中性密度（ND）濾波器可用于許多應(yīng)用，例如用于寬帶光譜源的衰減器，用于光平衡應(yīng)用的部分反射器以及用作中性分束器。金屬型中性密度濾光器通過(guò)將金屬合金涂層沉積到特定類型的基板上來(lái)獲得其光密度，該基板由感興趣的波長(zhǎng)區(qū)域確定。使用Schott NG玻璃生產(chǎn)吸收ND濾光片，并嚴(yán)格依賴玻璃的吸收效果來(lái)獲得所需的衰減水平。
光密度（OD）定義為透射輻射功率（T）的倒數(shù)的基數(shù)10的對(duì)數(shù)：
Metallic Neutral Density Specifications
| Optical | Nominal | Transmission Deviation From Nominal(%) | ||
| Density | Transmission(%) | 250-350nm | 350-800nm | 800-2000nm |
| 0.1 | 79.5 | ±9.0 | ±3.0 | ±9.0 |
| 0.15 | 70.8 | ±8.0 | ±3.0 | ±8.0 |
| 0.2 | 63 | ±6.0 | ±2.0 | ±6.0 |
| 0.3 | 50 | ±5.0 | ±2.0 | ±5.0 |
| 0.4 | 39.1 | ±4.0 | ±1.5 | ±4.0 |
| 0.5 | 31.6 | ±4.0 | ±1.5 | ±4.0 |
| 0.6 | 25 | ±4.0 | ±1.5 | ±4.0 |
| 0.7 | 20 | ±4.0 | ±1.5 | ±4.0 |
| 0.8 | 15.5 | ±4.0 | ±1.5 | ±4.0 |
| 0.9 | 12.6 | ±3.5 | ±1.0 | ±3.5 |
| 1 | 10 | ±3.5 | ±1.0 | ±3.5 |
| 1.3 | 5 | ±3.0 | ±1.0 | ±3.0 |
| 1.5 | 3.2 | ±1.5 | ±0.5 | ±1.5 |
| 2 | 1 | ±0.5 | ±0.2 | ±0.5 |
| 2.5 | 0.32 | ±0.15 | ±0.07 | ±0.15 |
| 3 | 0.1 | ±0.06 | ±0.05 | ±0.1(nominal) |
| 4 | 0.01 | ±0.008 | -1.25 | ±0.01(nominal) |
| 1.50 OD, 3.16% transmission, 25.0 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 150FN52-25 |
| %T (Optical Density) | 3.16 () |
| Substrate Material | Green Glass |
| Size | 25.0 mm diameter |
| Thickness | 1.52 +0.5/-0.5 mm |
| 1.50 OD, 3.16% transmission, 50.0 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 150FN52-50 |
| %T (Optical Density) | 3.16 () |
| Substrate Material | Green Glass |
| Size | 50.0 mm diameter |
| Thickness | 1.52 +0.5/-0.5 mm |
| 1.50 OD, 3.16% transmission, 50.0 x 50.0mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 150FN52-50S |
| %T (Optical Density) | 3.16 () |
| Substrate Material | Green Glass |
| Size | 50.0 x 50.0 mm square |
| Thickness | 1.52 +0.5/-0.5 mm |
| 2.00 OD, 1.00% transmission, 12.5 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 200FN52-12.5 |
| %T (Optical Density) | 1.00 () |
| Substrate Material | Green Glass |
| Size | 12.5 mm diameter |
| Thickness | 1.52 +0.5/-0.5 mm |
| 2.00 OD, 1.00% transmission, 25.0 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 200FN52-25 |
| %T (Optical Density) | 1.00 () |
| Substrate Material | Green Glass |
| Size | 25.0 mm diameter |
| Thickness | 1.52 +0.5/-0.5 mm |
| 2.00 OD, 1.00% transmission, 50.0 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 200FN52-50 |
| %T (Optical Density) | 1.00 () |
| Substrate Material | Green Glass |
| Size | 50.0 mm diameter |
| Thickness | 1.52 +0.5/-0.5 mm |
| 2.00 OD, 1.00% transmission, 50.0 x 50.0mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 200FN52-50S |
| %T (Optical Density) | 1.00 () |
| Substrate Material | Green Glass |
| Size | 50.0 x 50.0 mm square |
| Thickness | 1.52 +0.5/-0.5 mm |
| 2.50 OD, 0.32% transmission, 12.5 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 250FN52-12.5 |
| %T (Optical Density) | 0.32 () |
| Substrate Material | Green Glass |
| Size | 12.5 mm diameter |
| Thickness | 1.52 +0.5/-0.5 mm |
| 2.50 OD, 0.32% transmission, 25.0 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 250FN52-25 |
| %T (Optical Density) | 0.32 () |
| Substrate Material | Green Glass |
| Size | 25.0 mm diameter |
| Thickness | 1.52 +0.5/-0.5 mm |
| 2.50 OD, 0.32% transmission, 50.0 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 250FN52-50 |
| %T (Optical Density) | 0.32 () |
| Substrate Material | Green Glass |
| Size | 50.0 mm diameter |
| Thickness | 1.52 +0.5/-0.5 mm |
| 2.50 OD, 0.32% transmission, 50.0 x 50.0mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 250FN52-50S |
| %T (Optical Density) | 0.32 () |
| Substrate Material | Green Glass |
| Size | 50.0 x 50.0 mm square |
| Thickness | 1.52 +0.5/-0.5 mm |
| 3.00 OD, 0.10% transmission, 12.5 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 300FN52-12.5 |
| %T (Optical Density) | 0.10 () |
| Substrate Material | Green Glass |
| Size | 12.5 mm diameter |
| Thickness | 1.52 +0.5/-0.5 mm |
| 3.00 OD, 0.10% transmission, 25.0 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 300FN52-25 |
| %T (Optical Density) | 0.10 () |
| Substrate Material | Green Glass |
| Size | 25.0 mm diameter |
| Thickness | 1.52 +0.5/-0.5 mm |
| 3.00 OD, 0.10% transmission, 50.0 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 300FN52-50 |
| %T (Optical Density) | 0.10 () |
| Substrate Material | Green Glass |
| Size | 50.0 mm diameter |
| Thickness | 1.52 +0.5/-0.5 mm |
| 3.00 OD, 0.10% transmission, 50.0 x 50.0mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 300FN52-50S |
| %T (Optical Density) | 0.10 () |
| Substrate Material | Green Glass |
| Size | 50.0 x 50.0 mm square |
| Thickness | 1.52 +0.5/-0.5 mm |
| 4.00 OD, 0.01% transmission, 12.5 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 400FN52-12.5 |
| %T (Optical Density) | 0.01 () |
| Substrate Material | Green Glass |
| Size | 12.5 mm diameter |
| Thickness | 1.52 +0.5/-0.5 mm |
| 4.00 OD, 0.01% transmission, 25.0 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 400FN52-25 |
| %T (Optical Density) | 0.01 () |
| Substrate Material | Green Glass |
| Size | 25.0 mm diameter |
| Thickness | 1.52 +0.5/-0.5 mm |
| 4.00 OD, 0.01% transmission, 50.0 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 400FN52-50 |
| %T (Optical Density) | 0.01 () |
| Substrate Material | Green Glass |
| Size | 50.0 mm diameter |
| Thickness | 1.52 +0.5/-0.5 mm |
| 4.00 OD, 0.01% transmission, 50.0 x 50.0mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 400FN52-50S |
| %T (Optical Density) | 0.01 () |
| Substrate Material | Green Glass |
| Size | 50.0 x 50.0 mm square |
| Thickness | 1.52 +0.5/-0.5 mm |
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