What is the difference in size between fiber optic marking field mirrors

For users who have used laser marking machines, I believe everyone knows that many laser marking machines, such as fiber laser marking machines, ultraviolet laser marking machines, CO2 laser marking machines, etc., are equipped with field mirrors. What is a field mirror and what are the differences in its size? Today, let me give you a brief introduction.

Field lens: also known as flat field focusing lens, scanning lens, F-θ Mirror. Mainly used to focus the light from the galvanometer on a plane. When making a purchase, it is important to specify the marking range and determine it according to your own needs. Do not blindly pursue larger sizes. The wavelength of both fiber optic marking machines and semiconductor marking machines is 1064nm, and their field mirrors are generally interchangeable. But sometimes when using the original imported Scanlab galvanometer, its field lens connection ring may not be M85 * 1, and the field lens is usually M85 * 1 threaded. In this case, a field lens adapter ring is needed.

The main function of a field mirror is to:

1. Improve the ability of edge beams to be incident on the detector.

2. Make the non-uniform illumination on the photosensitive surface of the detector uniform.

3. In the same main optical system, additional field mirrors will reduce the detector area. If the same detector area is used, the field of view can be expanded and the incident flux can be increased.

Many customers want to buy a large format field lens because they need to consider that their product needs to be made very large, and they may need a larger format. In order to achieve long-term benefits, they buy a field lens. However, you have forgotten one thing: the larger the field lens, the larger the corresponding focal length and working range of the field lens. The longer the focal length, the larger the laser focused spot, and the same laser is distributed over a larger spot area, which inevitably reduces the energy density and leads to shallow marking depth.

As we all know, the attenuation of laser energy in air is very severe. That is to say, the larger the focal length of the field lens, the greater the loss of laser energy, and the thicker and shallower the lines produced. So when choosing a field lens, you must choose the most suitable format, don't blindly pursue size.