I tested it out on land, I noticed it had quite a large divergence when shot over 200ft. Correct me if I am wrong, but I don't...
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    Cold Underwater Laser

    Thanks for the responses eveyone! I live in the states and this project will be on Lake Champlain in VT. There are a few different options for using lasers to measure distance underwater, but I am only needing them to establish 90° angles for a grid system. It may sound silly, but this is the...
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    Cold Underwater Laser

    Thank you for your reply! Any advice is really helpful.
  4. G

    Cold Underwater Laser

    Hello all, I am looking for a laser to help me measure underwater. There are a few downsides... it will be in 35°F (about 1-2°C) and at 100 ft deept, and this lake is quite silty (fairly bad visability). Would anyone have suggestions as to where I should look? My limited laser knowledge tells me...


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