Silicon (Si) Windows

  • Transmits wavelength range 1.2-7 μm
  • Ideal for weight sensitive applications
  • Cheaper than germanium and ZnSe

Silicon (Si) Windows manufactured from optical grade silicon are popular for the 1.2 – 7μm spectral region due to their low cost and low density. Due to its low density (half that of germanium or zinc selenide), silicon is ideal for weight sensitive applications, especially those in the MWIR thermal imaging  3 – 5μm region. Density is 2.329 g/cm3 and Knoop Hardness is 1150, making it harder and less brittle than germanium.

Materials Silicon crystals
Diameter Range ~ 300mm
Aperture >90%
Dimension Tolerance +0.0/-0.2mm
Thickness Tolerance +/-0.2mm
Surface Quality 80/50 S/D
Parallelism 1 arc minute
Chamfer 0.3-0.5mmx45degree
Coating AR/AR or DLC/AR


Optical Windows

A variety of  optical windows are offered in Hangzhou Shalom EO:  circular windows, rectangular windows, wedged windows and elliptical windows, with dimensions range from Diam. 0.8mm to 300mm. We are able to process the large volume productions, and also deal with the small quanity of prototypes. A wide range of  optical crystals and optical glass materials substrates are available.


Materials BK7, B270, FS, BaF2, CaF2, MgF2,Quartz, YAG , Ge, Si, Sapphire, ZnSe, ZnS and other customized materials;
Spherical configurations circular windows, rectangular windows, wedged windows and elliptical windows
Size Tolerance +/-0.1mm
Thickness Tolerance +/-0.2mm or upon request
Surface quality(S/D) 40/20 or upon customer’s request to 10/5
Aperture 90% of central dimension
Flatness Lambda/4 @ 633nm or upon customer’s request to Lambda/10 @ 633nm

Note: The custom specifications are available upon customer’s request.

Infrared Optics >> Infrared Windows

IR Windows-Infrared Windows Assemblies for Thermal Imaging Inspection

Inspection is necessary for high power and high voltage electric installations to avoid the possible accident, the thermal imagine is found to be the optimal and effective way for this application. In some countries, thermal imagine inspections is compulsory for accident insurance. And in some industrial equipment likethe high temperature metallurgic oven, it is necessary to use the thermal imagine to watch its temperature inside. An infrared windows assembly is needed to be installed on the housing of the electric and industrial equipment as the viewport windows for thermal image camera.


High power and high voltage electric installations, switch cabinet;
High temperature metallurgic oven;
Mineral and petroleum industry.

Design and standard
The windows assembly consists of metal flange, crystals windows and metal protective cover;
The protective cover is fixed by two small magnet nubs;
The whole windows is fixed on the cabinet house by the flange, no screw is needed;
Various types of infrared crystals is available: CaF2; BaF2; Germanium; Sapphire; Silicon; ZnS; ZnSe;
Confirm to the dust tight standard IP67 of NF EN6052.

Materials Used 
Flange Metal
Housing or Cover Metal Materials
Optics CaF2, BaF2, Ge, Sapphire, silicon, ZnSe, ZnS windows
Cover fixing Fixed by Magnet nub
Water and dust ingress IP67 of NF EN60529
Typical Dimensions 
Models Body Diameter Crystals Diameter Viewing Diameter Assembly Thickness
SHIRW-60 84 mm 60mm 55mm 22mm
SHIRW-75 99 mm 75mm 70mm 22mm
SHIRW-100 124 mm 100mm 95mm 22mm

Application notes
Installation steps
Step 1: Calculate and decide the position where the windows would be installed according to the view angle of the thermal imagine camera;
Step 2: Drill a hole according to the size of the windows assemblies;
Step 3: Install the whole windows assemblies;
Step 4: Open the protective cover and make the testing of the inspection.
Select the suitable crystals materials for your applications:
Several factors you should take into consideration during the selection of crystals materials: Wavelength range, environment (temperature, humidity and vibration ect.) and cost. Here is the specification of the materials for your reference.