Device to convert raw laser beam into expanding spherical wavefronts; filtering action performed by small pinhole in metal wafer removing spurious light from focused light beam; supplied w/a 25 micro pinhole and a 10x microscope objective; has three 1/4 in. Clearance holes on 1/2 in. Centers in line w/optical axis to attach to platforms, bases and posts; each micrometer has 1/2 in. Travel
