Welcome To, Nanjing Intane Optics Co., Ltd

High LDT Coatings

Technical requirements: 

1.Aperture:D1230

2.Coating:Reflecting dielectric coatings;wave band:420nm~800nm; average reflectivity:≥97%

3.Eccentricity  between the  primary  mirror's  optical  axis  and the excircle:≤0.5mm

4.Uncoated mirror surface:PVr≤λ/4;RMS ≤λ/40(λ=632.8nm) 

5.Coated mirror surface:PVr ≤λ/3;RMS ≤λ/30(λ=632.8nm)     

6.Error of radius of curvature at top:≤1mm

7.Perpendicularity between the optical axis and back face A:0.05mm

Precision of Optical Machining
Optical machining precision ≤0.5mm
Size φ266
Error of radius of curvature at top ≤1mm
Perpendicularity between the optical axis and end face A 0.05mm
Roughness of reflecting surface ≤2nm
Uncoated mirror surface flatness PVr≤λ/4,RMS≤1/40 (λ=632.8nm)

Result of the surface flatnes test inthe 0°direction in a φ1200mm aperture range before coating of the large-field primary miror.

Technical difficulties:
1.Coating   requirements:Reflecting  dielectric  coatings;wave   band:420nm~800nm;average   reflectivity:≥97%(angle  of incidence:<15°)(The thick coatings results in some difficulties.)
2.Due to the large product size,the coatings uniformity is difficult to control. 

3.Coated surface accuracy:PVr  ≤λ/3;RMS  ≤λ/30(λ=632.8nm)

Zone Begin End Divisor Area Result
1 420.00 800.00 380.000 37443.539 98.536
2

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