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Standard Tolerances

For Flat BK-7 & Fused Silica

 Flat Optics Specifications Commercial Quality Precision Quality Laser Grade Quality Manufacturing Limit
 Surface Figure Accuracy, PTV @ 633nm
3 waves/25mm  1 wave  λ/4 λ/20
 Surface Roughness, Angstroms RMS  -  <5  <4  <2
 Cosmetic QUALITY, Scratch-Dig  -  40-20  20-10  5-1
 Center Thickness Tolerance (mm)  ±0.2  ±0.1  ±0.025  +0.0/-0.025
 Parallelism  -  3'  30''  2"
 Diameter Accuracy (mm)  ±0.2  ±0.1  ±0.025  +0.0/-0.025
 Transmitted Wavefront  -  1 wave  λ/4  λ/20

 

For Flat IR Materials

 Flat Optics Specifications

Commericial Quality

Precision Quality Laser Grade Quality Manufacturing Limit
 Surface Figure Accuracy, PTV @ 633nm  3 waves/25mm  1 wave  λ/2  λ/10
 Surface Roughness, Angstroms RMS -  <7  <5  <3
 Cosmetic QUALITY, Scratch-Dig -  60-40  40-20  20-10
 Center Thickness Tolerance (mm)  ±0.2  ±0.15  ±0.1  +0.0/-0.1
 Parallelism  -  3'  1'  5"
 Diameter Accuracy (mm)  ±0.2  ±0.15  ±0.1  +0.0/-0.1
 Transmitted Wavefront/Power Cancellation  -  2 waves  1 wave  λ/5

 All specs contingent upon size, aspect ratio & other factors that may require exception/deviation from the above standards.

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