Pre-compensation method for optimizing recording process of holographic optical element lenses with spherical wave reconstruction

Abstract

We propose a pre-compensated recording process of holographic optical element (HOE) lenses, where both of reference and signal waves have spherical wavefronts, for solving a wavelength mismatch problem between the recording and displaying process. Based on a localized approximation for aperiodic volume gratings, the wavelength mismatch and shrinkage effects are pre-compensated by optimizing the recording setup of HOE lenses, so that the Bragg condition of each local grating is satisfied. In order to realize the practical implementations of recording setup, complicated wavefronts to be required for the wavelength and shrinkage compensation are approximated into spherical waves. The simulation results using the volume hologram models of OpticStudio verify that the undesirable focal shift and color breakup problems in the HOE lens due to the wavelength mismatch are compensated. Displaying experiments using a full-color HOE lens with the field of view of 30° are presented, where the maximum wavelength mismatch between the recording and displaying process is 17 nm.

Dual-View and Multi-Content Head-Up Display Using a Single Picture Generation Unit and Two-Layer Volume Holographic Grating

“…Theoretical calculations show that blue has the most efficiency loss compared to red and green. Based on the coupled wave theory, the effects of wavelength shift and material shrinkage can be improved by pre-compensating the recording angle, which means that the Bragg condition is still satisfied when the reconstructed wavelength is inconsistent with the recording wavelength, thereby reducing the loss of diffraction efficiency [27]. In addition, the holographic multiplexing of the grating in this paper will further lead to the reduction of diffraction efficiency.…”

Recent Applications of Optical Elements in Augmented and Virtual Reality Displays: A Review

“…The chromatic aberration of the eyepiece lens PPHOE was partially corrected by another PPHOE, and monochromatic aberrations caused by the off-axis scheme were corrected with the freeform optics. A precompensation method of the chromatic aberration of the PPHOE recorded with only spherical waves, and the shrinkage effects during the curing and baking process was also reported . In Figure c, the mechanical flexibility of the PPHOE and its application to the curved surface was exploited .…”

“…A precompensation method of the chromatic aberration of the PPHOE recorded with only spherical waves, and the shrinkage effects during the curing and baking process was also reported. 61 In Figure 4c, the mechanical flexibility of the PPHOE and its application to the curved surface was exploited. 62 They successfully analyzed the aberrations, astigmatism, and diffraction efficiency of the bendable lens PPHOE using the coupled wave theory and the numerical ray tracing simulations.…”

Design and application of diffractive optical element: a review

“…This method was used to analyze the effect of surface curvature on HOE aberration and diffraction efficiency, and a method for designing the optimal curvature to reduce aberration was proposed. To correct HOE aberrations and expand its application scenarios, Jang et al [45] proposed a method for designing, optimizing, and manufacturing complex customized HOEs. This method adopts the optimization method of grating vector field to reduce image aberration, optimize the diffraction efficiency of required wavelength and angle, and compensate for the aberration caused by material shrinkage during the HOE manufacturing process.…”