<p>The working principle and role of laser field mirror </p><p>Generally speaking, the laser beam in the marking system will produce off-axis deflection after passing through the focusing lens system, which will result in abnormal images or aberrations on the marking surface relative to the ideal plane. Flat field focusing mirror, also known as field mirror, f-theta focusing mirror, is a professional lens system, the purpose of the laser beam in the entire marking plane to form a uniform size of the focused spot, is one of the most important accessories of the laser marking machine. Field mirrors can be divided into f-theta lenses and telecentric lenses. Due to the high cost and expense of telecentric lenses, f-theta lenses are mainly used in laser marking machines for industrial applications. In the absence of deformation, the position of the focusing point depends on the focal length of
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