- Jun 20, 2015
I just wanted to mention that regardless of the factory GBall focus, the "can" can be left on and brought to perfect focus with a simple addition of a 1:1 positive lens set, as if you were going to add a spatial filter.. like (diode)=====> (| ---distance--- |) =========> adjusting the distance between the lenses to being the beam in to focus. If this is done you can also choose to put a pinhole in the focal point between the lenses to make it a spatial filter and get a much nicer beam out of it, or leave it alone for more power. As far as I'm aware, you can use either plano-convex or bi-convex lenses, as long as both lenses are the same. You could probably find two usable lenses with at least a half decent AR coating on them in an unneeded pair of binoculars.I was interested in the spot size out of the factory GBall lens, the one you pictured will do best in a module with our conventional lenses, G2,3E,G7,G9...
Some ( not all )[ ....] can be used with the factory GBall lens intact by adding a 3X beam expander, granted you can pull the can/GBall and use a 3 element lens followed by a 3X beam expander...
...I see the GBall's spot size which indicates pulling the cans would be best for these as is the case with most NUBM diodes, the 44 being the exception.
Also instead of using a a 1:1 lens set, simply using a pair of cylinder lenses should allow for the same focus correction after the GBall when adjusting the distance between the lenses, though it may only correct the focus in the fast axis (which may not be a bad thing and result in a really round beam)...someone may know more about this that can chime in.
I just wanted to mention this because you know what will happen if you de-can these diodes.. it may be desired to have a diode life of something more than 100 or so hours ;-)