APPARATUS FOR CEMENTING DOUBLET LENSES

A technique for aligning doublet and triplet lenses is described. The first lens is fixed to the apparatus by means of a vacuum pump and ali gned using an interferogram produced by the reflected beams from the f ront and back lens surfaces. To obtain a measurement of the residual d ecentering of the doublet or triplet lens, the present technique utili zes the displacement of a reference beam that is produced after passin g twice through the lens. The precision of the measurements can be sui tably modified by changing the setup parameters. (C) 1996 Society of P hoto-Optical instrumentation Engineers.