Laser cutting machine of optical path length compensation measures

Laser cutting machine of optical path length compensation measures
the use of beam expander for beam collimation
the beam waist, and the relationship between and far-field divergence Angle is inversely proportional to the diameter of the waist diameter, the greater the far-field divergence Angle is smaller. The main purpose of the beam expander is by changing the location and size of the gaussian beam to improve the transmission characteristics of light beam, thus improve the instability caused by Yu Guanglu length change cutting. To beam collimation with respect to the current domestic research is not much, most of which are for the refraction, reflection type of research is less. Refraction type beam expander design, processing, adjustment is relatively easy, but due to the large lens easy temperature rise, which leads to the lens distortion, therefore refraction type beam expander applies only to small power laser beam collimation, such as laser cutting machine for high power beam collimation, basic it is using the reflection type.
the variable curvature radius of the lens ( VRM）
VRM control system is by adjusting variable pump output flow to change VRM lens inside the water tank in the water pressure, so that you can change the radius of curvature of VRM lens, thus to improve the transmission characteristics of the light beam. VRM system structure complex, high cost, some foreign technology advanced products adopt this kind of light path compensation measures, now rarely used in China.

optical path system such as such as optical path system has advantages of simple structure, low cost, easy to adjust, can ensure that in the continuous process on the focusing lens flare area is unchanged, ensuring that laser cutting machine in the cutting width can be stable cutting.