Holographic Optical Element Dispersion Compensation

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Solution Overview

Problem

Optical devices face chromatic aberrations due to dispersion, which degrade image quality, and existing methods are inadequate for effectively mitigating these effects.

Innovation Solution

The implementation of holographic optical elements that use dispersion relationships to determine and compensate for chromatic dispersion by calculating and adjusting hologram grating vectors, ensuring achromatic performance across various wavelengths, thereby minimizing color separation and residual aberrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional optical elements are used, then the optical device can reflect light, but chromatic aberrations occur due to dispersion causing color separation and degraded image quality

Engineering Contradiction:

Improveoptical reflection capabilityVSAvoidchromatic aberrations

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent modifies the grating vector parameters of the holographic optical element to compensate for dispersion effects. By adjusting the grating vector based on wavelength-specific calculations, the device achieves achromatic reflection across multiple wavelengths, eliminating color separation while maintaining manufacturing feasibility

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention employs a composite approach by integrating a holographic grating structure within the optical element. This composite design combines the light-reflection capability of conventional mirrors with the wavelength-selective properties of holographic gratings, enabling dispersion compensation while maintaining optical functionality

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If holographic optical elements are designed for specific wavelengths, then chromatic aberrations are reduced, but the device complexity increases due to multiple hologram grating vectors

Engineering Contradiction:

Improvechromatic aberrationsVSAvoidhologram grating vector calculations

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent performs preliminary dispersion compensation calculations during the hologram design phase. By pre-calculating the required grating vector adjustments for different wavelengths and embedding these corrections into the hologram structure, the device achieves achromatic performance without requiring complex real-time adjustments or additional optical components

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention creates a universal holographic optical element that can handle multiple wavelengths simultaneously through a single integrated grating structure. The dispersion-compensated grating vector design enables the element to function across a broad spectral range, eliminating the need for multiple separate holograms or wavelength-specific components

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Object-affected harmful factors

If dispersion compensation is applied across broad spectral ranges, then achromatic performance is achieved, but the precision of hologram grating vector determination increases the manufacturing difficulty

Engineering Contradiction:

Improvecolor separationVSAvoidhologram grating vector accuracy

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The patent applies dispersion compensation selectively to the most critical wavelength ranges and grating vector components that have the greatest impact on color separation. By focusing compensation efforts on the dominant dispersion effects rather than attempting perfect correction across all parameters, the device achieves practical achromatic performance with manageable manufacturing tolerances

Inventive Principle:

Principle #16Partial or excessive action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution effectively eliminates chromatic aberrations and residual optical aberrations, providing a substantially achromatic reflection that improves image quality and optical clarity in optical devices.

Implementation Method 1

A holographic optical element may be substantially achromatic, sustaining a reflective angle independent of the wavelength of incident light

Methodology Applied

Scientific EffectDiffraction: Diffraction

Implementation Method 2

Light traversing certain dispersion boundaries (e.g., air-to-projection coupling element, air-to-waveguide substrate, air-to-waveguide grating medium) of the optical device may be exhibit waveform separation across disparate frequencies of the light

Methodology Applied

Scientific EffectDispersion: Dispersion (of waves)

Data Source

PatentUS11782266B2Dispersion compensation

Publication Date: 2023.10.10 AKONIA HOLOGRAPHICS LLC

AI summary

A method of dispersion compensation in an optical device is disclosed. The method may include identifying a first hologram grating vector of a grating medium of the optical device. The first hologram grating vector may correspond to a first wavelength of light. The method may include determining a probe hologram grating vector corresponding to a second wavelength of light different from the first wavelength of light. The method may also include determining a dispersion-compensated second hologram grating vector based at least in part on the probe hologram grating vector and the first hologram grating vector. A device for reflecting light is disclosed. The device may include a grating medium and a grating structure within the grating medium. The grating medium may include a dispersion compensated hologram.