Powell lens is a Laser Line Generator Lenses, which optimally draws into a straight line with good optical density and better stability. After leading the laser beam to pass through. It can also remove the The central hotspot of the Gaussian beam. he top of Powell lens is a complex Two dimensional aspheric surface . As the laser passes through, it will make Massive spherical aberration, Redistribute the light path, Reduce the light in the central area, Add edge light, and form an even straight line. It is suitable for Various biomedical, automotive assembly, food processing and other machine vision application. When design, we chose refractive index n=1.5 optical glass for small angle powell lens, But big angle powel lens will be manufacture by high refractive index n=1.8 optical glass. H-K9L and H-ZF7LA, JGS1 are the common glass. Powell lens are avaiable with 2-110 degree, The standard diameter is 9mm, but other size can be customized. Rectangular shape powell lens can be designed and manufactured.
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How to Understand Powell Lens?
Fan Angle: The fan angle width is a function of the glass refractive index and the apex angle. The higher the top inclination, the greater the glass refractive index, and at the same projection distance, the larger the sector angle. Small sector angles are typically made with optical glass with a refractive index of n = 1.5, while large sector angles are typically made with high refractive index glass of n = 1.8, or by increasing the top inclination angle.
Laser beam size: When the projection distance is fixed, the size of the incident laser beam determines the thickness of the laser line. A parallel laser beam with an elliptical cross-section may produce two straight lines that are either wide or narrow.
Uniform lines: The performance of the Powell prism is determined by the characteristics of the incident laser and the quality of the aspherical surface of the lens. By choosing a prism that is compatible with the laser module, uniform and consistent laser lines can be produced, meeting the high requirements of applications
Light intensity distribution: Uniformly illuminated laser lines, the light intensity within the central 80% length should account for more than 80% of the total intensity. If the energy in the middle part is too low, the brightness at both ends will increase. Reducing the brightness at both ends helps to improve the overall utilization efficiency of the laser. The following figure shows the differences in the distribution of light intensity in the central area of the same uniformly illuminated laser line..
Specifications
| Material: | H-K9L JGS1 UV Fused Silica |
| Diameter | Standard 9mm+0.00/-0.05 or 3mm to 60mm customized |
| Fan angle | 2-110degree |
| Beam diameter | 0.5-5mm or bigger |
| Uniformity | >80%(High Precison) |
| Straightness of line | 99.9%(High Precision) |
| Design wavelength | 385-1064nm |
| Surface Quality | 40-20 |
| Coating | AR Coating on request |
| Rohs | Compliant |
How to compare powell lens and cylindrical lens?
Cylindrical lenses, when used for laser beam shaping, still result in a light spot that is approximately Gaussian in distribution. However, using a Powell prism can make the distribution of the laser beam more uniform.
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