The spot size measurement of the scan light is shown in Fig. 5. The measurements are made for a number of observations along the scanning line. The RPM value is kept at 8000. The distance chosen is 165 mm which is the effective focal length of the F-theta lens. The measurement shows a variation of 1.5% of the spot size along the scanning line. The mean spot size is 340.78 µm. Measurement of the spot size away from this location gives a variation of the spot size. For example at 123 mm, the spot size ≈679 µm and at 193 mm it is ≈412 µm.