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Asahi Spectra 高性能滤光片，多种类可选
日本Asahi Spectra始创于1970年，于日本东京成立。因其在离子辅助沉积 (IAD) 和离子束溅射 (IBS) 等真空沉积技术等技术的多年深造，使其具备了硬镀膜、对环境（湿度、低温或高温、热冲击或真空）的出色耐久性和光谱稳定性的出色能力。
日本Asahi Spectra的主营产品分滤光片和光源仪器两大类。而其中，日本Asahi进口滤波片，以其高性能，成本性价比高著称。在滤波片的类型上主要分有短通滤光片，长通滤光片，带通滤光片，中性灰度镜（又称为中灰密度镜或者中性密度滤波片），超冷滤波片。其工作波段囊亏常用UV紫外波段，VIS可见光波段和IR红外波段。滤波片的材质以熔石英为主，尺寸分为两种：φ25mm的圆片，50*50mm的方片，镜片的厚度均为1mm。
Asahi带通滤光片：
带通滤光片通常用于传输明确范围的光谱波段，同时抑制比传输波段的长的波长和更短的短波长侧。 日本Asahi Spectra的涂层设计基于多腔谐振器。 因此，其带通滤光片在窄通 10nm 波段之外具有非常陡峭的斜率和非常高的衰减。
| 中心波长 | FWHM | 可选尺寸1 | 可选尺寸12 | 中心波长 | FWHM | 可选尺寸1 | 可选尺寸2 |
| 254nm | 10nm | φ25mm | 50*50mm | 560 nm | 10nm | φ25mm | 50*50mm |
| 260 nm | 10nm | φ25mm | 50*50mm | 570 nm | 10nm | φ25mm | 50*50mm |
| 270 nm | 10nm | φ25mm | 50*50mm | 580 nm | 10nm | φ25mm | 50*50mm |
| 280 nm | 10nm | φ25mm | 50*50mm | 590 nm | 10nm | φ25mm | 50*50mm |
| 290 nm | 10nm | φ25mm | 50*50mm | 600 nm | 10nm | φ25mm | 50*50mm |
| 300 nm | 10nm | φ25mm | 50*50mm | 610 nm | 10nm | φ25mm | 50*50mm |
| 310 nm | 10nm | φ25mm | 50*50mm | 620 nm | 10nm | φ25mm | 50*50mm |
| 313 nm | 10nm | φ25mm | 50*50mm | 630 nm | 10nm | φ25mm | 50*50mm |
| 320 nm | 10nm | φ25mm | 50*50mm | 640 nm | 10nm | φ25mm | 50*50mm |
| 330 nm | 10nm | φ25mm | 50*50mm | 650 nm | 10nm | φ25mm | 50*50mm |
| 334 nm | 10nm | φ25mm | 50*50mm | 660 nm | 10nm | φ25mm | 50*50mm |
| 340 nm | 10nm | φ25mm | 50*50mm | 670 nm | 10nm | φ25mm | 50*50mm |
| 350 nm | 10nm | φ25mm | 50*50mm | 680 nm | 10nm | φ25mm | 50*50mm |
| 360 nm | 10nm | φ25mm | 50*50mm | 690 nm | 10nm | φ25mm | 50*50mm |
| 365 nm | 10nm | φ25mm | 50*50mm | 700 nm | 10nm | φ25mm | 50*50mm |
| 370 nm | 10nm | φ25mm | 50*50mm | 710 nm | 10nm | φ25mm | 50*50mm |
| 380 nm | 10nm | φ25mm | 50*50mm | 720 nm | 10nm | φ25mm | 50*50mm |
| 390 nm | 10nm | φ25mm | 50*50mm | 730 nm | 10nm | φ25mm | 50*50mm |
| 400 nm | 10nm | φ25mm | 50*50mm | 740 nm | 10nm | φ25mm | 50*50mm |
| 405 nm | 10nm | φ25mm | 50*50mm | 750 nm | 10nm | φ25mm | 50*50mm |
| 410 nm | 10nm | φ25mm | 50*50mm | 760 nm | 10nm | φ25mm | 50*50mm |
| 420 nm | 10nm | φ25mm | 50*50mm | 770 nm | 10nm | φ25mm | 50*50mm |
