An optical system having a grating lens assembly including a first grating lens which diffracts rays of a beam incident thereupon so as to provide non-parallel diffraction rays and a second grating lens which converges the non-parallel diffraction rays at a predetermined point substantially without ...http://www.google.fr/patents/US4832464?utm_source=gb-gplus-shareBrevet US4832464 - Optical system with grating lens assembly for correcting wavelength aberrations
Optical system with grating lens assembly for correcting wavelength aberrations
