MULTIPLE-BEAM INTERFERENCE DEVICE Russian patent published in 1997 - IPC

FIELD: optical instruments which use holography. SUBSTANCE: method involves usage of serial optical circuit in uniform medium which refraction index is n_o. Said circuit has point source which outputs linear- polarization laser beam of wavelength λ, optical element which refraction index is n and which has parallel spherical surfaces which have same curvature radiuses r₁-r₂=d. Convex region of both surfaces is directed towards light source. Space between spherical surfaces conforms to equation d = nr21

/(f(n-n_o)+nr₁),, where r₁ is curvature radius of greater surface, f is focal length. Interference pattern is projected on matrix of photo sensitive elements which is made from charge- coupled devices, period of photo sensitive elements is T. Beam receiver is not perpendicular to optical axis on which light source and optical element are located but is displaced from perpendicular to optical axis by angle of α = arcsin λ/T. EFFECT: increased functional capabilities. 3 cl, 2 dwg