| 430 nm | 10nm | φ25mm | 50*50mm | 780 | 10nm | φ25mm | 50*50mm |
| 436 nm | 10nm | φ25mm | 50*50mm | 790 nm | 10nm | φ25mm | 50*50mm |
| 440 nm | 10nm | φ25mm | 50*50mm | 800 nm | 10nm | φ25mm | 50*50mm |
| 450 nm | 10nm | φ25mm | 50*50mm | 810 nm | 10nm | φ25mm | 50*50mm |
| 460 nm | 10nm | φ25mm | 50*50mm | 820 nm | 10nm | φ25mm | 50*50mm |
| 470 nm | 10nm | φ25mm | 50*50mm | 830 nm | 10nm | φ25mm | 50*50mm |
| 480 nm | 10nm | φ25mm | 50*50mm | 840 nm | 10nm | φ25mm | 50*50mm |
| 490 nm | 10nm | φ25mm | 50*50mm | 850 nm | 10nm | φ25mm | 50*50mm |
| 500 nm | 10nm | φ25mm | 50*50mm | 870 nm | 10nm | φ25mm | 50*50mm |
| 510 nm | 10nm | φ25mm | 50*50mm | 880 nm | 10nm | φ25mm | 50*50mm |
| 520 nm | 10nm | φ25mm | 50*50mm | 890 nm | 10nm | φ25mm | 50*50mm |
| 530 nm | 10nm | φ25mm | 50*50mm | 900 nm | 10nm | φ25mm | 50*50mm |
| 540 nm | 10nm | φ25mm | 50*50mm | 550 nm | 10nm | φ25mm | 50*50mm |
Asahi短通滤光片：
日本Asahi进口滤波片的短通滤光片通常用于隔离范围光谱区域。 Asahi滤光片的作用是在波段上传输比截止波长短的波长的能量，并阻挡比截止波长更长的波长的能量透射。此外，通过与长通滤波片一起使用，短通滤光片可用于自定义带通滤波。 Asahi Spectra 提供多种波长范围广的短通滤光片：紫外线、可见光或红外线波长。
| 截断波长 | 厚度 | 可选尺寸1 | 可选尺寸12 | 截断波长 | 厚度 | 可选尺寸1 | 可选尺寸2 |
| 265 nm | 1mm | φ25mm | 50*50mm | 550 nm | 1mm | φ25mm | 50*50mm |
| 300 nm | 1mm | φ25mm | 50*50mm | 570 nm | 1mm | φ25mm | 50*50mm |
| 310 nm | 1mm | φ25mm | 50*50mm | 590 nm | 1mm | φ25mm | 50*50mm |
| 325 nm | 1mm | φ25mm | 50*50mm | 610 nm | 1mm | φ25mm | 50*50mm |
| 350 nm | 1mm | φ25mm | 50*50mm | 630 nm | 1mm | φ25mm | 50*50mm |
| 385 nm | 1mm | φ25mm | 50*50mm | 650 nm | 1mm | φ25mm | 50*50mm |
| 400 nm | 1mm | φ25mm | 50*50mm | 670 nm | 1mm | φ25mm | 50*50mm |
| 425 nm | 1mm | φ25mm | 50*50mm | 690 nm | 1mm | φ25mm | 50*50mm |
| 430 nm | 1mm | φ25mm | 50*50mm | 710 nm | 1mm | φ25mm | 50*50mm |
| 450 nm | 1mm | φ25mm | 50*50mm | 730 nm | 1mm | φ25mm | 50*50mm |
| 470 nm | 1mm | φ25mm | 50*50mm | 750 nm | 1mm | φ25mm | 50*50mm |
| 490 nm | 1mm | φ25mm | 50*50mm | 780 nm | 1mm | φ25mm | 50*50mm |
| 510 nm | 1mm | φ25mm | 50*50mm | 810 nm | 1mm | φ25mm | 50*50mm |
| 530 nm | 1mm | φ25mm | 50*50mm | 840 nm | 1mm | φ25mm | 50*50mm |
| 840 nm | 1mm | φ25mm | 50*50mm | 930 nm | 1mm | φ25mm | 50*50mm |
