Optical glass Double-Concave Lenses
Optical glass used in a variety of visible and short-wave infrared applications, and its advantages over other similar glasses are mainly reflected in the following aspects: high performance, low cost, good material consistency, high homogeneity of refractive index, low stress birefringence, low bubbles and streakiness.
Optical glass double concave lens is similar to a plano-concave lens in that the focal length is negative, but the light incident in parallel diverges outward.It’s been widely applied for visible and short-wave infrared applications, such as optical systems for beam expansion, image formation, beam collimation, focus collimation, beam collimation point source, and other applications.
Our Company can provide optical glass double-concave Lenses with diameters from 2-300mm and thicknesses from 0.12-60mm (accuracy up to 20-10, 1/10L@633nm),coating AR, BBAR, AF or upon request.
Technical parameters of optical glass Double-Concave Lens
Diameter | 2-300mm |
Focal length | 15-5000mm |
Thicknesses | 0.12-60mm |
Dimension tolerance | +0/-0.1mm |
Thickness tolerance | ±0.1mm |
Surface quality (scratch & dig) | 60-40, 40-20, or better |
Surface accuracy | λ/2, λ/4 or better |
Parallelism | 3' ,30'' |
Bevel | 0.1~0.3mm x 45 degree |
Clear aperture | >85%,>90% |
Coating | AR coating or cutom |
Material properties of optical glass
Optical Properties | |
Transmission Range | 0.35-2μm |
Refractive index | 1.5168@587.5618nm |
3×10-2@10.6μm | |
Reflection loss | 8.1%@587.5618nm |
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 |
Transmission curve
Optical glass is widely used in a variety of visible and short-wave infrared applications.
