|
|
|
|
|
|
|
Spherical Biconcave Lenses
 |
Crystaltechno Ltd. manufactures spherical biconcave lenses from fused silica, glass and different types of optical crystals.
Spherical biconcave lenses are widely used as divergent transfer optics.
|
|
PARAMETER |
|
VALUE |
|
|
|
|
|
|
|
|
| |
Surface figure |
|
Lambda/2 per inch |
|
| |
Scratch-Dig |
|
40-20 (FS, BK7)
60-40 (CaF2, BaF2, MgF2, LiF, Ge, Si, Zinc Selenide (ZnSe) CVD)
80-50 (KRS-5)
|
|
| |
Diameter tolerance |
|
± 0.1 mm |
|
| |
Paraxial Focal Length Tolerance |
|
± 2% |
|
| |
Centration |
|
less than 5 arc minutes |
|
| |
Clear aperture |
|
90 % |
|
| |
Bevels |
|
(0.3-0.5) mm x 45° |
|
|
|
|
|
|
 |
|
|
|
Crystaltechno LTD makes spherical biconcave lenses from the list of optical materials below:
CaF2
BaF2
MgF2
LiF
KRS-5
BK7
Fused Silica
Si
Ge
ZnSe
Ordering Info
|
|
|