| 870 nm | 1mm | φ25mm | 50*50mm | 960 nm | 1mm | φ25mm | 50*50mm |
| 900 nm | 1mm | φ25mm | 50*50mm | 990 nm | 1mm | φ25mm | 50*50mm |
Asahi长通滤光片：
与短通滤光片类似，长通滤光片主要用于截止波长比截止波长更短的成分通过。
| 截断波长 | 厚度 | 可选尺寸1 | 可选尺寸12 | 截断波长 | 厚度 | 可选尺寸1 | 可选尺寸2 |
| 250 nm | 1mm | φ25mm | 50*50mm | 610 nm | 1mm | φ25mm | 50*50mm |
| 275 nm | 1mm | φ25mm | 50*50mm | 630 nm | 1mm | φ25mm | 50*50mm |
| 300 nm | 1mm | φ25mm | 50*50mm | 650 nm | 1mm | φ25mm | 50*50mm |
| 325 nm | 1mm | φ25mm | 50*50mm | 670 nm | 1mm | φ25mm | 50*50mm |
| 350 nm | 1mm | φ25mm | 50*50mm | 690 nm | 1mm | φ25mm | 50*50mm |
| 385 nm | 1mm | φ25mm | 50*50mm | 710 nm | 1mm | φ25mm | 50*50mm |
| 400 nm | 1mm | φ25mm | 50*50mm | 730 nm | 1mm | φ25mm | 50*50mm |
| 422 nm | 1mm | φ25mm | 50*50mm | 750 nm | 1mm | φ25mm | 50*50mm |
| 430 nm | 1mm | φ25mm | 50*50mm | 780 nm | 1mm | φ25mm | 50*50mm |
| 450 nm | 1mm | φ25mm | 50*50mm | 810 nm | 1mm | φ25mm | 50*50mm |
| 470 nm | 1mm | φ25mm | 50*50mm | 840 nm | 1mm | φ25mm | 50*50mm |
| 490 nm | 1mm | φ25mm | 50*50mm | 870 nm | 1mm | φ25mm | 50*50mm |
| 510 nm | 1mm | φ25mm | 50*50mm | 900 nm | 1mm | φ25mm | 50*50mm |
| 530 nm | 1mm | φ25mm | 50*50mm | 930 nm | 1mm | φ25mm | 50*50mm |
| 55 nm | 1mm | φ25mm | 50*50mm | 960 nm | 1mm | φ25mm | 50*50mm |
| 570 nm | 1mm | φ25mm | 50*50mm | 990 nm | 1mm | φ25mm | 50*50mm |
| 590 nm | 1mm | φ25mm | 50*50mm |
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Asahi中性密度滤波片
中性密度滤光片（又称中性灰度滤波片或者中灰密度镜）是反射型 ND 滤光片，用于控制光强度。 镀铬层主要通过反射和部分吸收来衰减光。 Asahi的 ND 滤光片旨在保持光谱均匀性能，尤其是在可见光范围内，而不会改变能量的相对光谱分布。 共有6种衰减率可供选择。
| 描述 | 透过率% | 可选尺寸1 | 可选尺寸2 |
| Neutral Density Filter / 1% | 1 | φ25mm | 50*50mm |
| Neutral Density Filter / 3% | 3 | φ25mm | 50*50mm |
| Neutral Density Filter / 6% | 6 | φ25mm | 50*50mm |
| Neutral Density Filter / 12% | 12 | φ25mm | 50*50mm |
| Neutral Density Filter / 25% | 25 | φ25mm | 50*50mm |
| Neutral Density Filter / 50% | 50 | φ25mm | 50*50mm |
Asahi超冷滤波片：
超冷滤波片是热反射型，比传统的吸热型具有更好的性能。 即使使用高功率光源，也不会损坏基板，因为它是反射型的，由熔融石英制成。 VIS透射型（750nm截止）和VIS-NIR透射型（1050nm截止）可供选择。
| 描述 | 截止波长 | 厚度 | 可选尺寸1 | 可选尺寸2 |
| Super Cold Filter / 750nm | 750 nm | 5mm | φ50mm | 50*50mm |
| Super Cold Filter / 1100nm | 1100 nm | 5mm | φ50mm | 50*50mm |
