Common-Path Cube Corner Interferometer Stability
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Solution Overview
Problem
Traditional common-path interferometers, such as Sagnac interferometers, are susceptible to environmental disturbances and have low beam energy utilization, leading to instability and inaccurate measurements.
Innovation Solution
A common-path cube corner interferometer is designed using right-angled cube-corner retroreflectors and an asymmetric beam-splitting structure with a semi-transmissive and semi-reflective beam splitter, plane mirrors, and an optical path difference element, which reduces environmental interference and maximizes beam energy utilization by generating a large optical path difference between two beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional plane mirrors are used in common-path interferometers, then the device complexity is reduced, but the stability deteriorates due to environmental interference causing position changes
Solution Approach 1:
The patent replaces traditional plane mirrors with cube corner retroreflectors. This substitution eliminates the need for precise angular alignment of mirrors while maintaining optical path stability. The cube corner retroreflector's geometry inherently returns light parallel to the incident beam regardless of small angular deviations, thus replacing the mechanical alignment system with a geometric solution that is insensitive to environmental disturbances.
Solution Approach 2:
The patent changes the optical path length parameter by introducing different numbers of reflections for the two beams. One beam undergoes 3 reflections while the other undergoes 5 reflections, creating a controllable optical path difference. This parameter change enables the generation of interference fringes while maintaining the stability benefits of the common-path configuration.
2Device complexity
If only one path is used as interference output in traditional interferometers, then the device complexity is reduced, but the energy utilization deteriorates
Solution Approach 1:
The patent introduces an asymmetric optical path configuration where the two beams travel different paths with different numbers of reflections (3 vs. 5). This asymmetry allows both beams to be utilized for interference while creating the necessary optical path difference. The asymmetric design enables dual-path energy utilization without requiring complex additional components, as the asymmetry itself generates the interference condition.
Solution Approach 2:
The patent makes the optical system multi-functional by utilizing both the direct beam and the reflected beam for interference output. Instead of discarding one beam path, the system is designed so that both beams contribute to the interference pattern, effectively doubling the energy utilization. The cube corner retroreflector serves multiple functions: directing beams, creating path difference, and ensuring parallel output.
3Adaptability or versatility
If traditional common-path interferometers are used, then the environmental adaptability is improved, but the measurement precision deteriorates due to low optical path difference
Solution Approach 1:
The patent extends the optical path difference by introducing additional reflections in one of the beams. Instead of relying solely on physical path length extension, the system uses dimensional extension through multiple reflections off the cube corner retroreflectors. One beam reflects 3 times while the other reflects 5 times, creating a substantial optical path difference that enhances measurement precision while maintaining the compact common-path configuration.
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 solution provides stable interference fringes with improved energy utilization and sensitivity, reducing the impact of environmental disturbances and facilitating precise angle alignment.
Implementation Method 1
a semi-transmissive and semi-reflective beam splitter splits incident light into a first transmitted beam and a second reflected beam
Implementation Method 2
a first right-angled cube-corner retroreflector and a second right-angled cube-corner retroreflector... the first beam is sequentially reflected by the plane mirror, the first right-angled cube-corner retroreflector
Implementation Method 3
The first beam is sequentially reflected by the plane mirror, the first right-angled cube-corner retroreflector, the plane mirror, the second right-angled cube-corner retroreflector, the plane mirror, and then returns to the semi-transmissive and semi-reflective beam splitter
Implementation Method 4
an optical path difference element; wherein... so that an optical path difference is generated between the first beam and the second beam
Implementation Method 5
Interferometers utilize the superposition of waves to obtain phase information of waves... obtain physical quantities of concern for experiments
Data Source
AI summary
The present disclosure relates to a common-path cube-corner retroreflector interferometer with a large optical path difference and high stability, and an interference technique thereof. The interferometer adopts an asymmetric common-path beam splitting structure using right-angled cube-corner retroreflectors, comprising a semi-transmissive and semi-reflective beam splitter, a plane mirror, a first right-angled cube-corner retroreflector, a second right-angled cube-corner retroreflector and an optical path difference element. The incident light is divided into a first transmitted beam and a second reflected beam, which are respectively reflected by the plane mirror and the right-angled cube-corner retroreflectors several times and then split again, two beams of which become interference outputs along directions perpendicular to an incident direction of the incident light, and the other two beams become interference outputs along directions parallel to the incident light. The present disclosure also provides an interference technique based on the interferometer described above.