Looking for short focal length glass lens for Aixiz module

I picked up some of the 2 watt lasers with 3 element lenses for an application. Nice, but ... I need a shorter focal length for my application. I will see if I can handle the problem by extending the threads on the module, but I am concerned that the beam may fan out and hit the edges of the lens (thereby wasting some radiant power.

At any rate, anyone know of a ready source on some shorter FL lenses? I presume single element glass would be ok for this application -- I just want to focus down to the smallest spot size possible. I think that something with an FL under 2" ought to do the trick.

Thanks