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NOL crystal
optical crystal
Product Introduction
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Crystal Structure
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Monoclinic system, point group C2-2
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Unit Cell Parameters
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a = 7.116 Å, b = 4.993 Å, c = 6.508 Å, β = 105.62°, Z = 2
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Melting Point
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726 ℃
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Mohs Hardness
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5-5.5 Mohs
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Density
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5.033 g/cm3
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Coefficient of Thermal Expansion
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αa = 4.8×10-5 /K, αb = 4.4×10-6 /K, αc = -2.69×10-5 /K
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Transmission Band
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286-2500 nm
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Absorption Coefficient
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<0.1%/cm @ 1064 nm
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Physical Axis
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X∥b, (Z, a) = 31.6°, (Y, c) = 47.2°
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1064/532 nm
Second Harmonic Generation
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Phase Matching Angle
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An angle of 168.9° with the Z-axis, in the YZ plane
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Coefficient
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3.0±0.1 pm/V
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Acceptance Angle
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2.32 mard•cm
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Walk-off Angle
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25.6 mrad
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Temperature Bandwidth
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2.17 ℃•cm
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Sellmeier Coefficient
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n2i(λ) = A + B/(λ2 - C) - Dλ2(λ unit µm)
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A
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B
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C
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D
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n1
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3.6545(4)
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0.0511(2)
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0.0371(3)
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0.0226(1)
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n2
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3.0740(3)
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0.0323(1)
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0.0316(3)
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0.01337(6)
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n3
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3.1685(3)
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0.0373(1)
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0.0346(3)
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0.01750(8)
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| Size Tolerance |
(W±0.1 mm)×(H±0.1 mm)×(L+0.5/-0.1 mm) (L≥2.5 mm)
(W±0.1 mm)×(H±0.1 mm)×(L+0.1/-0.1 mm) (L<2.5 mm)
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| Effective Aperture | 90% of the central area |
| Surface Finish | 10/5, referring to MIL-PRF-13830B standard |
| Flatness | λ/8 @ 633 nm |
| Transmission Wavefront Distortion | λ/8 @ 633 nm |
| Parallelism | 20″ |
| Perpendicularity | ≤15′ |
| Angle Tolerance | Δθ≦0.25°, ΔФ≦0.25° |
| Edge Chipping | ≦0.1 mm |
| Chamfer | ≦0.2 mm×45° |
| Damage Threshold | >0.3 GW/cm2 @ 1064 nm, 10 ns, 10 Hz (Anti-reflection Coating) |
| Quality Assurance Period | One year (under normal use) |