This listing is for the sale of one (1) replacement window for an Ideal Vacuum Glass Vacuum Gas Cell with the following characteristics:

• Material: Germanium.
• Dimensions: 1" (25.4 mm) OD, 0.197" (5 mm) Thickness.
• 0.5° Wedge Between Transmitting Surfaces.
• Surface Flatness: λ/2 Over Central 10 mm, λ Over Entire Clear Aperture.

These windows are suitable for IR laser applications. The 0.5° wedge helps prevent unwanted etalon effects, fringe patterns, and cavity feedback. These windows are uncoated for use over their entire optical range.

Germanium Properties

Optical Transmission Range: 2 to 16µm Refractive Index: 4.0026 at 11µm Reflection Loss: 53% at 11µm (2 surfaces) Absorption Coef.: 2.7 x 10-2 cm-1 at 10.6µm

Chemical behavior of polished surfaces Climatic resistance class CR (n/a) (ISO/WD 13384) Acid resistance class SR (n/a) (ISO 8424) Alkali resistance class AR (n/a) (ISO 10629) Phosphate resistance class PR (n/a) (ISO 9689) Stain resistance class FR (n/a) Suitable for use with water