Asymmetric Transmissive Optical Surface Design

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Solution Overview

Problem

Conventional optical beam-shaping systems face challenges in simultaneously controlling the geometric shape and intensity profile of light beams, particularly due to assumptions of symmetry, which limit their design flexibility and efficiency, especially in applications like laser machining, optical communication, and optical scanning.

Innovation Solution

A method and apparatus for designing transmissive optical elements that convert a light beam from a predetermined input profile to a predetermined output profile without symmetry assumptions, using a stationary function to calculate surface properties of the optical element, ensuring energy conservation and transmission conditions are met, allowing for asymmetric input and output profiles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If symmetry assumptions are made in optical beam-shaping system design, then the design problem can be reduced to one spatial dimension enabling solvable mathematical equations, but the design flexibility and efficiency are limited

Engineering Contradiction:
Improvedesign complexityVSAvoiddesign flexibility
Core Design Contradiction:
Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent applies asymmetry by removing symmetry assumptions from the optical beam-shaping system design. The invention enables design of asymmetric optical surfaces that can transform both symmetric and asymmetric input beam profiles into desired output profiles. This is achieved through a variational formulation that does not require symmetry constraints, allowing the optical surfaces to be optimized for general asymmetric cases while maintaining mathematical solvability through the use of transport equations and variational principles.

Inventive Principle:
Principle #4Asymmetry

2Area of moving object

If conventional lenses are used to expand the beam cross-sectional area, then the beam is expanded, but the non-uniform power distribution of the wavefront is carried through to the expanded beam

Engineering Contradiction:
Improvebeam cross-sectional areaVSAvoidpower distribution uniformity
Core Design Contradiction:
Area of moving objectVSManufacturing precision

Solution Approach 1:

The patent applies local quality by designing optical surfaces with spatially varying properties that locally correct the non-uniform power distribution. The variational formulation allows optimization of the optical surface at each point to transform the local intensity and phase, enabling uniform power distribution across the entire expanded beam while maintaining the desired cross-sectional area expansion.

Inventive Principle:
Principle #3Local quality

3Adaptability or versatility

If two non-planar reflectors are used in a beam-shaping system without symmetry assumptions, then asymmetric input and output profiles can be achieved, but the reflectors have to be accurately aligned and any misalignment varies the intensity profile

Engineering Contradiction:
Improveasymmetric profile transformationVSAvoidalignment requirement
Core Design Contradiction:
Adaptability or versatilityVSEase of operation

Solution Approach 1:

The patent applies merging by combining the functions of multiple optical elements into a single transmissive optical element. Instead of using separate reflectors that require precise alignment, the invention integrates the beam-shaping functionality into one element with optimized surfaces, eliminating alignment issues between multiple components while maintaining the ability to transform asymmetric profiles.

Inventive Principle:
Principle #5Merging (Combining)

4Difficulty of detecting and measuring

If symmetry assumptions are made in optical beam-shaping system design, then the mathematical formulation becomes solvable, but the manufacturing complexity increases due to alignment requirements

Engineering Contradiction:
Improvemathematical solvabilityVSAvoidmanufacturing complexity
Core Design Contradiction:
Difficulty of detecting and measuringVSEase of manufacture

Solution Approach 1:

The patent applies asymmetry by formulating the optical design problem without symmetry assumptions, enabling direct design of asymmetric optical surfaces. The variational approach provides mathematical solvability for the general asymmetric case, and the resulting single-element design reduces manufacturing complexity by eliminating alignment requirements between multiple components.

Inventive Principle:
Principle #4Asymmetry

Data Source

PatentUS7573643B2Method and apparatus for designing transmissive optical surfaces
Publication Date: 2009.08.11 TECHNION RES & DEV FOUND LTD
  • US7573643B2 patent drawing
  • US7573643B2 patent drawing
  • US7573643B2 patent drawing

AI summary

A method of designing a transmissive optical element for converting a profile of a light beam from a predetermined input profile to a predetermined output profile is disclosed. The method comprises: calculating a stationary function of a predetermined cost functional selected such that the stationary function satisfies a mapping condition for mapping the predetermined input profile into the predetermined output profile, thereby providing a mapping function. The method further comprises utilizing the mapping function for calculating surface properties of at least a first surface and a second surface of the transmissive optical element.