Wavefront Manipulator Achromatic Design
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Solution Overview
Problem
Existing wavefront manipulators for polychromatic applications face challenges due to unwanted chromatic aberrations, require immersion media which are costly and difficult to manage, and struggle with stray light issues in diffractive structures, limiting their applicability in broadband and stray light-critical applications.
Innovation Solution
A wavefront manipulator design featuring two optical components with different refractive indices and Abbe numbers, arranged in succession and movable perpendicular to the optical axis, eliminating the need for immersion media and diffractive structures, achieving an achromatic refractive power effect through carefully selected solid optical materials and free-form surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a monochromatic wavefront manipulator with refractive index profile n(λ) is used, then wavefront deformation can be impressed on incident light, but chromatic aberrations are generated in polychromatic applications
Solution Approach 1:
The single plate with wavelength-dependent refractive index is segmented into two separate plates: a first plate with refractive index n1(λ) and a second plate with refractive index n2(λ). Each plate contributes to the wavefront deformation, and their combined effect achieves achromatic performance by compensating for chromatic aberrations while maintaining wavefront manipulation capability.
Solution Approach 2:
The system uses a composite optical structure with two different transparent materials having distinct refractive index profiles n1(λ) and n2(λ). The combination of these materials creates a net refractive power that is independent of wavelength, eliminating chromatic aberrations while preserving the ability to impress wavefront deformations.
2Object-affected harmful factors
If immersion media are used between optical plates to correct chromatic aberrations, then longitudinal chromatic aberration can be corrected, but device complexity and cost increase
Solution Approach 1:
The immersion media is completely removed from the system. Instead of using a liquid medium between plates to correct chromatic aberrations, the invention achieves the same correction through the refractive index profiles of the plates themselves. This eliminates the complexity of containing and sealing immersion media while maintaining achromatic performance.
Solution Approach 2:
The liquid immersion medium is replaced by a solid optical structure with carefully designed refractive index profiles. The chromatic correction is achieved through the material properties of the plates rather than through a liquid medium, simplifying the mechanical structure and eliminating sealing requirements.
3Object-affected harmful factors
If diffractive structures are used to manipulate wavefronts, then wavelength-dependent effects can be corrected, but stray light from unwanted diffraction orders is generated
Solution Approach 1:
The diffractive optical element is replaced by refractive optical plates with free-form surfaces. The wavefront manipulation and chromatic correction are achieved through refraction rather than diffraction, eliminating the generation of stray light from unwanted diffraction orders while maintaining the ability to correct wavelength-dependent wavefront errors.
Solution Approach 2:
Instead of using diffraction which inherently produces stray light, the invention uses refraction through carefully designed refractive index profiles to achieve both wavefront manipulation and chromatic correction simultaneously. The refractive structures provide a beneficial alternative that eliminates the harmful stray light effect.
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 design provides a wavelength-independent refractive power effect, minimizing chromatic aberrations and stray light, enabling versatile applications in zoom lenses, microscopy, and other optical systems without the need for immersion media or diffractive structures.
Implementation Method 1
each having a refractive index ni and an Abbe number vi, with the refractive indices ni and the Abbe numbers vi being different from one another... achieving an achromatic refractive power effect
Data Source
AI summary
A wavefront manipulator includes a first optical component and a second optical component arranged one behind the other along a reference axis. The first optical component and the second optical component are arranged movably relative to one another in a plane perpendicular to the reference axis. The first optical component and the second optical component each include a first optical element having at least one freeform surface, a refractive index m and an Abbe number v1, and a second optical element having at least one freeform surface, a refractive index n2 and an Abbe number v2, which are arranged one behind the other along the reference axis, the Abbe numbers v1 and v2 differing from one another (v1≠v2).