Large aperture, passive optical athermalized beam expander for eye-safe lasers

摘要

A passive 5x athermalized afocal beam expander comprising a housing integrally formed of a single material. Using titanium for the housing as well as lens materials having a minimal change of index of refraction over changes in temperature provides for a 5x athermalized afocal beam expander constructed to operate in a wavelength range from about 1460 nm to about 1675 nm at temperatures ranging from about −40 degrees Celsius to about +75 degrees Celsius.