Focus lens reflection
Focus lens reflection
(OP)
I would like to get peoples thoughts and opinions on this matter it’s not a test so please don’t guess. Is it possible for the focus lens to reflect the beam backwards while cutting a non-reflective material like mild steel? aluminum, brass and copper for sure but mild steel.





RE: Focus lens reflection
PS: any material will bounce some of the beam back, even mild steel(especially metals if you are using 1064nm laser).
RE: Focus lens reflection
RE: Focus lens reflection
Aluminum ~85%
Steel ~70%
Piercing through is the biggest problem time as molten material is highly reflective and launching light in all directions. It is important to pierce through quickly when dealing with Copper.
For MS, you have nearly zero worry. most AR coatings with a Normal Angle of Incidence are </= 0.1% per optical surface so the optical reflectivity should never be a concern. as you move away from normal AOI, you start to get higher and higher reflectivity.