LBP2 Beam Sampling System, 1064 nm

The LBP2-SAM-NIR2 beam sampler is designed so that the preferential polarization selection effect of a single wedge is cancelled out and the resulting beam image is polarization corrected to restore the polarization components of the original beam. The beam sampler operates by reflecting the incoming beam from the front surfaces of a pair of wedges through 90 degrees into the camera. Approximately 99% of the beam is transmitted through the beam sampler with 0.01% passed on to the camera. A set of adjustable ND filters, OD ranging from 0.3 to 4, are provided to make final intensity adjustments to the beam before it reaches the camera imager. Three adjustable ND filter holders are provided to make final intensity adjustments to the beam before it reaches the camera. Each holder has two filters, and two holders can be mounted in the beam sampler. Two beam samplers can be coupled in series providing up to a 10^-8 attenuation. It is advised to use this sampler for optical power ranging from 10 mW to ~400 Watts. Note that the ND filters can have a thermal lensing effect, causing deformation of the image at as low as 5 W/cm².