Open Access
Table 1
Etalon and Dualon specifications.
| Etalon | Dualon | |
|---|---|---|
| Manufacturer | LightMachinery | |
| Absolute thickness | 26.308 mm | 26.308 mm |
| Side length | 25.36 mm | 25.4 mm |
| Dualon mismatch | n/a | 135.0 nm |
| Int. surface reflectivity | n/a | 93.89–94.66% |
| Ext. surfaces reflectivity | 72.5% | 63.1% |
| Coating | 750–780 nm | 750–780 nm |
| Edge square to mirrors | 2.9′ | <5′ |
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