LPF Site Supporter
- Jun 12, 2015
Yep, a galvo. See above
Do you imagine a grating on a 5mW or less pointer will be bright enough on grass in full 12 noon clear sky daylight.
It's offered on eBay for $7.65 + $5 shipping see: https://www.ebay.com/itm/Circle-Dif...388225&hash=item1f172fc973:g:E~gAAOSw~gxfc8ttGrating on laserpointer. https://i.ebayimg.com/images/g/E~gAAOSw~gxfc8tt/s-l400.jpg
not sure were to buy but thats a picture of the result. no moving parts. You have to use optics to change the size.
The OP doesn't just want to make one piece for himself to play with on his property with whatever output is needed to do the job. He wants to obtain a US Patent for busness reasons so I would guess he wants the final iteration of his imagned device to be viable as a product that can be sold within the USA without restriction.with a grating you spread the energy so the caclutaion for mpe will yield a much higher power than 5mw and will depend on the size of the ring and the thickness of the ring. I think a 50 or even 100 mw laser might be feasible and still meet mpe. Also remember with a grating as compared to a scanned circle the peak power is reduced everywhere. Will it be visible in moon sun. Yes from a few feet but not more. If you figure out the flux at noon you’ll see your sunk before you start. But what do I know. Try it. Too bad they don’t make cheap 575nm. That yellow is visible in direct sun. I have 36mw and can see the beam and the dot at a couple hundred feet. Never seem another wavelength that can do that.