The ir dichroic mirror , augmented by colour filters that perfected their colour-selective action, directed a blue image to the first tube, a green image to the second, and a red image to the surface.
Specification of Dichroic Mirror
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Material
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BK7 or Fused Silica
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Design Wavelength
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546.1 nm
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BK7
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1.5183 ± 0.0005
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Fused Silica
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1.46008±0.00005
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Diameter Tolerance
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+0.00, -0.15 mm
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Thickness Tolerance
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±0.2 mm
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Paraxial Focal Length
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±2%
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Centration
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<3 arc minutes
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Clear Aperture
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>85%
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Surface Irregularity
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λ/4@632.8 nm
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Surface Quality
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60-40 scratch and dig
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Protective Bevel
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0.25 mm x 45°
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