Holographic Optical Element Manufacturing with Fourier Lens Modulation
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Solution Overview
Problem
Current three-dimensional image display technologies, such as holograms, face challenges in effectively recording and reconstructing high-quality holographic images due to limitations in energy distribution and optical characteristics during the interference pattern recording process.
Innovation Solution
An apparatus that emits two laser beams to create distinct interference patterns on a hologram recording medium, using a beam splitter and optical systems with a Fourier lens to record and reconstruct holographic images, ensuring higher energy for modulated beams and satisfying Bragg's matching conditions for accurate reconstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single laser beam is used to record interference patterns on a hologram recording medium, then the manufacturing process is simple, but the holographic optical element cannot achieve varied optical characteristics for different wavelengths
Solution Approach 1:
The patent divides the recording process into multiple stages, using separate laser beams for different wavelengths (first laser beam for first wavelength, second laser beam for second wavelength). Each beam records a distinct interference pattern on the hologram recording medium, enabling the holographic optical element to achieve varied optical characteristics for different wavelengths without requiring a completely different apparatus for each wavelength.
2Manufacturing precision
If high energy is used during interference pattern recording, then the recording quality improves, but the hologram recording medium may be damaged or overexposed
Solution Approach 1:
The patent employs sequential recording with multiple laser beams of different wavelengths, where each beam records its interference pattern in a separate stage. This periodic action allows for controlled energy delivery to the hologram recording medium, ensuring high recording quality for each wavelength while preventing damage from excessive energy accumulation that would occur with continuous high-energy exposure.
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
This approach enables the creation of holographic optical elements with varied optical characteristics, allowing for improved reconstruction of three-dimensional images with enhanced depth perception and optical see-through augmented reality capabilities.
Implementation Method 1
a beam splitter configured to split the first laser beam into a first signal beam and a first reference beam, and split the second laser beam into a second signal beam and a second reference beam
Implementation Method 2
to record a first interference pattern of the first signal beam and the first reference beam on the hologram recording medium
Implementation Method 3
a second optical system comprising a Fourier lens and configured to emit a second signal beam modulated by the Fourier lens
Implementation Method 4
the holographic optical element reconstructs a holographic image by focusing the second standard beam in a space
Data Source
AI summary
An apparatus for manufacturing a hologram includes a holographic optical element on which a first interference pattern of a first signal beam and a first reference beam is recorded and a second interference pattern of a second signal beam modulated by a Fourier lens and a second reference beam is recorded. Also, an apparatus for reconstructing a hologram by using the holographic optical element is provided.