The application of optical lenses has become widespread in various industries, and their role is becoming increasingly important. Therefore, optical lenses have become the focus of attention for the new generation. Optical lenses mainly include focusing flat convex lenses, beam expanding astigmatic flat concave lenses, biconvex lenses, biconvex lenses, etc. Today, we will mainly take a look at how to choose the appropriate focusing lens?
For the same laser beam, the relationship between the focal length of the focusing lens and the focal size is: the shorter the focal length, the smaller the focal point, and the shorter the depth of focus. The longer the focal length, the larger the focus and the longer the depth of field. The size of the focus and the depth of field are contradictory.
What is depth of field? Depth of field refers to the length of the laser power intensive area that can form processing capability after laser focusing. The longer the depth of field, the more advantageous it is for processing thick materials. However, as the focus increases, the cutting ability will decrease accordingly. The smaller the depth of field, the smaller the focus size, which is beneficial for cutting ability but unfavorable for cutting depth. At the same time, there is an increasing demand for the neatness of the processing platform, that is, it becomes sensitive to the unevenness of the platform. Therefore, the selection principle of the focusing lens is to use shorter focusing lenses as much as possible.