Lids with integrated windows, manufactured by the Hermetic Solutions Group, allow light to be transmitted from or received by optical components residing within the hermetic package.
The transparent window media is chosen to match the required transmitted wavelength. Windows are metallized and coated with customer specified anti-reflective coatings. We manufacture window lids to customer designs. Typically, a Ni/Au plated etched Kovar frame is used to support the window which is hermetically sealed often with Au/Sn solder preforms also manufactured by the Hermetic Solutions Group.
Window material options for visible NIR imaging include fused silica (0.185 µ – 2.1 µ transmission range) and quartz (2 µ – 16 µ transmission range). Sapphire, typically used in telecommunications, lasers, SWIR and endoscope applications, is available to support a 0.15 µ – 5 µ transmission wavelength range, while germanium for LWIR/thermal imaging application support a transmission range of 2 µ – 16 µ. Frame material options include Kovar, Invar and Alloy 42/48/48 and these materials can be plated with electrolytic or electroless nickel as well as electrolytic gold. They are manufactured with a chemical etching process in a flat, stepped rectangular. Window lids are typically soldered in place and are available for integration in most sensor and other opto-electronic applications.