Elliptical Flat

• For the elliptical flat is used in the aerospace telescope which allow a temperature range of -30°C to +50°C and a maximum of 95 % relative humidity (non-condensing). 
• The material we choose is fused silica, the thermal expansion coefficient is (5.3～5.8)×10^(-7)。JGS2 has the excellent optical property to meet the application environment and its competitive price will also reduce cost and save budget.
• For testing, we will use horizontal 24" (600mm) Zygo interferometer to measure surface accuracy such as PV and RMS. Normally, PV <= 0.167 and RMS <= 0.04 and we will achieve it better. See the below interferogram.
• About edge: edges can be blackened and there should be a circumferential 1mm/45° chamfering on both top and bottom side, in order to reduce the risk of conchoidal fractures in case of mechanical impacts on the edges.
• About coating: reflective 95 % aim at the visible spectre of light ,we normally meet requirements by using Aluminium as a base coating ,concerning long-term stability of coating, we normally use SiO₂ as the finish layer.
• Leadtime: 4 weeks since the order date.

Why do you choose MG optics to manufacture elliptical flats?

• For MG optics has the manufacturing equipment 1000mm continuous polishing machine and testing equipment Zygo horizontal 24" (600mm) to produce the diameter up to 600mm flat.
• We have more than 5 years experience to manufacture elliptical flats. Mature working process and techniques guarantee the quality and lead-time.
• Different materials such as fused silica , JGS1, JGS2,low expansion material,ULE, zerodur for your choice.
• European customers appraise that “we are totally satisfied with MG-optics performance, the flat surface accuracy is always beyond the requirement. From the efficient technical support to the delivery of the products, from manufacture to test, MG-optics is really professional and excellent.”