Double-Concave Lense
Double Concave Lenses are used in beam expansion, image reduction, or light projection applications. These lenses are also ideal for expanding the focal length of an optical system. Double Concave Lenses, which have two concave surfaces, are Optical Lenses with negative focal lengths.
The wavelength of SYCCO general windows substrate(without coating)
1) Processing Range: φ10-φ300mm
2) The Best Fit Radius: Convex Surface +10mm∞, Concave Surface -60mm∞
3) O.D.FO The Polished Part: φ10φ220mm
The Best Fit Radius: Convex Surface +10mm∞, Concave Surface -45mm∞
4) Profile Accuracy (By Taylorsurf PGI) : Pv0.3μm
5) Surface Finish Standard: 20/1040/20
6) Be in Accordance With Mil-o-13830A
7) Single Piece Work
a. Other optical glass materials from Schott, Ohara, Hoya or Chinese CDGM, UVFS from Heraeus, Corning, Germanium, Silicon, ZnSe, ZnS, CaF2, Sapphire are also available upon request .
b. Custom-made Spherical Lenses at any size from diameter 1.0 to 300mm are available upon request.
|
|
B270 |
CaF2 |
Ge |
MgF2 |
N-BK7 |
Sapphire |
Si |
UV Fused Silica |
ZnSe |
ZnS |
|
Refractive index (nd) |
1.523 |
1.434 |
4.003 |
1.413 |
1.517 |
1.768 |
3.422 |
1.458 |
2.403 |
2.631 |
|
Coefficient of dispersion (Vd) |
58.5 |
95.1 |
N/A |
106.2 |
64.2 |
72.2 |
N/A |
67.7 |
N/A |
N/A |
|
Density(g/cm3) |
2.55 |
3.18 |
5.33 |
3.18 |
2.46 |
3.97 |
2.33 |
2.20 |
5.27 |
5.27 |
|
TCE(μm/m℃) |
8.2 |
18.85 |
6.1 |
13.7 |
7.1 |
5.3 |
2.55 |
0.55 |
7.1 |
7.6 |
|
Soften Temperature(℃) |
533 |
800 |
936 |
1255 |
557 |
2000 |
1500 |
1000 |
250 |
1525 |
|
Knoop hardness (kg/mm2) |
542 |
158.3 |
780 |
415 |
610 |
2200 |
1150 |
500 |
120 |
120 |
a: Dimesion size : 0.2-500mm , thickness >0.1mm
b: Many material could be choiced , include IR material like Ge, Si, Znse, fluoride and so on
c: AR coating or as your request
d: Product shape : round , rectangle or custom shape
