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Function and Parameters of 1064nm Laser Scanning Field Lens

Field lenses are often used in infrared optical systems. It is to change the position of the imaging beam without changing the optical properties of the optical system.

The main functions of the field mirror are:

1. Improve the ability of the edge beam incident to the detector.
2. In the same main optical system, the additional field lens will reduce the area of ​​the detector; if the same detector area is used, the field of view can be enlarged and the incident flux can be increased.
3. Homogenize the non-uniform illumination on the photosensitive surface of the detector.




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The main technical parameters of the field lens:

When selecting a field lens, the main technical parameters considered are the working wavelength, entrance pupil, scanning range and focusing spot diameter.

Working wavelength: mainly depends on the wavelength of the laser, and the field lens is coated at a given laser wavelength. If the field lens is not used in the given wavelength range, the field lens will be burned out by the laser.

Entrance pupil: If a monolithic mirror is used, where the mirror is placed at the entrance pupil, the diameter of the largest available beam is equal to the diameter of the entrance pupil.

Scanning range: The larger the range that the field lens can scan, the more popular it is for users. However, if the scanning range is increased, the focused spot becomes larger, and the distortion degree also increases. In addition, to increase the scanning range, the focal length and working distance of the field lens should also be increased. The lengthening of the working distance will inevitably lead to the loss of laser energy. In addition, the diameter of the focused spot is proportional to the focal length, which means that when the scanning range is increased, the diameter of the focused spot increases, the spot is not concentrated enough, and the power density of the laser decreases very quickly (the power density is the square of the spot diameter). Inversely proportional), which is not conducive to processing. Therefore, users should choose the most suitable field lens according to different processing areas, or reserve several field lenses with different scanning ranges.

Focused spot diameter: For a scanning system with incident laser beam diameter D, field lens focal length F, and beam quality factor Q, focused spot diameter d = 13.5QF/D (mm). Therefore, a smaller focused spot can be obtained with a beam expander.




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