PRODUCTS

Yamamura Photonics is developing TO-Cap that uses CaF₂, which has excellent transmittance from ultraviolet to infrared (~ 9 μm), as window materials.
Generally, it is difficult to join CaF₂ and metals with sealing glass because of the large difference in the coefficient of thermal expansion. However, we actualize to join CaF₂ and metal cans by using the resin material named "hybrid material". The "hybrid material" was developed by our parent company Nihon Yamamura Glass as the joining material. In the caps with the "hybrid material", the residual stress due to the difference in expansion coefficient is absorbed by the flexible bonding layer. Therefore, CaF₂ and metal cans can be joined, maintaining a certain hermeticity.
CaF₂ has good optical properties with a transmittance of 90% or more over a wide range from ultraviolet to infrared without optical coating. Therefore, cost reduction is expected compared to caps for mid-infrared wavelength region (4-9 μm) applications that use Ge with optical coating as window parts.

Size: TO-5, TO-8, etc.
Window Material：CaF₂(Single crystal)
Shell Material: Kovar, SUS, etc.
Hermeticity：Around 1×10^-8Pa・m³/s
Transmittance: T> 90% @ ~ 9μm (Non-Coating)
Heat resistant Temperature: 250℃ (in the air)