Conic lens method is used to produce hollow beam is the most convenient and effective, especially the use of two axis coincide, Cone and cone bottom equal to the angle formed by the combination of inside and outside cone lens, you can get better quality collimated beam.
Specifications for axicon lens
1/4 lambda @632.8nm
Laser machine, medical apparatus and instruments, beauty instrument.
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Our in-house metrology laboratory is capable of measuring key properties and parameters of optical components such as transmission and reflection from 175nm to 20um, mechanical dimensions, surface accuracy, surface quality, flatness, parallelism, squareness, angle, centering, MTF, focal length and radius of curvature.