Specifications:
| Lens Shape | Plano-convex, Plano-concave, Double convex/concave, Ball/Half-ball, Meniscus lenses |
Materials | Optical grade single crystal sapphire |
| Aperture | >90% | Diameter Tolerance | +0.0/-0.2mm |
| Thickness Tolerance | +/-0.2mm | Centering Error | 3 arc minutes |
| Surface Quality | Option: 60/40, 40/20 or 20/10 S/D | Parallelism | 1 arc minute |
| Coating | According to customer’s requirement |
Basic Properties:
| Physical and Optical Properties | |||
| Transmission Range | 0.15 to 5.5 μm | Refractive Index | No 1.75449; Ne 1.74663 @ 1.06 μm (1) |
| Reflection Loss | 14% at 1.06 μm | Absorption Coefficient | 0.3 x 10-3cm-1 @ 2.4 μm (2) |
| Reststrahlen Peak | 13.5 μm | dn/dT | 13.1 x 10-6 @ 0.546 μm (3) |
| dn/dμ = 0 | 1.5 μm | Density | 3.97 g/cc |
| Melting Point | 2040°C | Thermal Conductivity | 27.21 W m-1 K-1 @ 300K |
| Thermal Expansion | 5.6 (para) & 5.0 (perp) x 10-6 /K * | Hardness | Knoop 2000 with 2000g indenter |
| Specific Heat Capacity | 763 J Kg-1 K-1 @ 293K (4) | Dielectric Constant | 11.5 (para) 9.4 (perp) @ 1MHz |
| Youngs Modulus (E) | 335 GPa | Shear Modulus (G) | 148.1 GPa |
| Bulk Modulus (K) | 240 GPa | Elastic Coefficients | C11=496 C12=164 C13=115 C33=498 C44=148 |
| Apparent Elastic Limit | 300 MPa (45,000 psi) | Poisson Ratio | 0.25 |
| Solubility | 98 x 10-6 g/100g water | Molecular Weight | 101.96 |
| Class/Structure | Trigonal (hex), R3c | ||
Lenses are optical components utilized for focusing or diverging light. Sapphire Lenses are ideal for demanding applications (such as lasers) and harsh environments because of their extreme surface hardness, high thermal conduction, high dielectric constants, and resistance to common chemical acids and alkalis. Sapphire (Al2O3) is the second hardest crystal next to diamond, and because of their structural strength, sapphire crystal lenses can be made much thinner than other common materials. Sapphire has decent transmission rates from 0.15 to 5.5μm, which covers the ultraviolet (UV) to mid-wave infrared (MWIR) wavelength range.
Hangzhou Shalom EO offers Custom Sapphire Lenses upon the customer's request, and lenses with anti-reflection and other thin film coatings are available. The precision, focal length, lens shape (ball/half ball, plano-convex/concave, double-concave, meniscus, etc.), and other specifications of the sapphire lens can be tailored upon request. The kinds of sapphire we offer include Random, C-cut (also known as Z-cut), or other custom orientations. Our sapphire lenses are excellent for incorporation into various multi-spectral and Infrared optical and laser facilities.
