The present disclosure describes optical element stack assemblies that include multiple substrates stacked one over another. At least one of the substrates includes an optical element, such as a DOE, on its surface. The stack assemblies can be fabricated, for example, in wafer-level processes.

A shape measurement device and a shape measurement method according to the present invention measure, for first and second distance measurement units which are disposed so as to be opposed to each other with a measurement object to be measured interposed therebetween and each measure a distance to the measurement object, first and second displacements of the first and second distance measurement units in an opposition direction, and obtain, as a shape of the measurement object, a thickness of the measurement object in the opposition direction, the thickness being corrected with the measured first and second displacements, based on first and second distance measurement results measured by the first and second distance measurement units, respectively.

A structured light generator includes a light source configured to emit light, and a first meta optical device including a first metasurface including nanostructures having sub-wavelength dimensions that are less than a wavelength of the light emitted from the light source, the first metasurface being configured to form a distribution of light rays from the light emitted from the light source to thereby radiate structured light.

A calibration apparatus according to the present invention includes: a first acquisition unit configured to acquire a first measurement value, which is a measurement value of light from a screen of a display apparatus; a second acquisition unit configured to acquire a second measurement value, which is a measurement value of external light to the display apparatus; an allowable range determination unit configured to determine an allowable range of the first measurement value based on the second measurement value acquired by the second acquisition unit; and a measurement value determination unit configured to determine whether the first measurement value acquired by the first acquisition unit is a value within the allowable range determined by the allowable range determination unit.

A signal processing apparatus that calculates a phase distribution for reproducing a target light intensity distribution on a projection plane by performing spatial light phase modulation on incident light is provided. The calculation process is performed so as to satisfy “Condition 1.” “Condition 1” specifies that the calculation process include a nonlinear ray-optics model including a nonlinear term, and an inverse calculation model obtained by linearizing the nonlinear ray-optics model, determine an error distribution between the target light intensity distribution and a calculated light intensity distribution, obtain a light intensity correction value by multiplying the error distribution by a feedback gain, input the light intensity correction value to the inverse calculation model to obtain an output, regard the obtained output as a phase correction value, and use a feedback loop of repeatedly updating the phase distribution by adding the phase correction value to the provisional value.

The present invention relates to a natural light homogenization lighting device, and particularly relates to a natural light homogenization lighting device based on combination of biconvex lenses and semi-transparent lenses. The present invention aims to solve the problems of low efficiency and poor lighting uniformity of light pipes, and possible damage to the original building structure in the process of installation and not conducive to the promotion and popularization of the existing solar energy conversion devices. The device of the present invention includes a positive lens combination and a positive half-lens combination; the positive lens combination and the positive half-lens combination are arranged side by side, the positive lens combination is located outdoors, and the positive half-lens combination is located indoors. The present invention belongs to the technical field of lighting systems.

A structured light generator includes a light source configured to emit light, and a first meta optical device including a first metasurface including nanostructures having sub-wavelength dimensions that are less than a wavelength of the light emitted from the light source, the first metasurface being configured to form a distribution of light rays from the light emitted from the light source to thereby radiate structured light.

The present disclosure describes optical element stack assemblies that include multiple substrates stacked one over another. At least one of the substrates includes an optical element, such as a DOE, on its surface. The stack assemblies can be fabricated, for example, in wafer-level processes.

A structured light generator includes a light source configured to emit light, and a first meta optical device including a first metasurface including nanostructures having sub-wavelength dimensions that are less than a wavelength of the light emitted from the light source, the first metasurface being configured to form a distribution of light rays from the light emitted from the light source to thereby radiate structured light.

A structured light generator includes a light source configured to emit light, and a first meta optical device including a first metasurface including nanostructures having sub-wavelength dimensions that are less than a wavelength of the light emitted from the light source, the first metasurface being configured to form a distribution of light rays from the light emitted from the light source to thereby radiate structured light.