M² factor is an indicator of laser beam quality, which describes the deviation of the real beam from a theoretical beam.

Focus Beam Measurement of Femtosecond Laser after the Installation in the machine.

It shows the real time measurement of diameter in helical drilling process. The drilling diameter changes on time according to the programmed parameters. The entry and exit diameter of holes maps with the measured circle diameter in focus and refocus surface. It is a precise tool to analyze the dynamical movement of laser for the process development. It makes compensation of drift and improves the stability in the mass production.