Line-Forming Optical System with Aperture Truncation
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Solution Overview
Problem
Traditional methods for forming a line image using a high-power laser beam are inefficient, as they typically reject 90% of the laser beam, and attempting to use a larger portion of the beam results in non-uniformity due to the Gaussian beam's intensity drop-off.
Innovation Solution
A line-forming optical system that includes a laser source, a beam-conditioning system, and a relay optical system with aperture devices to truncate the intensity profile, allowing at least 50% of the laser beam to form a uniform line image with intensity uniformity within +/-5% over its length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If only the narrow central portion of the Gaussian laser beam is used to form the line image, then the intensity uniformity along the line image is improved, but the efficiency of laser beam utilization deteriorates (90% rejection)
Solution Approach 1:
The patent divides the laser beam into multiple segments: the central portion and multiple side lobes. By using a cylindrical lens to generate side lobes and strategically positioning aperture devices, the system segments the beam in a way that allows multiple segments to contribute to the final line image, thereby improving overall beam utilization while maintaining uniformity through controlled truncation of each segment.
Solution Approach 2:
The patent transforms the Gaussian beam parameters by using a cylindrical lens to create an intensity profile with side lobes. This parameter change in the beam structure allows the system to capture more total energy while the aperture devices control the truncation to maintain uniformity, thus resolving the contradiction between efficiency and uniformity.
2Loss of energy
If a larger portion of the Gaussian beam is used to improve efficiency, then the laser beam utilization efficiency is improved, but the intensity uniformity along the line image deteriorates due to Gaussian intensity drop-off
Solution Approach 1:
The patent introduces a cylindrical lens as an intermediary element that transforms the Gaussian beam into a profile with side lobes. This intermediary structure allows the system to utilize more of the original beam energy while the aperture devices act as secondary intermediaries to truncate the profile and restore uniformity, thus resolving the contradiction between efficiency and uniformity.
3Manufacturing precision
If traditional knife-edge methods are used to form the line image, then the intensity uniformity is maintained, but the device complexity increases and efficiency decreases
Solution Approach 1:
The patent makes the aperture devices adjustable and reconfigurable, allowing them to perform multiple functions: truncating the central portion, controlling side lobe contributions, and adapting to different beam conditions. This multi-functionality reduces the need for separate specialized components, thereby reducing overall system complexity while maintaining uniformity.
Solution Approach 2:
The patent employs dynamically adjustable aperture devices that can be reconfigured based on operating conditions. This dynamic capability allows the system to adapt to different scenarios (different beam sizes, wavelengths, or uniformity requirements) without requiring multiple fixed systems, thus reducing complexity while maintaining performance.
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 high efficiency by utilizing at least 50% of the laser beam and maintaining intensity uniformity along the line image, improving upon previous methods by using reflective optical components and cylindrical optics to form a line image with enhanced power density and scanning capabilities.
Implementation Method 1
a beam-conditioning optical system that receives the initial laser beam and forms therefrom a conditioned laser beam having a first intensity profile with a Gaussian distribution
Implementation Method 2
the relay optical system defining at the intermediate image plane a second intensity profile having a central peak and first side peaks immediately adjacent the central peak
Implementation Method 3
a first aperture device operably disposed at the object plane and that defines a first slit aperture that truncates the first intensity profile in the first direction to define a first transmitted light
Data Source
AI summary
A line-forming optical system and method are disclosed that form a line image with high-efficiency. A method includes forming a laser beam having a first intensity profile with a Gaussian distribution in at least a first direction and passing at least 50% of the laser beam in the first direction to form a first transmitted light. The method also includes: focusing the first transmitted light at an intermediate image plane to define a second intensity profile having a central peak and first side peaks immediately adjacent the central peak; then truncating the second intensity profile within each of first side peaks to define a second transmitted light; and then forming the line image at an image plane from the second transmitted light.