The FS-3 Absorptive Neutral Density Filter Set is a set of nine 2 x 2 inch (50.8 x 50.8 mm) square absorptive neutral density filters with assorted Optical Densities providing broadband attenuation for the visible to near-infrared region. These filters are precision polished for demanding research or OEM applications. Each filter's Optical Density is permanently marked on the filter and is shipped with a transmission curve. Our unique assortment of filters permits easy selection of any desired density from 0 to 8 with 0.1 OD resolution by using individual filters or a combination of no more than two filters. The total filter set range is 0 to 8 OD. Optical density (OD) is defined by the relationship: OD = -log(T) or T = 10-OD, where T is transmission (0=T=1). The density of a series of filters, unlike transmission, is additive. Custom densities can therefore be obtained by stacking filters, however stacking an excessive number of filters can lead to numerous unwanted back reflections. Due to the absorptive nature of the filter glass, use with high power lasers should be avoided. Power levels less than 30 W/cm2 are advised. This set includes the following ND filters and a wood case: (2) FSQ-OD05, FSQ-OD20, FSQ-OD40, FSQ-OD60, FSQ-OD80, FSQ-OD100, FSQ-OD200, and FSQ-OD300.

FS-3吸收中性密度滤光片是一套9个2×2英寸(50.8×50.8 mm)方形吸收中性密度滤光片，具有不同的光学密度，为可见光到近红外区域提供宽带衰减。这些过滤器经过精密抛光，以满足研究或OEM应用的要求。每个过滤器的光密度被永久地标记在过滤器上，并随传输曲线一起发送。我们独特的过滤器种类允许使用单个过滤器或不超过两个过滤器的组合，以方便地选择任何所需的密度从0到8和0.1 OD分辨率。总的过滤集范围是0到8 OD。光密度(OD)定义为:OD = -log(T)或T= 10-OD，其中T为传输(0=T=1)。与传输不同的是，一系列过滤器的密度是附加的。因此，可以通过叠加滤波器获得自定义密度，但是叠加过多的滤波器会导致许多不必要的反射。由于过滤玻璃的吸收特性，应避免与大功率激光器一起使用。建议功率级别小于30 W/cm2。本系列包括以下ND滤波器和一个木箱:(2)FSQ-OD05、FSQ-OD20、FSQ-OD40、FSQ-OD60、FSQ-OD80、FSQ-OD100、FSQ-OD200、FSQ-OD300。