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1 Micron Material Properties0 pages
Transmissive Materials for 1μm Optics
BK7
2.51
2.203
4.09
5.27
Poisson's Ratio
0.208
0.17
0.27
0.28
610
500
150-165
105-120
1.65E+08
5.00E+08
6.90E+08
Young's Modulus (dyne/cm^2)
8.2E+11
7.3E+11
7.45E+11
6.72E+11
7.1
0.55
6.5
7.57
Specific Heat (J/g/°C)
0.858
0.703
0.527
0.356
Thermal Conductivity (W/cm/°C)
0.0111
0.0138
0.272
0.18
Scatter Coefficient at 1.06 µm (/cm)
ND
ND
< 3%
< 0.5%
Scatter Coefficient at 0.6328 µm (/cm)
ND
ND
< 10%
< 3%
1.5066
1.4496
2.287
2.483
1.2
11
42
70
~ 0.001
~ 0.0001
< 0.0005
< 0.001
Plano/Convex Lens
0.07112
0.08994
0.02888
0.02849
Positive Meniscus Lens
0.06573
0.07792
0.02051
0.01758
Equi-Convex Lens
Optical
Properties
ZnSe
Rupture Modulus (dyne/cm^2)
Thermal
Properties
MS ZnS
Density (g/cm^3)
Mechanical
Properties
Fused Silica
0.10290
0.11542
0.05494
0.05164
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
dd =
Where:
dd ≡
ds ≡
λ
≡
M2 ≡
4⋅λ ⋅M 2⋅ f
π ⋅ d0
diffraction limited focused beam diameter
aberration limited focused beam diameter
wavelength of light
mode quality factor for the laser beam
Aberration Limited Equation
ds =
d0
f
k
3
4 ⋅ λ ⋅ M 2 ⋅ f k ⋅ d0
+ 2
π ⋅ d0
f
≡ beam diameter at the e-2 power points
≡ is the focal length of the lens
≡ is the aberration coefficient
.
5.50E+08
"
