Elliptical mirrors provide a circular aperture and profile when aligned at 45° to an incoming beam, making them especially useful and efficient in periscope applications. Newport's elliptical broadband metallic mirrors provide a good combination of performance and value for general purpose applications. Elliptical broadband dielectric mirrors offer near total reflection over spectral ranges of up to several hundred nanometers, minimizing losses in all optical systems. And for Nd:YAG applications, elliptical laser line dielectric mirrors provide over 99% reflectivity at either 1064 or 532 nm. Elliptical mirrors utilize either N-BK7 or Borofloat 33 substrates.