Which lens determines beam width in green DPSS?

[crazyhobo]

Is it the the focusing lens between the diode and the crystal set or the expanding lens between the crystal set and the collimating lens? I put the expanding lens from a dead new wish pen that had a wide beam with great divergence in my Lazerer Classic 150 that has a really thin ( <1mm ) beam to try and improve divergence, but nothing changed. First time working with epoxy BTW. Nailed it. The beam comes out at a perfect angle. :wave:

 

[Cyparagon]

The expanding telescope at the end determines beam size. Shorter focal length on the concave, or longer focal length on the convex will both make a larger beam.

 

[crazyhobo]

Thanks! I added a second expanding lens. It worked! I'm posting it in the experiments/modifications section.