Hangzhou Shalom EO has developed a double surface polishing method for the production of High Precision Thin Optical Windows or Substrates, where the surfaces of the windows or substrates are polished in one go, achieving accurate control of surface flatness while elevating the surface quality to 10/5 S/D. The high-precision thin windows manufactured in our factory are of outstanding functionalities that could meet the criteria for ultra-thin (0.1mm, 0.2mm) windows or substrates with high surface flatness (Lambda/10 or Lambda/4 @633nm), oriented for applications for precision optical systems such as Femtosecond lasers, whose market share is surging in recent years.
The double surface polishing method is a processing technique, where both of the two surfaces of optics complete their polishing procedure in one go. The optics are not put on pitch plates during the procedure, so that is no stress-releasing problem caused by bonding and detachment between the optics being polished and the carrier plate, which eliminates the variation of surface flatness of the window substrate to a significant extent.
High Precision Thin windows made from BK7, UV Fused Silica, and Quartz Crystals are available in Shalom EO, the windows feature superior surface quality of 10/5 Scratch/Dig, parallelism of 10 arcsec, with minimum thickness down to 0.03mm, diameter down to 0.5mm. N-BK7 is beneficial wavelengths from the Visible to IR spectrum (350-2000nm), and UV Fused Silica is recommendable for UV wavelengths due to low absorption in the UV range. Both of them are renowned optical glass materials with substantial mechanical strength and thermal stability and can endure operations under various conditions. Besides, windows made from Quartz Crystal are also provided.
The standard specifications of Thin BK7, UVFS, and Quartz Crystals Windows offered in Shalom EO include 12.7mmx0.2mm with λ/2 flatness, 12.7mmx1.0mm with λ/10 flatness, 25.4mmx0.2mm with λ/2 flatness and 25.4mmx1.0mm with λ/10 flatness, in addition to other custom dimensions. The windows could be configured with mounts for ease of handling, both uncoated window substrates and custom AR coatings are available.