Holographic Imaging With Cube-Type Beam Splitter Refraction Compensation
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Solution Overview
Problem
Conventional holography techniques using cube-type beam splitters do not adequately consider the refractive index of the beam splitter, leading to issues such as multiple reflections and quality deterioration due to vibrations, which affect the performance of holographic imaging devices.
Innovation Solution
A holographic imaging device and method that utilizes a cube-type beam splitter to electronically acquire and reconstruct images by considering the refractive index of the beam coupler, generating complex amplitude inline holograms and inline reference light holograms through light wave propagation calculations, thereby improving image accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a plate-type or pellicle-type beam splitter is used to overlap reference light and object light, then the optical system design becomes easier and reference light source can be placed away from object, but multiple reflected lights overlap the object light causing recording quality deterioration
Solution Approach 1:
The patent extracts the beam splitting function from plate-type or pellicle-type beam splitters and implements it using a cube-type beam splitter. This removes the source of multiple reflections while maintaining the ability to overlap reference light and object light, thus resolving the contradiction between ease of design and recording quality.
Solution Approach 2:
The cube-type beam splitter serves as an intermediary component that divides and directs light paths without generating multiple reflections. It mediates between the reference light source and object light in a way that avoids the harmful multiple reflections inherent in plate-type beam splitters.
2Object-generated harmful factors
If a pellicle type beam splitter is used to suppress multiple reflected lights, then multiple reflections are reduced, but hologram quality deteriorates due to vibration of the pellicle
Solution Approach 1:
The patent removes the pellicle-type beam splitter from the system and replaces it with a cube-type beam splitter. This extraction eliminates both multiple reflections and vibration-induced quality deterioration, as the cube-type structure is mechanically stable and does not suffer from the same vulnerabilities.
Solution Approach 2:
The cube-type beam splitter serves as a more durable and stable alternative to the fragile pellicle-type beam splitter. While not literally disposable, it provides long-term stability without the vibration issues that plague pellicle-based systems.
3Object-generated harmful factors
If a cube-type beam splitter is used as beam coupler, then multiple reflections are avoided, but refractive index effects are not adequately considered leading to imaging accuracy issues
Solution Approach 1:
The patent incorporates the refractive index parameter of the cube-type beam splitter into the hologram processing algorithm. By adjusting for this physical parameter, the system compensates for refraction effects and maintains high imaging accuracy while retaining the advantages of the cube-type beam splitter.
4Device complexity
If conventional holography without refractive index consideration is used, then device complexity is reduced, but imaging accuracy deteriorates due to unaccounted refraction effects
Solution Approach 1:
The patent introduces the refractive index parameter into the holographic processing algorithm, transforming the system from a simplified model to one that accounts for physical realities. This parameter change enables accurate image reconstruction while maintaining relatively simple optical hardware.
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 method enhances the accuracy of holographic imaging by effectively accounting for the refractive index of the cube-type beam splitter, reducing multiple reflections and vibrations, resulting in high-quality image reconstruction.
Implementation Method 1
the influence of the refractive index of a cube-type beam splitter forming an optical system
Implementation Method 2
multiple reflected lights generated in the plate overlap the object light
Implementation Method 3
data of light intensity and phase are recorded together, on a recording medium such as a photographic plate called a hologram
Implementation Method 4
holography by which data of light intensity and phase are recorded together
Implementation Method 5
the interference pattern of the object light and the reference light is recorded
Data Source
AI summary
The present invention provides a holographic imaging device and a holographic imaging method that have improved performance in which the influence of a refractive index of a cube-type beam coupler constituting an optical system is considered. The holographic imaging device 1 comprises the beam coupler 3 consisting of the cube-type beam splitter arranged between the object 4 and the image sensor 5 and the calculation reference light hologram generation unit 14 for generating an inline reference light hologram jL representing a light wave on the hologram plane 50 by performing a light wave propagation calculation including propagation inside the beam coupler 3, on a spherical wave emitted from the condensing point P2 of the inline spherical wave reference light L. The inline reference light hologram jL is a computer-generated hologram and used for generating an object light hologram g by removing component of the reference light L from a complex-amplitude inline hologram JOL representing the object light O and the inline spherical wave reference light L on the hologram plane 50.