Brewster Windows for the Infra-red
These
polarization-selective windows are intended for use in high power laser systems. They transmit over 99% of the p-polarized radiation while
reflecting a large proportion of the s-polarized component.
Two different substrate materials are offered, Zinc Selenide and
Germanium. The Windows are
rectangular in shape so they present a square profile to the input beam when
used at the Brewster angle (67.4° for ZnS and 76.0° for Ge).
Zinc
Selenide Brewster windows transmit about half of the s-polarized component while
Germanium Brewster windows transmit less than 20% of the s-polarized component.
Widths
offered are: 6.35, 12.7, 15.2, 19.1, 25.4, 27.9, 38.1 and 50.8 mm.
Lengths
are 2.6X the width for ZnSe and 4.1X the width for Ge.
Thickness
varies from 2.0 to 5.0 mm as appropriate to maintain the flatness specification.
These
windows are normally supplied uncoated but we can offer a range of coatings to
suit the exact use of the window. Please
ask about coatings.