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A word of caution, do not try and import a laser greater than 1mw as they are a customs restricted import, and you will not get a laser but instead a nasty letter warning you not to attempt this again. In Qld you can (legally) own a laser up to 20mw, if you are a member of a recognised astronomy club, and if you want to import one you will have to fill out a lot of paper work and wait a couple of months to get approved by police and customs. If you have a QLD firearms licence you can have a laser (sight) up to 10mw.
It is perfectly legal to import the parts to assemble your own laser, as long as they don't come in the same package.
Even a high powered laser becomes invisible when viewed side on after only a short distance. The beams intensity is directed straight forward for many kilometers but as it is only about 1mm wide it is not bright side on. Green is the only one to get you will need to get at least a 250mw red laser before you will see a beam at all.
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