Using a concave lens to increase divergence

r = 1.5 mm * 4 m * |-3| m^-1 + 1.5 mm = 19.5 mm

Which means that the beam will be 39 mm wide at 4 m. Assuming a circular beam with a flat profile (not very realistic though) the following equation can be used to calculate the irradiance, which is really what matters from a safety perspective:

For example, using a -3 diopter lens to diverge a beam with a 3 mm diameter and measuring at 4 meters:r = 1.5 mm * 4 m * |-3| m^-1 + 1.5 mm = 19.5 mmWhich means that the beam will be 39 mm wide at 4 m. Assuming a circular beam with a flat profile (not very realistic though) the following equation can be used to calculate the irradiance, which is really what matters from a safety perspective:

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Plano Concave Lenses, or, PCX Lenses, are used to expand light, or, diverge a collimated beam and produce a negative focal length.  Choose from either N-BK7 or Fused Silica in this section and one of our standard broadband AR coatings.  We also offer numerous alternative AR coatings, suitable for a variety of laser wavelengths.  Cant find what you need?  Ask us to modify a stock lens for quick delivery, or, send us requirements for a complete custom solution.  

For more information, please visit plano concave lenses.