3 results about "Focal shift" patented technology

The present application relates to a kind of color holographic optical elements and its manufacturing method, manufacturing system and correction method, which can solve the problem of focal shift caused by wavelength inconsistency, help to improve the quality of reproduced image.The correction method of the color holographic optical element includes the following steps: adjusting the central ray incidence angle of various color recording light according to the wavelength of color recording light and the wavelength of color reproduction light, to correct the lateral focal shift of color holographic optical element in the process of image reproduction;And adjusting the edge ray incidence angle of various color recording light according to the wavelength of color recording light and the wavelength of color reproduction light, to correct the axial defocus of color holographic optical element in the process of image reproduction.

This invention relates to the field of laser ranging optics, and discloses an off-axis, focusless, multi-band adaptive laser emission system, comprising a multi-band laser, a folded-axis optical path assembly, an emitting negative lens assembly, an off-axis Reflective-C-Reflective Optical System, a laser beam splitter assembly, a monitoring camera assembly, and a back-reflection calibration assembly. The system employs an off-axis Reflective-C-Reflective Optical Structure, with an emitting negative lens positioned at the laser incident end, forming a focusless beam-expanding structure with the off-axis Reflective-C system, achieving laser beam expansion and beam divergence angle compression. The laser beam splitter structure allows the emitting and monitoring optical paths to share the same main optical system, and by adjusting the axial position of the emitting negative lens, it compensates for focal shifts in different bands and adjusts the beam divergence angle to adapt to laser ranging requirements for different target distances. This invention offers advantages such as unobstructed emission, multi-band compatibility, and adaptive beam divergence angle adjustment, improving long-distance laser transmission efficiency and ranging accuracy.

A hybrid lens assembly that corrects for chromatic aberrations and monochromatic aberrations in passing light. A plurality of refractive lens elements are provided that are fabricated from a common refractive material. The refractive lens elements are shaped and oriented to optically correct for monochromatic aberrations. A metalens is provided. The metalens optically corrects for the chromatic aberrations. The result is a hybrid lens assembly that contains both refractive lenses and a metalens. The result is an overall lens assembly that is apochromatic yet is smaller and easier to produce than assemblies that only use refractive lenses. The metalens also corrects for wavefront errors and focal shifts that result from using refractive lens of only one material type, therein making the use of only one refractive material practical in the manufacture of lens assemblies.