What improved greatly, was the consistency of beam width and cutting depth across the entire work area. It no longer experience blurry lines or insufficient cuts in the areas farthest from the home position. Even with that low power laser the beam is much tighter, much smaller, higher intensity dot.
How to determing focal length
Advanced PVD zinc selenide material
Light transmittance: ≥99.5%
Precision slicing polishing and grinding process, high temperature resistant laser, excellent optical performance, high working efficiency.
