K9 Biconcave Lens

The k9 biconcave lenses have two concave surfaces, allowing light to focus and form clearer images. Used for optical applications that require highly precise focusing, such as microscopes, telescopes, etc. Having high transparency and low dispersion, it can provide clear and high-quality images. It also has good mechanical properties and stability, and can be used for a long time in various environments. UM OPTICS can provide a diameter of 2-300mm and a thickness of 0.12-60mm (accuracy can reach 20-10,1)/ 10L@633nm ）k9 biconcave lenses.

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Please leave a message or inquire about the price online to ensure a satisfactory price for you.

All products are provided with invoices, with a tax point of 13.

The product undergoes multiple inspections before being stored, and the quality is guaranteed. Please use it with confidence.

Spot products, shipped within 48 hours. For non stock or customized products, please consult.

International order logistics include DHL, FedEx, TNT, and EMS

When receiving the product, please ensure the integrity of the product packaging box first. If there is serious damage to the appearance, please refuse and contact us, and we will handle it for you as soon as possible.

Optical products are special items and cannot be returned or exchanged unless there is a quality issue with the product itself

If you need customization or bulk production, please contact us online and we will offer you a discounted price.

	Dia(mm)	Focal Length(mm)	Center Thickness(mm)	Edge Thickness(mm)	Design Wavelength(μm)	Radius of Curvature(mm)	Surface Quality
	Screen Reset 2-300	Screen Reset 15-5000	Screen Reset 0.12-60	Screen Reset 0.12-60	Screen Reset Custom	Screen Reset Custom	Screen Reset 60-40
More+ Less	2-300	15-5000	0.12-60	0.12-60	Custom	Custom	60-40
K9 Biconcave Lenses Number：PG206- Dia(mm)：2-300 Focal Length(mm)：15-5000 Center Thickness(mm)：0.12-60 Edge Thickness(mm)：0.12-60 Design Wavelength(μm)：Custom Radius of Curvature(mm)：Custom Surface Quality：60-40 Diameter Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Substrate Material：K9 Irregularity@632.8nm：λ/4 Centering：<3′ Clear Aperture：>90% Coating：Uncoated REACH：Compliant ROHS：Compliant

Material Data
Optical Properties
Transmission Range	0.35-2μm
Refractive Index	1.5168@587.5618nm 3×10-2@10.6μm
Reflection Loss	8.1%@587.5618nm(both sides)
Physical Properties
Density [g/cm3]	2.51
Melting Point [℃]	559
Thermal Conductivity [W/(m•deg C)]	1.114
Thermal Expansion [deg C-1for -30/+70 degC]	7.1*10-6
Specific Heat Capacity [J/(kg•deg C)]	0.858*103
Young's Modulus(E)[GPa]	82
Bulk Modulus(K)[GPa]	34
Poisson Coefficient	0.206
Chemical Properties
Solubility / g/L	None