PURPOSE: To reproduce a hologram consisting of modulated equal-interval linear interference fringes with high precision by using two plane waves.
CONSTITUTION: The plane wave for reproduction and the conjugate plane wave which is conjugate to it are made incident on the hologram H consisting of the equal-interval linear interference fringes which are modulated with a recording wave front and the diffracted reproduction wave front and conjugate wave front are made to interfere with each other, thereby optically reproducing the hologram H. In this case, the plane wave for reproduction and the conjugate plane wave are generated with symmetrical diffracted light beams of (±1)th order generated by a linear diffraction grating 1. Light of unnecessary diffraction order from the diffraction grating 1 is removed by a spatial filter 7 and light other than the reproduction wave front and conjugate wave front from the hologram H is removed by a spatial filter 10.
CHIN GUN
ISHIZUKA KAZUO
TONOMURA AKIRA
TONOMURA AKIRA