Powell lens
Powell lens is used to generate straight line. With aspherical curvature on its apex, the output line from powell lenses is even distribution of energy. For comparison, Cylindrical lenses generate gaussian beam profiles with hot-spot centre points and fading edges.
The uniformity of output line is also related with incident wavelength, beam size, divergence, and working distance.
To get even distribution of energy, the apex curvature needs to be slightly modified and optimized for particular laser beam.Fan Angle | 5 deg, 20 deg, 25 deg, 30 deg,45 deg, 60 deg, 70 deg, 90 deg, 110 deg |
Material | BK7, Fused Silica, SF6 |
Design Wavelength | Custmer design |
Dimension Tolerance | +0/-0.05mm |
Thickness Tolerance | +/-0.1mm |
Surface Quanlity | 40-20 or better |
Surface Figure | Cyl surface: lambda/2 or better@632.8nm |
Center Error | ETV better than 0.01mm |
Clear Aperture | 90% of diameter |
Bevel | Protective bevel |
Coating | BBAR or custmer design |