What does the focal length of a laser cutter refer to?

The focal length of a laser cutter refers specifically to the distance from the lens to the point where the laser beam converges and produces its most intense energy, known as the focus point. This distance is crucial in determining how effectively the laser cutter can focus its beam for cutting or engraving materials.

When the laser beam is focused at the correct focal length, it achieves a small spot size, which allows for precise cutting and high-quality results. If the focal length is too short or too long, the spot size may be larger, leading to a reduction in cutting efficiency or quality. Understanding and adjusting the focal length is essential for optimizing the laser cutter's performance based on the material and the desired cutting or engraving effects.