In some demanding applications like DUV (deep ultraviolet) lasers, ultra-high power laser systems, and ring laser gyroscopes, high reflection and low scattering mirrors are the necessary and critical components, low roughness substrates are used to make these kinds of mirrors, the super-polishing technique is often used to make the low roughness mirrors substrates. Hangzhou Shalom EO develops the super-polishing technique to make the Super Polished Optics of roughness less than 1Å, with our classical super-polishing production line, atom force roughness measuring system, and Zygo interference flatness test instrument, we are capable of providing the Super Polished Mirrors/Substrates and Laser Gyro Mirrors in stable and surpassing quality and volume quantity.
Unique classical polishing method
Although the magnetorheological fluid polishing method is thought to be a promising measure to make the extra lower roughness optical surfaces, its high cost and low production rate make it unpractical in industrial applications, therefore most of the super-polished optics are made from the classical polishing method. A unique processing of classical polishing is developed to make the super-polished optics, the pitch plate is used as the polishing module, and <1Å roughness can be obtained by our polishing craft. The testing shows that our substrates and mirrors work well in the laser gyro system.
Product Features:
- A variety of substrate materials: BK7, UV fused silica, Zerodur, ZnSe, ZnS, Ge, Si, CaF2, MgF2, and Sapphire.
- The unique polishing technique developed upon the classical polishing method
- Surface Roughness down to 1Å
- High Reflection (HR) coating and Anti-reflection (AR) available
- Applications: DUV lasers, high-power lasers, gyroscope
Test results:
1. Results by Atom Force Microscope
For the primary scattering test, we use the green laser of 25 and 40 mW, the scattering point can be found by watching the reflection laser light from the surfaces of the optics, this is easy and fast, and is used as the primary test of surface roughness. For the final test of the roughness or scattering test, the Atom Force Microscope (AFM) from Bruker is used to measure the final roughness of the polished optics. Please see the following picture from the AFM measuring system.
2. Results by Zygo Interference Module
The Zygo Lambda 2000 series Module GPIXP-D6” is used to measure the final flatness of the polished surfaces.
