Wavefront Detection with 4f Lens Optical Path Alignment
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Solution Overview
Problem
Existing wavefront detection systems face difficulties in accurately building the optical path due to challenges in positioning the imaging sensor and maintaining precise distances, making it difficult to collect high-quality interference images.
Innovation Solution
The system employs a 4f lens group with a front and rear lens configuration, where the rear focal plane of the front lens coincides with the front focal plane of the rear lens, allowing the imaging sensor to be placed on the rear focal plane of the rear lens, and the grating in front of the front focal plane, without requiring precise positioning or distance measurement, simplifying the optical path construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional wavefront detection system is used, then wavefront detection can be performed, but the optical path construction is difficult due to precise positioning requirements
Solution Approach 1:
The patent applies the equipotentiality principle by making the rear focal plane of the front lens coincide with the front focal plane of the rear lens in the 4f lens group. This creates an optical equipotential surface where the optical path lengths are equalized, eliminating the need for precise distance measurements and positioning. The imaging sensor can be freely positioned on this equipotential plane without affecting wavefront detection accuracy.
2Reliability
If imaging sensor is positioned on rear focal plane, then high-quality interference images can be collected, but precise distance measurement is required
Solution Approach 1:
By designing the 4f lens group with coinciding focal planes, the patent creates an optical equipotential surface. Any position on this plane provides equivalent optical path conditions, allowing the imaging sensor to collect high-quality interference images without requiring precise distance measurement or positioning. This transforms a precision-critical application into a robust, easily implementable system.
3Measurement precision
If grating is placed in front of front focal plane, then wavefront detection is enabled, but complex distance control is needed
Solution Approach 1:
The patent positions the grating in front of the front focal plane of the front lens, which is part of the optical equipotential surface. This positioning, combined with the coinciding focal planes of the 4f lens group, enables wavefront detection while eliminating the need for complex distance control. The equipotential nature of the optical path allows for easy setup and adjustment.
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 reduces the complexity of building the optical path by eliminating the need for accurate sensor positioning and distance measurement, enabling high-quality interference image collection.
Implementation Method 1
a rear focal plane of the front lens at the target waveband coincides with a front focal plane of the rear lens at the target waveband
Implementation Method 2
setting the optical gratings on the outgoing side of the sample lens, so that the lasers at a specific waveband generate interference while passing through the grating
Implementation Method 3
the lasers at a specific waveband generate interference while passing through the grating
Data Source
AI summary
A wavefront detection system and a building method of the optical path are provided The wavefront detection system includes: a target light source configured to emit a target laser at a target waveband; a grating, a 4f lens group and a camera along a propagation direction of the target laser in sequence; the 4f lens group includes a front lens and a rear lens along the propagation direction of the target laser in sequence; a rear focal plane of the front lens at the target waveband coincides with a front focal plane of the rear lens at the target waveband; an imaging sensor of the camera is configured to sense the target laser; the imaging sensor is set on a rear focal plane of the rear lens at the target waveband.