The LBS-300s beam splitter attachment for C-mount, CS-mount, or Ophir mount cameras (P/N SP90466) is designed for 950 nm to 1800 nm. It allows measuring laser beams with diameters up to 15mm and powers ranging from 10mW to ~400W⁽¹⁾. The beam sampler is designed so that the preferential polarization selection effect of a single wedge is canceled 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 are provided to make final intensity adjustments to the beam before it reaches the camera imager. If additional attenuation is needed, an external wedge may be mounted at the input port, however, this 3rd wedge will cause polarization selectivity when the beam is significantly polarized differently in the S and P planes. A 1.035-40 thread is provided behind each wedge along the axis of the output beam that can be used to directly mount accessories with 1” lens tubes such as beam dumps or even power and energy sensors to the LBS-300s.

⁽¹⁾For Gaussian beam diameter <1/2 the clear aperture and depending on ND filter and camera saturation limits the maximum power may be as high as 1000W.