Aberration-Induced Gaussian to Flat-Topped Laser Beam Transformation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current optical systems that focus laser beams with a Gaussian intensity profile into a quasi-flat-topped intensity profile are complex and costly, and are not suitable for scanning applications, as they often require highly specialized optical elements like microlens arrays.
Innovation Solution
An optical system that introduces specific optical aberrations, such as third-order spherical aberration and defocus, using a diffraction-limited lens to transform a Gaussian laser-beam into a quasi-flat-topped intensity profile, allowing for cost-effective and scalable production while enabling beam scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If highly aspheric lens elements, diffractive optical elements, or microlens arrays are used to transform Gaussian intensity profile to flat-topped profile, then the intensity profile transformation is achieved, but the device complexity and manufacturing cost increase significantly
Solution Approach 1:
The patent introduces controlled optical aberrations (specifically spherical aberration and defocus) into the optical system to transform the Gaussian intensity profile into a flat-topped profile. By deliberately adjusting aberration parameters rather than using complex aspheric surfaces or diffractive elements, the system achieves the desired intensity distribution with simpler optical components.
Solution Approach 2:
The patent converts optical aberrations, which are typically considered harmful defects to be eliminated, into a beneficial tool for transforming the intensity profile. By intentionally introducing and controlling spherical aberration and defocus, the system achieves flat-topped intensity distribution without requiring complex corrective optics.
2Manufacturing precision
If complex optical elements are used to achieve flat-topped intensity profile, then the intensity transformation is achieved, but the manufacturing cost increases
Solution Approach 1:
The patent achieves intensity profile transformation by adjusting optical parameters (aberration levels, defocus amounts) rather than manufacturing complex aspheric surfaces or diffractive structures. This approach uses standard optical elements with controllable parameters, significantly reducing manufacturing complexity and cost.
Solution Approach 2:
The patent replaces expensive, complex optical elements (aspheric lenses, diffractive optical elements, microlens arrays) with simpler, more economical optical components that introduce controlled aberrations. This substitution maintains functional performance while dramatically reducing manufacturing costs.
3Manufacturing precision
If microlens-array beam homogenizers are used to achieve flat-topped profile, then the intensity profile is transformed, but the capability for beam scanning is lost
Solution Approach 1:
The patent separates the intensity transformation function from the beam delivery function. By using aberration-introducing elements in conjunction with a diffraction-limited scanning lens, the system allows independent optimization of intensity profile transformation and beam scanning capability, unlike microlens arrays that couple these functions and prevent scanning.
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 system achieves a quasi-flat-topped intensity profile, reducing tissue charring and under-treatment in dermatological applications and improving material processing by maintaining a lower peak intensity and broader distribution, suitable for industrial welding and cutting operations.
Implementation Method 1
a substantially diffraction-limited lens having a longitudinal optical axis and arranged to focus the laser-beam into a focal region
Implementation Method 2
one or more optical elements configured to introduce one or more optical aberrations into the laser-beam before the laser-beam is focused into the focal region
Data Source
AI summary
An optical system is configured for projecting an image having a quasi-flat-topped intensity profile from a laser-beam having a Gaussian intensity profile. The optical system includes a diffraction limited lens for focusing the laser beam and one or more optical elements that introduce aberration into the beam before the beam is focused. The aberration introduced causes the Gaussian intensity profile to be changed to the quasi-flat-topped intensity profile at some position in a focal region of the diffraction-limited lens.