Spherical Acoustic Wave Refractive Index Lens
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Solution Overview
Problem
Traditional methods for converging light rays using acoustic waves in fluids, such as the TAG lens, face limitations in tunability and flexibility, particularly in achieving controlled spherical aberration and focal length, especially in gases where refractive index modulation is weak.
Innovation Solution
The use of spherical acoustic waves in liquids or gases to create a refractive index modulation that forms a spherical optical lens, allowing for control of focal length and spherical aberration through adjustments in wave frequency and intensity, and enabling the formation of high-magnification microscopes with multiple acoustic sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional TAG lens uses cylindrical acoustic waves with sharp boundary refraction, then light convergence is achieved, but tunability of focal length and control of spherical aberration are limited
Solution Approach 1:
The patent employs dynamic control of spherical acoustic waves to achieve real-time tuning of focal length. By varying the frequency and amplitude of the spherical acoustic waves, the refractive index distribution within the fluid medium can be dynamically adjusted, enabling continuous focal length tuning without mechanical movement or complex boundary changes.
Solution Approach 2:
The invention changes physical parameters of the acoustic field (frequency, amplitude, spherical wave radius) to control optical properties. By modulating these acoustic parameters, the refractive index gradient in the fluid can be precisely controlled, allowing independent adjustment of focal length and spherical aberration characteristics.
2Manufacturing precision
If acoustic wave intensity is increased to enhance refractive index modulation, then lens focusing power improves, but spherical aberration increases
Solution Approach 1:
The patent creates a spatially varying refractive index distribution through spherical acoustic waves, where the refractive index changes radially from the center. This local variation in optical properties allows different regions of the lens to have optimized characteristics, with the spherical wave geometry naturally compensating for aberrations that would otherwise result from high intensity modulation.
Solution Approach 2:
By using spherical acoustic waves instead of planar or cylindrical waves, the invention introduces a curved wavefront that matches the desired lens geometry. The spherical symmetry of the acoustic field creates a radially symmetric refractive index distribution that inherently reduces spherical aberration while maintaining strong focusing capability.
3Adaptability or versatility
If spherical acoustic waves are used in gases to form lenses, then flexibility of medium selection is improved, but refractive index modulation becomes too weak
Solution Approach 1:
The patent enhances refractive index modulation in gases by transitioning to higher dimensional acoustic field configurations (spherical waves from point sources). This dimensional change concentrates acoustic energy more effectively in three-dimensional space, creating sufficient pressure variations to induce measurable refractive index changes in gas media that would be unachievable with simpler acoustic configurations.
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 results in a lens that effectively converges light rays with adjustable focal length and reduced spherical aberration, comparable to conventional lenses, and can be applied in liquids like water and glycerin, with potential for use in gases using resonance, multi-source, or nonlinear effects, offering a flexible and efficient alternative to solid lens manufacturing.
Implementation Method 1
a spherical optical lens formed in a liquid or a gas, the spherical optical lens is formed by refractive index modulations associated with an acoustic wave
Implementation Method 2
exposing the optical beam to a modulated refractive index owing to an inner most wave front of the altered or perturbed medium being accompanied with high pressure modulation, thereby resulting in bending of the optical beam
Data Source
AI summary
There is disclosed a spherical optical lens formed in a liquid or a gas, the spherical optical lens is formed by refractive index modulations associated with an acoustic wave, wherein a spherical aberration and focal length of the acoustic wave are controllable. Also disclosed is a method of forming an acousto-optic spherical lens in a homogeneous medium, comprising the steps of introducing an alteration in a refractive index of the medium using acoustic field of a spherical wave, thereby forming a shape of the acousto-optic spherical lens, passing an optical beam through the altered or perturbed medium, exposing the optical beam to a modulated refractive index owing to an inner most wave front of the altered or perturbed medium being accompanied with high pressure modulation, thereby resulting in bending of the optical beam.