VLT 4LGSF OTA aspherical L2 lens

VLT 4LGSF OTA aspherical L2 lens The high wavefront quality and focus of the OTA is maintained thanks to a 380 mm diameter aspherical collimator lens. TNO has been developing freeform optics related technologies for more than years. Aspheres and freeforms are now used in many space, astronomy and semicon instruments, including the the OTA L2 lenses. The lens was polished at TNO's optical manufacturing facility, using a polishing robot. Key is the iterative loop between the manufacturing (deterministic polishing or diamond turning) and the absolute metrology of the NANOMEFOS machine. This allows for rapid and efficient manufacturing, since no dedicated measurement setup has to be made. All equipment is capable of handling optics ranging from flat to freeform and from convex to concave, up to 500 mm diameter. Link: www.tno.nl/vlt4lgsf