Table 3.

Surface roughness values before laser polishing.

Sample	Roughness ${\mathit{R}}_{\mathit{a}}$ (µm)
	0$°$	45$°$	90$°$
S1	4.715	15.581	20.167
S2	4.691	15.183	18.349
S3	4.478	15.284	19.508
S4	4.745	15.417	18.834
S5	3.932	13.919	18.262