ADPを変調素子とする偏光測定

IV: レンズ波面収差計

抄録

Automatic recording lens interferometer has been built by applying photoelectric method of determining polarized light by means of ADP polarization modulators.
Optical arrangement of the apparatus is a modification of the wavefront shearing lens inter-ferometer proposed by M. Francon and M. Jordery.
A point source is placed on the focus of a test lens. Light emitted from the source is colli-mated by the test lens and the wavefront of the collimated beam is deformed from plane by the aberration inherent to the lens.
Small portion of the collimated beam collected through an opening is linearly polarized by a polarizer. The polarized beam is divided into two components and laterally displaced each other by a Savart's plate to produce small phase difference between them.
The phase difference is proportional to the inclination of wavefront of the beam and is deter-mined photoelectrically by the polarization modulating technique.
By scanning the collimated beam along a diameter of the test lens with the shearing polari-meter head, inclination of the wavefront at each point is determined and the derivative curve of the wavefront aberration of a lens is drawn.