Reduction of the laser power before reaching the camera is often times required to obtain a usable signal, one that is not saturating or damaging the camera. These filters work much like sunglasses do, by absorbing the laser light and reducing the laser power often times by several orders of magnitude when used in series.
The individual filters come in three versions, the ND1 filter in the red housing with ~10% transmission in the visible, the ND2 filter in the black housing with ~1% transmission and the ND3 filter in the green housing with ~0.1% transmission. The individual filters can be screwed on top of each other and thus stacked and also can be combined with beam splitters. They are set at a small wedge angle in the housing so as not to cause interference effects.Show Product >