The Front-Surface Beam Sampler is available as either a single prism (PFSA) or dual orthogonal prism (DPFSA) unit. Reflection of the prism at the nominal incidence of 45° is polarization and wavelength dependent, with 532 nm s-polarization reflected at 8.27%, and p-polarization at 0.68% for PFSA. The DPFSA configuration results in polarization independent reflection of 0.057% at 532 nm.
|Reflection at λ (nm)
Other filters and attenuators can be attached using the C-mount female threads at the input end. The use of a right-angle prism to sample the incident beam guarantees that any scattered secondary beams do not interfere with the measurement.