Lithium Fluoride Plano-Concave Lens PLi04-
Lithium fluoride plano-concave lens is composed of a plane and a concave spherical surface, which can generate negative spherical aberration, and is used for beam expansion or increasing focal length to balance the deviation of other lenses. Lithium fluoride crystal is one of the infrared materials with a transmission spectrum range of 120nm-7000nm, used for lenses, prisms, and windows in thermal imaging, aerospace optics, and laser optical systems. The water solubility is high and the coefficient of thermal expansion is large. When using it, it is necessary to prevent its deliquescence and deformation. UM OPTICS can provide lithium fluoride flat concave lenses with a diameter of 2-150mm and a thickness of 0.12-60mm.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Dia | 2-150 mm |
| Focal Length | 15-5000 mm |
| Center Thickness | 0.12-60 mm |
| Edge Thickness | 0.12-60 mm |
| Design Wavelength | Custom |
| Radius of Curvature | Custom |
| Surface Quality | 60-40 |
| Diameter Tolerance | +0.0/-0.1 |
| Thk Tolerance | ±0.1 mm |
| Substrate Material | Lithium Fluoride（LiF） |
| PV [@632.8nm] | λ/4 |
| Centering | <3′ |
| Coating | Uncoated |
| Clear Aperture | >90% |
| REACH | Compliant |
| ROHS | Compliant |
| Transmission Range [Substrate Material：Lithium Fluoride（LiF）] | 0.11-7μm |
| Transmittance [Substrate Material：Lithium Fluoride（LiF）；@0.6μm] | >94.8%@0.6μm |
| Reflection Loss [Substrate Material：Lithium Fluoride（LiF）；@0.6μm(both surfaces)] | 5.2%@0.6μm(both surfaces) |
| Absorption Coefficienet [Substrate Material：Lithium Fluoride（LiF）；@4.3μm] | 5.9×10⁻³@4.3μm |
| Structure [Substrate Material：Lithium Fluoride（LiF）] | Cubic Crystal System |
| Cleavage Planes [Substrate Material：Lithium Fluoride（LiF）] | <100> |
| Density [Substrate Material：Lithium Fluoride（LiF）] | 2.639 g/cm³ |
| Melting Point [Substrate Material：Lithium Fluoride（LiF）] | 848 ℃ |
| Thermal Conductivity [Substrate Material：Lithium Fluoride（LiF）；@314K] | 11.3 @ 314K |
| Thermal Expansion [Substrate Material：Lithium Fluoride（LiF）；@283K] | 37.0 @ 283K |
| Knoop Hardness [Substrate Material：Lithium Fluoride（LiF）] | 415 kg/mm² |
| Specific Heat Capacity [Substrate Material：Lithium Fluoride（LiF）] | 1562 J/(kg×K) |
| Dielectric Constant [Substrate Material：Lithium Fluoride（LiF）；@1 MHz] | 7.33 @ 1 MHz |
| Young's Modulus (E) [Substrate Material：Lithium Fluoride（LiF）] | 64.79 GPa |
| Shear Modulus(G) [Substrate Material：Lithium Fluoride（LiF）] | 55.14 GPa |
| Bulk Modulus(K) [Substrate Material：Lithium Fluoride（LiF）] | 62.03 GPa |
| Poisson Coefficient [Substrate Material：Lithium Fluoride（LiF）] | 0.22 |
| Solubility [Substrate Material：Lithium Fluoride（LiF）；@20℃] | 2.7g @ 20℃ |
| Molecular Weight [Substrate Material：Lithium Fluoride（LiF）] | 25.9394 g/mol |
Applications
Datasheet
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