Confirm the exact configuration
Use the manufacturer part number and model code—not appearance alone. Connection, size, material, voltage, pressure, seal, and control options can differ within the same product family.

Thorlabs
Manufactured by Thorlabs, the LB7638-E3 is a Ø1" zinc selenide (ZnSe) bi-convex lens featuring a focal length of 100.0 mm and an anti-reflective coating optimized for the 7 to 12 µm wavelength range. This component carries a package weight of 0.05 lbs each, with its lifecycle status available in current manufacturer documentation following its June 13, 2017 release date. Submit the exact part number, quantity, and application requirements to request a quote.
Industrial and obsolete parts are priced per enquiry: the final price depends on available stock, condition, quantity, and your delivery destination, so a fixed list price would be misleading. Request a quote and we confirm current pricing, lead time, and sourcing options — including hard-to-find and discontinued Thorlabs references — within one business day.
For a faster response, include quantity, condition, and delivery destination.
Verified configuration
Engineering context
Use the manufacturer part number and model code—not appearance alone. Connection, size, material, voltage, pressure, seal, and control options can differ within the same product family.
Provide quantity, delivery country and ZIP/postal code, required condition, target date, and photographs of the existing nameplate when available.
Our sourcing response is prepared against Thorlabs LB7638-E3. Final compatibility remains subject to the machine manufacturer’s requirements and complete application data.