Interferometric Microscope Layout for Single-Shot 3D Phase Imaging
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Solution Overview
Problem
Conventional Linnik and Mirau interferometers are large, require tedious alignment, and struggle with achieving repeatable auto-reference to absolute zero, delay position, and phase jumps due to fringe order errors, while existing methods do not simultaneously detect fringe patterns with different phase shifts using light polarization in a single-shot approach.
Innovation Solution
A microscope system with an interferometer that tilts a reference mirror and/or sample offset from the centerline of an objective or telescope lens, employing single-shot, polarization-sensitive detection to capture a 3-dimensional image using phase-shifting interferometry, which includes polarized light and quarter wave plates, or oscillating the reference mirror for multiple image capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional Linnik and Mirau interferometers are used, then interferometry measurement is achieved, but the device size becomes large and alignment becomes tedious
Solution Approach 1:
The interferometer is integrated within the microscope system, with the reference mirror positioned within the objective lens structure. This nesting approach allows the interferometric measurement functionality to be embedded within the existing microscope architecture, reducing overall device size and simplifying alignment procedures while maintaining measurement precision
Solution Approach 2:
The objective lens is designed to serve dual functions: traditional optical focusing and interferometric reference reflection. By making the reference mirror integral to the objective lens structure, the system achieves multi-functionality where the same optical component performs both imaging and interferometric measurement tasks, thereby reducing device complexity
2Measurement precision
If conventional interferometers are used, then measurement is achieved, but achieving repeatable auto-reference to absolute zero and avoiding phase jumps becomes challenging
Solution Approach 1:
The system performs self-reference calibration by utilizing the integrated reference mirror within the objective lens. The reference path automatically reflects from this built-in mirror, enabling the system to self-correct and establish repeatable auto-reference to absolute zero without requiring external calibration equipment or complex manual adjustment procedures
Solution Approach 2:
The interferometric path is designed with asymmetric configuration where the reference mirror is intentionally positioned at a specific angle within the objective lens. This asymmetric design creates a stable, reproducible reference path that eliminates phase jumps and enables consistent auto-reference calibration
3Measurement precision
If traditional interferometers are used, then measurement capability is provided, but vibration isolation and drift compensation are required
Solution Approach 1:
The reference path and sample path are merged into a compact configuration within the microscope objective. By combining these paths and using the same objective lens for both, the system minimizes the physical separation between reference and sample arms, thereby reducing sensitivity to vibrations and environmental drift while maintaining full interferometric measurement capability
4Productivity
If conventional imaging methods are used, then standard imaging is achieved, but simultaneous detection of fringe patterns with different phase shifts is not possible
Solution Approach 1:
The system utilizes polarization as an additional dimension to encode phase shift information. By employing polarization-sensitive detection, the system can simultaneously capture fringe patterns with different phase shifts in a single shot, as each polarization state carries distinct phase information. This transforms the problem from temporal sequencing to spatial/polarization multiplexing
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
Enables high-resolution 3D imaging of complex surfaces with maintained spatial resolution, minimizes vibration and drift, and allows quick acquisition of interference patterns, suitable for observing samples with significant angular offsets and complex shapes, while being insensitive to vibrations.
Implementation Method 1
splitting the light emission into a reference path and a sampling path
Implementation Method 2
reflecting the light emission in the reference path with the reference mirror; reflecting the light emission in the sampling path with a sample
Implementation Method 3
polarizing the light emission of the reference path between the splitting and the reflecting with the reference mirror
Implementation Method 4
phase-shifting at least one of the reflected light emissions; single-shot, polarization-sensitive detection to capture a 3-dimensional image using phase-shifting interferometry
Implementation Method 5
transmitting the reflected light emission from the reference path and the reflected light emission from the sampling path to a polarized detector; capturing a 3-dimensional image of the sample with the detector
Data Source
AI summary
A system and method include a microscope with an interferometer. Another aspect of an optical microscope with interferometry includes tilting a reference mirror and/or a sample offset from a centerline of an adjacent objective or telescope lens. A further aspect provides a microscope system and method which are configured to simultaneously detect a fringe pattern with a phase-shift using light polarization in a single-shot.