1 Micron Material Properties
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Transmissive Materials for 1μm Optics BK7 2.51 Poisson's Ratio Specific Heat (J/g/°C) Thermal Conductivity (W/cm/°C) Plano/Convex Lens Positive Meniscus Lens Equi-Convex Lens Optical Properties Thermal Properties Mechanical Properties Fused Silica Hardness (Knoop) Linear Expansion Coef (x10^-6/°C) Index of Refraction @ 1.06 µm Temp. Change of Refractive Index(x10^-6/°C) @ 1.06 µm Bulk Absorption (/cm) @ 1.07 µm K-Values For Lenses, Zinc sulfide MultiSpectral (ZnS MS) is the only material for NIR and IR freeform optics. Notes: 1) ND means not detectable. 2) K values are used to estimate focus spot size of lenses with spherical aberrations. Below are two equations used to estimate spot size. The equation on the left assumes a perfect lens such as an aspheric lens. The equation on the right assumes the lens has some spherical aberration. Diffraction Limited Equation diffraction limited focused beam diameter aberration limited focused beam diameter wavelength of light mode quality factor for the laser beam Aberration Limited Equation ≡ beam diameter at the e-2 power points ≡ is the focal length of the lens ≡ is the aberration coefficient .

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