SINGLE-LENS OBJECTIVE WITH GRADIENT LAYER Russian patent published in 1996 - IPC

FIELD: optical devices with monochromatic light source. SUBSTANCE: device has single lens which uniform part is restricted by spherical or flat surface. Gradient layer is deposited on this lens by one layer at time. Axial distribution of refraction index n(z) of this layer is described by function n(z) n(z)=n_o+n₁z+n₂z²+ ...+n_kz^k, (1). Outer non-spherical surface which envelopes gradient layer is described by equation (2). Device may be used as collimator which operates with semiconductor laser or as objective for optical reading/writing device. EFFECT: increased functional capabilities. 3 cl, 3 dwg, 1 tbl