Double-Concave (DCV) Lenses, D=40.00mm, F=-40.00mm, VIS H-K9L Optical Glass, United Optical Technology Co., Ltd (CAT#: STEM-OP-1222-YJL)

Double-Concave (DCV) Lenses, D=40.00mm, F=-40.00mm, VIS H-K9L Optical Glass, model 130024, is manufactured by United Optical Technology Co., Ltd.
K9 Double Concave (DCV) Lenses are double concave lenses based on K9 glass.
K9 optical glass is an optical material with excellent wide-spectrum transmission. It has high transmittance from 350nm to 2000nm, has high hardness, and can withstand a variety of physical and chemical stimuli. The content of bubbles and impurities is low, so it is often used as the substrate for various optical components, such as lenses, windows, filters, beam splitters, reflectors, prisms, etc.

Diameter: 40.00mm
EFL: -40.00mm
Coating: AR@400~700nm
Material: H-K9L Optical Glass
BFL: -40.82mm
Curvature Radius R1: -41.74mm
Center Thickness CT: 2.50mm
Edge Thickness ET: 12.71mm
Available Mount Ring: 500010
Design Wavelength: 587.6nm
Diameter Tolerance: +0.0/-0.1
Center Thickness Tolerance: ±0.2
Surface Accuracy: λ/4@632.8nm
Focal Length Tolerance: ±2%
Centering Tolerance: 3 arcmin
Surface Quality: 40/20-60/40
Bevel: 0.2X45°
n: --

It will diverge the light and have a negative focal length. It is composed of two concave surfaces with equal curvature. It is often used for beam expansion, projection and expansion of the focal length of optical systems.

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