BK7 λ/10 D50.8x12mm Uncoated Windows or Substrates

Optical windows are used to transmit light and protect work areas or sensitive components from outside environment. Optical windows use substrates, coatings, or a combination of the two to transmit specific wavelengths or ranges of wavelengths, optical windows can also be used to optimize transmissions by transmitting only the wavelengths of interest.

As optical windows, BK7 features high uniformity, low inclusion of bubbles and impurity substance, and ease of manufacturing and machining. Therefore it is an excellent choice for transmission optical components. As substrates, BK7 is also advantageous in terms of fine mechanical properties and resistance to scratches, stable chemical properties. However, it possesses relatively high coefficients of thermal expansion, thus not adaptive to environments where temperatures are changeable.

Uncoated BK7 windows could also be used as substrates of mirrors. Mirror substrates are made of optical materials and are used for reflecting light beams, the optical properties is of little importance, since the substrate material have no impact on the mirror’s optical properties, the light beam does not pass through the substrates. Substrate material is mostly selected due to mechanical properties and working environment of the finished mirror element.

Hangzhou Shalom EO is a custom and off-the-shelf supplier, we provide uncoated versions of BK7 windows, which are befitting to be used as substrates for mirrors. The stocked BK7 windows including the Lambda/4 flatness types and lambda/10 types, while Lambda/4 flatness are low cost and suitable for most kinds of optical applications, and the Lambda/10 flatness is suitable for laser system and other high demanding applications.