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金屬線柵偏振立方體分光鏡專為使用非平行光 (例如採用寬頻白光源) 的應用而設計。金屬線柵偏振立方體分光鏡包含金屬線柵偏光片，該偏光片黏合在兩個精密高容差直角稜鏡之間。分光鏡的每個面已鍍抗反射膜，以實現每個表面的平均反射率低於0.5%。此外，這些分光鏡可在400 - 700nm的光譜範圍以及±25°的大錐形角範圍內保持對比度。
| Contrast (typical) | |||||
| Wavelength | Incident Cone of Light | ||||
| ±5° | ±10° | ±15° | ±20° | ±25° | |
| 400 - 500nm | 2,100:1 | 2,000:1 | 1,600:1 | 1,400:1 | 1,100:1 |
| 500 - 600nm | 4,000:1 | 3,900:1 | 2,900:1 | 2,600:1 | 1,900:1 |
| 600 - 700nm | 6,000:1 | 5,500:1 | 4,200:1 | 3,800:1 | 2,500:1 |
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