Mirror is the item which reflects the laser beams. The components to be considered in particular are size and coating, and both of them are selected according to the laser specifications.

The size of the mirror is selected according to the size of the laser beam (diameter of laser beam) and the coating is selected according to the wavelength of the laser beam.

Our nominal mirror size is assumed to be in an incident angle of 45°. The diameter of laser beam becomes minimum when the incident angle is 0°. As the incident angle increases, the laser irradiation shape expands into an ellipse.

With our standard specification, we design our mirror to drive up to ±10°(mechanical angle) centered on an incident angle of 45 °. If more than 55°incident angle is expected, the laser beam will run over unless a larger mirror is used.

Of course, the moment of inertia will increase because the larger the mirror, the heavier it becomes. Therefore, large acceleration torque is required and this makes the current large.

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