Precision optical flats are Fused Silica optical components that are used as a reference against which the flatness of an unknown surface can be determined. For less demanding jobs Tower offers them made from BK7 with a flatness specified as λ/4 or better. These optical flats may also be used as windows.
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| Single Sided and Double Sided Optical Flats |
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| For Single and Dual Surface Optical Flats | ||
| Material: | BK7 | Fused Silica |
| Ref Index: | nd-1.517 | nd=1.458 |
| Abbe Number: | vd=64.07 | vd=67.7 |
| Density: | 2.53 g/cm3 | 2.2 g/cm3 |
| Exp. Coefficient: | 7.1 × 10-6/°C | 0.55 × 10-6/°C |
| Surface Quality: | 60/40 | |
| Parallelism: | <1 arc min | |
| Back Surface (Single): | 1-2 λ @633nm | |
| Dia. Tolerance: | ±1mm | |
| Thickness Tolerance: | ±1.5mm | |
| Diameter (mm) | Thickness (mm) | Material | Single or Dual Surface | Lambda/10 | Lambda/20 | ||
| Catlog No. | Price | Catlog No. | Price | ||||
| 25 | 12.5 | Fused Sillica | Single | 4542-0002 | $140.00 | 4542-0022 | Call for price |
| 25 | 12.5 | Fused Sillica | Dual | 4542-0004 | $240.00 | ||
| 50 | 15 | Fused Sillica | Single | 4542-0006 | $400.00 | 4542-0024 | Call for price |
| 50 | 15 | Fused Sillica | Dual | 4542-0008 | $520.00 | ||
| 100 | 20 | Fused Sillica | Single | 4542-0010 | $680.00 | 4542-0026 | Call for price |
| 100 | 20 | Fused Sillica | Dual | 4542-0012 | $860.00 | ||
| 150 | 25 | Fused Sillica | Single | 4542-0014 | $1,447.00 | ||
| 150 | 25 | Fused Sillica | Dual | 4542-0016 | $1,630.00 | ||
| 200 | 38 | Fused Sillica | Single | 4542-0018 | $2,872.00 | ||
| 200 | 38 | Fused Sillica | Dual | 4542-0020 | $3,052.00 | ||
| Lambda/4 or better | |||||||
| 25 | 12.5 | BK7 | Single | 4542-0001 | $75.00 | ||
| 25 | 12.5 | BK7 | Dual | 4542-0003 | $83.00 | ||
| 50 | 15 | BK7 | Single | 4542-0005 | $75.00 | ||
| 50 | 15 | BK7 | Dual | 4542-0007 | $100.00 | ||
| 100 | 20 | BK7 | Single | 4542-0009 | $215.00 | ||
| 100 | 20 | BK7 | Dual | 4542-0011 | $300.00 | ||
| 150 | 25 | BK7 | Single | 4542-0013 | $450.00 | ||
| 150 | 25 | BK7 | Dual | 4542-0015 | $580.00 | ||
| 200 | 38 | BK7 | Single | 4542-0017 | $1,350 | ||
| 200 | 38 | BK7 | Dual | 4542-0019 | $1,600 | ||
If a carrying case is required order 1405-0008 for up to 100mm for $50.00, and 1405-0009 for 150 & 200mm for $75.00
We make custom versions of everything on this site. Send us your drawings or specifications and we will provide a quotation.