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Welcome to the forum. Study the posts carefully and you can become a proficient laser builder

Welcome to the forum. There are too many easy choices. Just be safe and keep the laser away from children. Shiny/reflective surfaces will cause an eye injury very easily.

It's a bad idea to use a laser. Unintentional blinding potential from unforseen circumstances. Lasers are only safe when all precautions are taken. Too many variables.

Keep it going. I'm still kicking. Been scuba diving in the Philippines quite a bit until covid hit

Recently found out that 2 of my cousins live in the Philippines and are married. They built a diving resort.

Me diving on Mindoro in the Philippines.

Me diving the Alma Jane shipwreck on Mindoro Philippines.

If you want to do it safely, use a hobby rocket igniter on a long twisted pair of wires. Toggle your switch and light the fire. Pull your igniter out with the wires before it goes up in flames. Remember though, we are scientists. Cold calculating scientists. We don't do this for fun. :D

Crazy awesome LewDude! That's very creative. 2 thumbs way up.

Impressive looking build! Yeah it's me. haha Have to rep you on this one. :)

Nice comparison! Thanks for posting, OP. :)

Being able to clearly see the beam over great distances is truly amazing. I'm assuming you can set the focal point to infinity correct?

Welcome Pman! Usually your first build will be <5mw until you become more proficient. Careful!

Here's the colour of 577nm.... https://www.youtube.com/watch?v=IYMFDwZ7r4I I still enjoy the 589nm beam at 20 watts....