I am working with a variable power laser system that has a wavelength of 0.8μm – 1.1 μm. The issue is the laser beam welds or cuts the test sample but continues on afterwards. A stainless steel planish wheel has been experimented with to stop the laser beam and support the test material that is being welded together. However, this only lasts 5 or 6 welds until it needs to be replaced. A proper life cycle for the material should be upwards of 1,000 weld cycles. Is there a proper way to properly diffuse the laser beam reducing damage below the test sample?

I am working with a variable power laser system that has a wavelength of 0.8μm – 1.1 μm. The laser set up in the lab must be able to weld any gauge of material together for the experiment to take place. Thinner gauge material sheets must be supported in order for a proper weld to take place. Thus, the introduction of a supporting wheel or device was introduced. Currently, the laser beam welds or cuts the test sample but continues on afterwards. Damaging the supporting mechanism below. A stainless steel planish wheel has been experimented with to support the material and resist damage by the laser beam. This only lasts 5 or 6 welds until it needs to be replaced. A proper life cycle for the material should be upwards of 1,000 weld cycles. Is there a proper way to properly diffuse the laser beam reducing damage below the test sample?