OPTO4U has selected a range of singlet spherical lenses made of BK7 or Fused Silica, that fit most applications in UV, visible and near IR ranges. We polished the surfaces with Lambda/4 accuracy.
We are manufacturing all other kind of singlets in various shapes & materials. Just ask us
A collimated beam of light passing through a negative lens - plano concave or biconcave - is diverged
The best choice for imaging or focusing beam light
Cylindrical lenses