520nm laser, direct without the frequency doubling so they are advertised as OK down to -10C.
In the standard GRP it seems to be the IR to Green bit that is the temperature problem. I suspect the crystal uses thermal energy to double the frequency somehow.
The 520's are a direct output from a laser diode.
Laserland(s) sell them in the US standard of 5mw, think only as 5's.
So don't think I am breaking any rules here.
Would be a lesser cost to find out, and may do what you want. As in stay on.
After that I expect that a rifle sight one is required, full adjustment present on the unit. Would likely need a small heat source however I expect.
Reason I know the laserland one is I have just ordered one to find out.
Better add that the site seems to describe them on the page as 510nm but think that is a typo.
Edited by sg6, 14 December 2019 - 02:57 PM.