Geometric Phase In-Line Holography for Stable Transmissive Scanning
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Solution Overview
Problem
Existing optical scanning holography systems require high coherence and stability, but are sensitive to high coherence and high coherence, with a single coherence and high coherence, but are not sensitive to high coherence and high coherence.
Innovation Solution
A geometric phase in-line scanning holography system for transmissive objects using a polarization sensitive lens and geometric phase structure to form a scanning pattern on a single optical path, eliminating the need for complex modulation devices and achieving high-efficiency and high-quality holograms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional optical scanning method uses two split optical paths to form scanning pattern, then scanning hologram can be obtained, but optical path difference exceeds coherence length requiring high-coherence light source and high-stability wavelength control
Solution Approach 1:
The patent merges the reference beam and object beam into a single optical path using a polarization-sensitive lens. The lens receives circularly polarized light and outputs linearly polarized light that serves as both reference and object beams, eliminating the need for separate optical paths and wavelength control mechanisms.
Solution Approach 2:
The patent replaces mechanical/optical path control mechanisms with a polarization-based control mechanism. The polarization-sensitive lens uses polarization state transformation instead of physical path length control, eliminating the need for high-stability wavelength control and reducing mechanical complexity.
2Measurement precision
If acoustic optical modulator or electron optical modulator is used to modulate light phase, then twin image noise and background noise can be eliminated, but device becomes bulky and power consumption increases
Solution Approach 1:
The patent replaces bulky acoustic optical modulators and electron optical modulators with a compact polarization-sensitive lens. The lens performs phase modulation through polarization state transformation rather than acoustic or electronic mechanisms, eliminating the need for MHz signal generators and high-voltage amplifiers.
Solution Approach 2:
The patent changes the modulation mechanism from acoustic/electronic parameter control to optical polarization parameter control. The polarization-sensitive lens modulates light phase by transforming polarization states, using optical parameters instead of acoustic or electrical parameters, resulting in a more compact and efficient system.
3Speed
If acoustic optical modulator is used for phase modulation, then high-frequency signal generation is required, but power loss increases due to high-energy sound wave generation
Solution Approach 1:
The patent replaces the acoustic optical modulator's high-energy sound wave generation with a polarization-sensitive lens that uses optical polarization transformation. This substitution eliminates the need for high-power acoustic drivers and MHz signal generators, dramatically reducing power consumption while maintaining high-frequency response capability.
4Measurement precision
If electron optical modulator is used for phase modulation, then phase control is achieved, but voltage amplifier and high voltage generation are required increasing device complexity
Solution Approach 1:
The patent replaces the electron optical modulator's voltage-based control with a polarization-sensitive lens that uses optical polarization state control. This substitution eliminates the need for voltage amplifiers and high-voltage power supplies, reducing electrical system complexity while maintaining precise phase control through polarization transformation.
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 system provides stable and low-complexity holograms with reduced twin image and background noise, suitable for mobile devices, by using a polarization sensitive lens and geometric phase detection.
Implementation Method 1
a polarization sensitive lens which receives a linearly polarized beam to generate a first spherical wave of right-handed circularly polarized light having a negative focal distance and a second spherical wave of left-handed circularly polarized light having a positive focal distance
Implementation Method 2
a scan means which scans the transmissive object by using an interference beam generated between the generated first and second spherical waves
Data Source
AI summary
A geometric phase in-line scanning holography system for a transmissive object, includes: a polarization sensitive lens, which receives a linear polarization beam to generate a first spherical wave of right-sided circularly polarized light and a second spherical wave of left-sided circularly polarized light; a scan means for scanning the transmissive object by using an interference beam generated between the generated first and second spherical waves; a first beam splitter, which receives a beam having been transmitted through the transmissive object, so as to split the received beam into first and second output beams; first and second polarizers for polarizing the first and second output beams, respectively; and first and second photodetectors for detecting output beams having passed through the first and second polarizers.