An image pickup optical system of the present invention includes, in order from the object side to the image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, an aperture stop, and a third lens unit, and the second lens unit moves during focusing. The first lens unit consists of, in order from the object side to the image side, a first lens sub-unit having a positive refractive power, a second lens sub-unit having a negative refractive power, and a third lens sub-unit having a positive refractive power, and the focal length of the second lens sub-unit and the focal length of the image pickup optical system are appropriately set.

A method for assessing the similarity between a power profile of a manufactured optic device and a nominal power profile upon which the power profile of the manufactured optic device is based. The method comprises measuring the power profile of manufactured optic device, identifying a region of interest from the measured power profile of manufactured optic device, and applying an offset to the measured power profile to substantially minimize a statistical quantifier for quantifying the similarity between the nominal power profile and the offset measured power profile. The method further comprises comparing the offset and the statistical quantifier to predefined quality control metrics, determining whether the measured power profile meets the predefined quality control metrics based, at least in part on the comparison. In exemplary embodiments, the method may further comprise determining whether to associate the manufactured optic device with another nominal power profile, if the measured power profile does not meet the predefined quality control metrics.

Disclosed is a method for correcting an image, a storage medium, and a projection device. The method is applied to a projection device, the projection device including a grating and a light generation component. The method includes: determining, in a region in which a projection image projected by the projection device overlaps with a projected image projected through the grating by detection light output from the projection device, diffraction spots having a diameter not equal to a preset value as target diffraction spots; determining a group of target diffraction spots continuously arranged in a horizontal or vertical direction, as well as diffraction spots having a diameter equal to the preset value that are respectively located on both sides of the group of target diffraction spots, as a region to be corrected; determining an angle .sub.i between a plane of an i.sup.th diffraction spot and a plane of an (i+1).sup.th diffraction spot that are adjacent in the horizontal or vertical direction in the region to be corrected; and determining a corrected projection length of the (i+1).sup.th diffraction spot according to the preset value and angles .sub.1 to .sub.i.

A near eye display includes a main freeform prism lens and a micro-display corrector lens, where the main freeform prism lens includes a first freeform surface, a second freeform surface, and a third freeform surface, the first freeform surface refracting a light from a micro-display into a body of the main freeform prism lens, and the main freeform prism lens having an exit pupil diameter greater than 12 millimeter (mm), and a lateral color aberration of less than 4 micrometer (um)) across a diagonal field of view (FOV), where the micro-display corrector lens is positioned between the main freeform prism lens and the micro-display, the micro-display corrector lens including a first corrector lens surface and a second corrector lens surface, and each surface of the main freeform prism lens and the micro-display corrector lens comprises a surface sag.

Techniques for creating a replacement for optical elements with diffractive planar components based on metasurfaces are provided. In one example, a substantially flat optical component for lensing incoming electromagnetic radiation having at least one wavelength and a first phase into outgoing electromagnetic radiation having a second phase is provided.

A display device of the present disclosure includes an optical system, the optical system including an image light generation device configured to generate image light, a projection optical system including an optical element, the optical element including an optical surface asymmetric in a direction along at least a first axis of two axes orthogonal to each other and perpendicular to an optical axis of the image light, a support member configured to support the optical element, a first adjustment mechanism configured to adjust a position of the optical element in the direction along the first axis, and a second adjustment mechanism configured to adjust a position of an emission region of the image light in the direction along the first axis.

Various embodiments provide for the implementation of volumetric diffractive optics equivalent functionality via cascaded planar elements. To illustrate the principle, a design 3D diffractive optics and implement a two-layer continuous phase-only design on a single spatial light modulator (SLM) with a folded system. The system provides dynamic and efficient multiplexing capability. Numerical and experimental results show this approach improves system performance such as diffraction efficiency, spatial/spectral selectivity, and number of multiplexing functions relative to 2D devices while providing dynamic large space-bandwidth relative to current static volume diffractive optics. The limitations and capabilities of dynamic 3D diffractive optics are discussed.

An optical system includes a first lens unit having positive refractive power, a second lens unit having positive refractive power that is moved during focusing, and a third lens unit having negative refractive power that are arranged in order from an object side to an image side. A distance between adjacent lens units on an optical axis of the optical system is varied during focusing. The first lens unit consists of a diffractive optical element and a negative lens that are arranged in order from the object side to the image side. The negative lens has a meniscus shape in which a concave surface faces the object side.

An optical hybrid lens comprises a substrate having a first surface and a second surface opposite the first surface. A sub-wavelength grating lens is disposed on the first surface and comprises a plurality of posts. The plurality of posts is arranged on the first surface and the posts extend from the first surface. A refractive lens is arranged on the sub-wavelength grating lens at least partly enclosing the plurality of posts. Alternatively, the refractive lens is arranged on the second surface.

An optical processor is presented for applying optical processing to a light field passing through a predetermined imaging lens unit. The optical processor comprises a pattern in the form of spaced apart regions of different optical properties. The pattern is configured to define a phase coder, and a dispersion profile coder. The phase coder affects profiles of Through Focus Modulation Transfer Function (TFMTF) for different wavelength components of the light field in accordance with a predetermined profile of an extended depth of focusing to be obtained by the imaging lens unit. The dispersion profile coder is configured in accordance with the imaging lens unit and the predetermined profile of the extended depth of focusing to provide a predetermined overlapping between said TFMTF profiles within said predetermined profile of the extended depth of focusing.