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Field mirrors can be divided into flat field mirror (f-theta) lens and telecentric lens according to their functions. Telecentric lens is mainly designed to eliminate phase difference. It can keep the image magnification unchanged within a certain object distance, which is a very important application when the measured object is not on the same object plane. Telecentric lens is mainly used in machine vision where

A lens that works near the focal plane of the objective lens and can effectively reduce the size of the detector is called a field lens. To be exact, the field lens should work in the image plane of the objective lens. On the one hand, the object plane of the field mirror coincides with the main plane. According to the characteristics of the main

In general power output lasers, most of the lenses have large absorption of specific laser wavelength due to manufacturing process or external pollution, which shortens the service life of the lens over time, and sometimes affects the use or even stops due to the damage of the lens. The increase of laser wavelength absorption by the lens will cause uneven heating, resulting in the reflection