Laser Radiation Device with Reflective Mirrors for Low Optical Density Workpieces
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Solution Overview
Problem
Existing devices for applying laser radiation to partially reflective or transparent workpieces are inefficient when the workpiece has low optical density, and they struggle to effectively image linear light distributions with large longitudinal extent.
Innovation Solution
The device incorporates an optical arrangement with mirrors to reflect and re-transmit laser radiation, allowing it to be partially returned to the work area, and uses cylindrical lenses with specific focal lengths and refractive indices to maintain image quality and absorbance, even for large light distributions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional focusing lens is used to apply laser radiation to a workpiece with low optical density, then the device structure is simple, but the absorption of laser radiation by the workpiece is insufficient
Solution Approach 1:
The optical arrangement with mirrors enables the laser radiation to pass through the work area multiple times in succession, maintaining continuous useful action. Each pass contributes to absorption by the low-density layer, cumulatively increasing total energy absorption while keeping the device structure relatively simple
Solution Approach 2:
Instead of increasing absorption by intensifying the beam in one dimension, the invention extends the interaction path through multiple passes in different spatial dimensions using mirrors, allowing the same beam to interact with the workpiece repeatedly from different angles and positions
2Manufacturing precision
If four arrays of cylindrical lenses are arranged in succession with fixed distances to image a linear light distribution, then the imaging ratio is 1:1, but the device cannot effectively image light distributions with large longitudinal extent
Solution Approach 1:
The patent introduces adjustable optical elements (mirrors and/or cylindrical lenses) that allow dynamic modification of the optical path and imaging parameters. This enables the system to adapt to different light distribution extents by changing the optical configuration, transforming a static fixed-ratio imager into a dynamic system capable of handling various scales
Solution Approach 2:
The invention allows changing key optical parameters such as the distances between optical elements, the focal lengths used, and the angles of incidence. By adjusting these parameters, the system can maintain imaging quality for light distributions of different longitudinal extents, overcoming the fixed 1:1 ratio limitation
3Area of stationary object
If light beams incident at large angles are used to expand the imaging capability, then the coverage area increases, but the image quality deteriorates in conventional devices
Solution Approach 1:
The optical system divides the incident light into multiple segments or passes, with each pass handling a specific angular range. By segmenting the optical path and using multiple mirrors or lens arrays, the system can process large-angle incident beams while maintaining image quality through controlled refraction and reflection at each segment
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 significantly enhances the absorption of laser radiation by the workpiece and allows for effective imaging of linear light distributions with large extent, improving the device's universality and effectiveness.
Implementation Method 1
four arrays of cylindrical lenses are arranged in succession on two substrates in the propagation direction of the light of a light distribution to be imaged
Implementation Method 2
an optical arrangement including at least one mirror for reflecting a portion of the laser radiation in the work area or a portion of the laser radiation that has passed through the work area
Data Source
AI summary
A device for applying laser radiation to an at least partially reflective or transparent region or a workpiece disposed in a working area, with a laser light source for generating the laser radiation and optics for influencing the laser radiation, such that the radiation is transferred into the working area, wherein the optics comprise at least one mirror that can reflect a part of the laser radiation reflected in the working area or a part of the laser radiation having passed through the working area, such that said part of the laser radiation is at least partially fed hack into the working area.