The PBS-2C Pellicle Beamsplitter is 74.9 mm in diameter with a 51.6 mm Clear Aperture in a 12.7 mm thick housing. This coated pellicle provide equal reflectance and transmission over the 375-2400 nm range by means of a neutral, semi-absorbing coating. The R/T curves below show average values, eliminating the often confusing sinusoidal oscillation due to interference. A ±5% wavelength dependent oscillation is superimposed on all curves. This pellicle has roughly a 50/50 split in transmission and reflectance in the visible wavelength range. Pellicle beamsplitters are ultra-lightweight components that virtually eliminate multiple reflections commonly associated with thicker glass beamsplitters. Pellicles are manufactured by stretching a 5 µm thick polymer membrane (index=1.47 @ 550 nm) over a flat metal frame. The extreme thinness eliminates secondary reflections by making them coincident with the original beam. Multiple wavelength versatility is an added benefit of an ultra-thin reflective membrane.


PBS-2C薄膜波束分离器直径74.9毫米，在12.7毫米厚的外壳上有51.6毫米的光圈。这种涂层薄膜通过中性的半吸收涂层提供了相同的反射率和在375-2400纳米范围内的传输。下面的R/T曲线显示了平均值，消除了由于干扰而产生的经常令人混淆的正弦振荡。±5%波长依赖振荡叠加曲线。这种薄膜在可见波长范围内的透射和反射率约为50/50。薄膜波束分离器是超轻量元件，几乎消除了多重反射通常与较厚的玻璃波束分离器。制造薄膜拉伸5µm厚聚合物膜(指数= 1.47 @ 550海里)在一个平坦的金属框架。这种极端的厚度通过使二次反射与原光束一致来消除二次反射。多波长通用性是超薄反射膜的额外优点。