Williams’ Visi-Lid™ - The first commercially available hermetic optical cover lid assembly.
Visi-Lid™
Visi-Lid™ is an optical assembly designed to pass light at specified wavelengths. In its simplest form, the assembly consists of an A/R coated and glass metallized window of sapphire, silicon or germanium with a solder frame tack welded to the metallized portion. More complex assemblies will require the metallized windows to be sealed to a plated Kovar frame, with either a solder preform being tack welded to the kovar frames or left bare for seam sealing. These assemblies can be used to hermetically seal various device packages.
Glass inset on plated kovar frame,
configured for seam welding
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Configured for direct glass
to package solder seal
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Window Materials
Window substrates suitable for infrared, ultraviolet, and visible light applications are available. Typical materials for windows: Sapphire, Germanium, and Silicon; other materials are available.
Anti-Reflective Coatings
Single layer or multi-layer material systems, custom designed to meet customer transmission requirements. Visible light, ultraviolet, and infrared coatings are available
Select Solders
Williams is an industry leader in developing and manufacturing solder alloys for Optoelectronic applications. See the chart below for the typical materials. Others are also available.
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Liquidus |
Solidus |
80Au 20Sn |
280 |
280 |
86Pb 8Bi 4Sn 1Ag 1In |
278 |
250 |
95.5Sn 3.8Ag .7Cu |
217 |
217 |
90Sn 10Au |
217 |
217 |
Benefits
- Complete packaging solution — one stop shop
- In-house design & manufacturing capabilities
- Extensive knowledge of solder sealing systems and assembly
- Engineering support from design through final assembly
The above description is of our standard products. Properties can be modified to meet specific needs.
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Have a question? |
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Developing a material for your application?
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