High energy densities are generated when lasers write the information on CDs.
SCHOTT‘s spherical lenses, used as objective lenses in CD/RW players, meet the high quality standards demanded from them.
Extremely precise focusing

First of all, the laser beam is widened and then aligned as a parallel luminous beam in the collimator. A directional mirror reflects the beam to the objective lens, shaped like a ”halved” spherical lens, which in turn focuses the beam with utmost precision on the information-carrying layer of the CD or DVD.