Meniscus Lenses, D=25.00mm, F=35.00mm, Uncoated Ge Single Crystal, United Optical Technology Co., Ltd (CAT#: STEM-OP-1998-YJL)

Meniscus Lenses, D=25.00mm, F=35.00mm, Uncoated Ge Single Crystal, model 150052, is manufactured by United Optical Technology Co., Ltd.
Germanium (Ge) Meniscus Lenses are meniscus lenses based on germanium.
A meniscus lens has an outer convex mirror surface and an inner concave mirror surface. If the convex curvature is greater than the concave curvature, the lens has a positive focal length. When used in combination with another lens, a positive meniscus lens can shorten the focal length, thereby increasing the numerical aperture of the system without introducing significant spherical aberration. (NA); if the curvature on the concave side is large and the curvature on the convex side is small, it is a negative meniscus lens.
Note: Germanium material contains harmful substances, please wear gloves when using it and wash your hands after use.

Diameter: 25.00mm
EFL: 35.00mm
Coating: Uncoated
Material: Germanium (Ge) single crystal
BFL: 33.30mm
Curvature Radius R1: 38.40mm
Curvature Radius R2: 57.60mm
Center Thickness CT: 2.50mm
Edge Thickness ET: 1.60mm
Available Mount Ring: N/A
Design Wavelength: 10.6um
Diameter Tolerance: +0.0/-0.1mm
Center Thickness Tolerance: ±0.2mm
Focal Length Tolerance: ±1%
Centering Tolerance: ＜3 arcmin
Surface Quality: 40/20-60/40
Bevel: 0.2mmX45°

Germanium is an optical glass material commonly used in the infrared band. The transmission band is 2.0-16μm. It has the characteristics of high refractive index and high Knoop hardness. Germanium is inert to air, water, acid, alkali, etc., and can be used for thermal imaging and infrared imaging in harsh environments. It can be used as a substrate for a variety of optical components, such as lenses, windows, etc.

Meniscus Lenses, D=50.00mm, F=50.00mm, Uncoated Ge Single Crystal, United Optical Technology Co., Ltd (CAT#: STEM-OP-1999-YJL)
Meniscus Lenses, D=50.00mm, F=75.00mm, Uncoated Ge Single Crystal, United Optical Technology Co., Ltd (CAT#: STEM-OP-2000-YJL)
Meniscus Lenses, D=50.00mm, F=100.00mm, Uncoated Ge Single Crystal, United Optical Technology Co., Ltd (CAT#: STEM-OP-2001-YJL)
Meniscus Lenses, D=25.00mm, F=25.00mm, IR2 Ge Single Crystal, United Optical Technology Co., Ltd (CAT#: STEM-OP-2002-YJL)
Meniscus Lenses, D=25.00mm, F=30.00mm, IR2 Ge Single Crystal, United Optical Technology Co., Ltd (CAT#: STEM-OP-2003-YJL)
Meniscus Lenses, D=25.00mm, F=35.00mm, IR2 Ge Single Crystal, United Optical Technology Co., Ltd (CAT#: STEM-OP-2004-YJL)