The O-like modules have one lens glued to the module, and another lens in an adjustable mount that is glued in place once focused. It would be very difficult to change focus without a custom made assembly and some tweeking.
I have seen no need to change the focus on any of my green. They are all so bright there is no point. Divergence is kinda high but I'm not using mine long distance so no problem for me. They still go very far just a bigger dot on long distances. And I am not trying to burn anything with my green, I leave that to my reds and blu-rays.
There is no need to focus a green for burning. You want an add-on lens for that instead. Instead of going from a 0.5W laser to a 10W laser, you can go from a 10µm spot to a 1µm spot, and the cost of getting the better spot size is nowhere near the cost of bumping the power of the laser that much.
Ever better singlet lenses for diodes are neat, but for burning, a compound lens is best. It's expensive, but so is getting more power. If you don't want to fork over for a pro lens, there is always the option of trying a microscope objective (at least 10x; plan, achromat or plan achromat). And there may be people here offering ready made compound lenses.
A plan fluorite should do a decent job, per se, since the field is supposed to be very flat, and 532nm is pretty close to the design center wavelength for the chromatic aberration compensation. I believe a 10x might be a little bit on the light side, but it's worth a try.
If you decide to pick up another objective based on the results, go for an infinity corrected plan achromat dry objective. Shorter working distances usually translate into the objective using additional meniscus lenses on the end your beam will exit, which will translate into a lower effective f/#, better focusing and shorter distance to the focal point.
Additional benefit can be had from picking up a pair of lenses to expand the beam to fill about one third of the aperture of the microscope objective. Anchor optics has a series of good achromatic doublets (incl. negative achromats) in the experimental grade part of their site. Just make sure you get the first grade ones. CVI Melles Griot has a PDF that is equipped with all the formulas you need to design a beam expander. The shortest one is the negative-positive combo, but if you can't find a good match of lenses, the other one is more flexible in that regard.
I may decide to work on a dedicated head for burning with greenies, if my interest in optics sticks for long enough to do a good job of it. A group buy might bring the price down significantly. Don't hold your breath, though. I'm not always able to retain focus on more than one thing at a time, and the principal focus atm is in ophthamology.
larry how are u u got what i want how do i get one of thoes brass and glass lenz for the blue ray aixiz mod thanks the plastic ones keep striping out thanks brian
Hey larry I realize i noted my excitement in another thread but how long do you think it would take for you to test? Man I'm sure a shitload of people want that.
hi larry how do i pm u i dont under stand or see where that is sorry bout that i am new to this site some help would be great yes i want at least 1 for now thanks brian