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What is auto focus for fiber laser cutting machine?

Views: 215     Author: Site Editor     Publish Time: 2023-06-12      Origin: Site


Auto focus is a feature found in many modern fiber laser cutting machines that helps to optimize the focus position of the laser beam for different material thicknesses. The primary purpose of auto focus is to ensure that the laser beam is focused precisely at the optimal point to achieve the best cutting quality and efficiency.

fiber laser cutting head


Here's how auto focus works in a fiber laser cutting machine:

  • Height sensing: Auto focus systems use various sensors to determine the height or distance between the cutting nozzle and the material surface. These sensors can include capacitive, ultrasonic, or optical sensors.

  • Initial positioning: When a new cutting job starts or when the material thickness changes, the auto focus system initially positions the cutting head at a distance above the material surface.

  • Sensing and adjustment: The sensors continuously measure the distance between the cutting nozzle and the material surface as the laser cutting process begins. The system analyzes the data from the sensors to determine the exact focal point required for the current material thickness.

  • Focusing the laser beam: Based on the data gathered, the auto focus system adjusts the Z-axis of the cutting head to position the laser beam precisely at the optimal focal point for the given material thickness. This ensures that the laser beam is focused at the right spot for optimal cutting performance.

  • Dynamic adjustment: During the cutting process, the auto focus system dynamically adjusts the focus position to compensate for any variations or changes in the material surface height. This helps maintain consistent cutting quality and performance throughout the job.


The auto focus feature helps simplify the setup process and improves cutting efficiency, especially when working with materials of varying thicknesses. It eliminates the need for manual adjustment of the focus position for different materials, saving time and reducing the chances of human error. Additionally, auto focus enhances cutting quality by ensuring that the laser beam is focused precisely at the correct focal point, resulting in clean and accurate cuts.