Photo makes it clear… thank you.
Generally we call the first mirror you can adjust, m1 or mirror 1.
Keep in mind that if you have these three things
- properly working tube
- clean and aligned optics
- proper focus
They just work.
If I had to choose, I’d say it’s an alignment issue, however the tube could be out of resonance or TEM mode, which causes strange issues like this.
Many machines experience the 4th corner problem, where there is a misalignment occurring with only one of the corners.
This can be a critical alignment issue or the frame could be out of square.
Russ Sadler spoke about this in one of his videos and he’s been successful doing this by:
An infinitesimally small adjustment of m1 to correct this. If you move m1 too much, you throw all the alignment out, so it’s critical you don’t move it much. Never had the issue with mine, that leaves me unable to really suggest an amount but I’d think it’d be less than what the screw moves when you snug it down. Most want to take the screw with it to some extent when you’re trying to lock it.
If you can be more definitive of the areas that it’s failing and show us a photo of it’s mode, would be great. Also how aligned is aligned?
