I have recently developed an issue with my fiber laser (60 watt MOPA JPT) where the focus appears to be having issues. The main focal point has changed within the past month or so from what I would have been using for the past 2 years. Additionally, as seen in the photos below, I am having troubles with the consistency across larger graphics. I have swapped lenses to confirm whether it was a lens issue or not, as well as gone through the cleaning processes. After checking the innermost mirrors, I don’t see any dust or any indication of damage.
Any suggestions on what might be causing this issue?
