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 Density | Nominal Transmission(%) | Transmission Deviation From Nominal(%) | ||
| 250-350nm | 350-800nm | 800-2000nm | ||
| 0.10 0.15 0.20 | 79.5 70.8 63.0 | ±9.0 ±8.0 ±6.0 | ±3.0 ±3.0 ±2.0 | ±9.0 ±8.0 ±6.0 |
| 0.30 0.40 0.50 | 50.0 39.1 31.6 | ±5.0 ±4.0 ±4.0 | ±2.0 ±1.5 ±1.5 | ±5.0 ±4.0 ±4.0 |
| 0.60 0.70 0.80 | 25.0 20.0 15.5 | ±4.0 ±4.0 ±4.0 | ±1.5 ±1.5 ±1.5 | ±4.0 ±4.0 ±4.0 |
| 0.90 1.00 1.30 | 12.6 10.0 5.0 | ±3.5 ±3.5 ±3.0 | ±1.0 ±1.0 ±1.0 | ±3.5 ±3.5 ±3.0 |
| 1.50 2.00 2.50 | 3.2 1.0 0.32 | ±1.5 ±0.5 ±0.15 | ±0.5 ±0.2 ±0.07 | ±1.5 ±0.5 ±0.15 |
| 3.00 4.00 | 0.10 0.01 | ±0.06 ±0.008 | ±0.05 +0.01/-0.008 | ±0.1(nominal) ±0.01(nominal) |
| 1.5 OD, 3.2% transmission, 50.0 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 150FN46-50 |
| %T (Optical Density) | 3.2 (1.5 OD) |
| Substrate Material | Fused Silica |
| Size | 50.0 mm diameter |
| Thickness | 1.50 +0.5/-0.5 mm |
| 1.5 OD, 3.2% transmission, 50.0 x 50.0mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 150FN46-50S |
| %T (Optical Density) | 3.2 (1.5 OD) |
| Substrate Material | Fused Silica |
| Size | 50.0 x 50.0 mm square |
| Thickness | 1.50 +0.5/-0.5 mm |
| 2.0 OD, 1.00% transmission, 12.5 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 200FN46-12.5 |
| %T (Optical Density) | 1.00 (2.0 OD) |
| Substrate Material | Fused Silica |
| Size | 12.5 mm diameter |
| Thickness | 1.50 +0.5/-0.5 mm |
| 2.0 OD, 1.00% transmission, 25.0 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 200FN46-25 |
| %T (Optical Density) | 1.00 (2.0 OD) |
| Substrate Material | Fused Silica |
| Size | 25.0 mm diameter |
| Thickness | 1.50 +0.5/-0.5 mm |
| 2.0 OD, 1.00% transmission, 50.0 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 200FN46-50 |
| %T (Optical Density) | 1.00 (2.0 OD) |
| Substrate Material | Fused Silica |
| Size | 50.0 mm diameter |
| Thickness | 1.50 +0.5/-0.5 mm |
| 2.0 OD, 1.00% transmission, 50.0 x 50.0mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 200FN46-50S |
| %T (Optical Density) | 1.00 (2.0 OD) |
| Substrate Material | Fused Silica |
| Size | 50.0 x 50.0 mm square |
| Thickness | 1.50 +0.5/-0.5 mm |
| 2.5 OD, 0.32% transmission, 12.5 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 250FN46-12.5 |
| %T (Optical Density) | 0.32 (2.5 OD) |
| Substrate Material | Fused Silica |
| Size | 12.5 mm diameter |
| Thickness | 1.50 +0.5/-0.5 mm |
| 2.5 OD, 0.32% transmission, 25.0 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 250FN46-25 |
| %T (Optical Density) | 0.32 (2.5 OD) |
| Substrate Material | Fused Silica |
| Size | 25.0 mm diameter |
| Thickness | 1.50 +0.5/-0.5 mm |
| 2.5 OD, 0.32% transmission, 50.0 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 250FN46-50 |
| %T (Optical Density) | 0.32 (2.5 OD) |
| Substrate Material | Fused Silica |
| Size | 50.0 mm diameter |
| Thickness | 1.50 +0.5/-0.5 mm |
| 2.5 OD, 0.32% transmission, 50.0 x 50.0mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 250FN46-50S |
| %T (Optical Density) | 0.32 (2.5 OD) |
| Substrate Material | Fused Silica |
| Size | 50.0 x 50.0 mm square |
| Thickness | 1.50 +0.5/-0.5 mm |
| 3.0 OD, 0.10% transmission, 12.5 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 300FN46-12.5 |
| %T (Optical Density) | 0.10 (3.0 OD) |
| Substrate Material | Fused Silica |
| Size | 12.5 mm diameter |
| Thickness | 1.50 +0.5/-0.5 mm |
| 3.0 OD, 0.10% transmission, 25.0 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 300FN46-25 |
| %T (Optical Density) | 0.10 (3.0 OD) |
| Substrate Material | Fused Silica |
| Size | 25.0 mm diameter |
| Thickness | 1.50 +0.5/-0.5 mm |
| 3.0 OD, 0.10% transmission, 50.0 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 300FN46-50 |
| %T (Optical Density) | 0.10 (3.0 OD) |
| Substrate Material | Fused Silica |
| Size | 50.0 mm diameter |
| Thickness | 1.50 +0.5/-0.5 mm |
| 3.0 OD, 0.10% transmission, 50.0 x 50.0mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 300FN46-50S |
| %T (Optical Density) | 0.10 (3.0 OD) |
| Substrate Material | Fused Silica |
| Size | 50.0 x 50.0 mm square |
| Thickness | 1.50 +0.5/-0.5 mm |
| 4.0 OD, 0.01% transmission, 12.5 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 400FN46-12.5 |
| %T (Optical Density) | 0.01 (4.0 OD) |
| Substrate Material | Fused Silica |
| Size | 12.5 mm diameter |
| Thickness | 1.50 +0.5/-0.5 mm |
| 4.0 OD, 0.01% transmission, 25.0 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 400FN46-25 |
| %T (Optical Density) | 0.01 (4.0 OD) |
| Substrate Material | Fused Silica |
| Size | 25.0 mm diameter |
| Thickness | 1.50 +0.5/-0.5 mm |
| 4.0 OD, 0.01% transmission, 50.0 mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 400FN46-50 |
| %T (Optical Density) | 0.01 (4.0 OD) |
| Substrate Material | Fused Silica |
| Size | 50.0 mm diameter |
| Thickness | 1.50 +0.5/-0.5 mm |
| 4.0 OD, 0.01% transmission, 50.0 x 50.0mm Unmounted, Metallic Neutral Density Filter | |
| PART NO. | 400FN46-50S |
| %T (Optical Density) | 0.01 (4.0 OD) |
| Substrate Material | Fused Silica |
| Size | 50.0 x 50.0 mm square |
| Thickness | 1.50 +0.5/-0.5 mm |
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