Beam Shaping Holographic Optical Element Production
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Solution Overview
Problem
The production of high-quality beam shaping holographic optical elements with improved steering ability is challenging due to the need for large and expensive optical components, such as mirrors and lenses, which are difficult to handle and align, especially for large-sized displays requiring high numerical apertures.
Innovation Solution
A method involving a recording stack with a master element and a recording element in close proximity, where a reconstruction beam and a reference beam are used to record a pattern onto the recording element, allowing for the production of beam shaping holographic optical elements with enhanced steering properties without the need for oversized optical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods using large mirrors and lenses are used to produce high-quality beam shaping holographic optical elements, then steering ability and display quality are improved, but device complexity, handling difficulty, and alignment difficulty increase significantly
Solution Approach 1:
The patent uses a master element that has already been recorded with the desired pattern to create a copy on the recording element. This copying approach eliminates the need for large mirrors and lenses, as the master element serves as a template that can be replicated at smaller scales while maintaining the steering quality and pattern accuracy of the original design
Solution Approach 2:
The patent divides the production process into two distinct stages: first recording the pattern on a master element, then using that master element to create the final beam shaping holographic optical element on a separate recording element. This segmentation allows each element to be optimized independently and simplifies the overall optical setup required
2Manufacturing precision
If large-sized optical components are used to achieve high numerical apertures for large displays, then beam shaping quality is improved, but handling and alignment become increasingly difficult
Solution Approach 1:
By copying the pattern from a master element to a recording element, the patent achieves high beam shaping quality without requiring large optical components. The master element captures the precise pattern needed for high-quality beam shaping, and this pattern is then replicated on the final element, maintaining quality while using smaller, more manageable components
Solution Approach 2:
The master element is prepared in advance with the exact pattern required for optimal beam shaping. This preliminary recording allows the complex optical work to be done once on the master element, and then the results are replicated on the final element, eliminating the need to handle and align large components during the actual beam shaping operation
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 results in beam shaping holographic optical elements that can reconstruct a real image of a diffuser independently of the light impact point, achieving improved steering ability and display quality while reducing the size and cost of required optical elements.
Implementation Method 1
At least a part of the recording stack with a reconstruction beam is irradiated. At least a part of the recording stack with a reference beam is irradiated. At least one of the reconstruction beam or reference beam penetrates the master element to record the pattern of the master element onto the recording element.
Implementation Method 2
The produced beam shaping holographic optical element is configured to illuminate a defined area at a defined distance from the beam shaping holographic optical element in a homogenous manner. The beam shaping holographic optical element can reconstruct a real image of a diffusor independently of the impact location of a pencil of light that hits the beam shaping holographic optical element.
Data Source
AI summary
The present disclosure relates to a method for producing a beam shaping holographic optical element, which is configured to generate diffracted beams configured to reconstruct an image of a diffusor irrespectively of the point of impact of a pencil of light on the beam shaping holographic optical element, comprising providing a recording element, providing a master element comprising a particular pattern, forming a recording stack comprising the recording element and the master element such that the master element is arranged to the recording element in a closed-copy distance, irradiating at least a part of the recording stack with a reconstruction beam, irradiating at least a part of the recording stack with a reference beam, wherein at least one of the reconstruction beam or reference beam penetrates the master element to record the pattern of the master element onto the recording element.