Laser Beam Steering and Wavefront Control Across Wide Wavelength Ranges
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Solution Overview
Problem
Conventional laser-processing components and techniques are limited in their ability to efficiently process workpieces using laser energy across different wavelength ranges, particularly between ultraviolet and long wave infrared, and lack flexibility in rapidly changing laser properties such as pulse duration and repetition rate.
Innovation Solution
A laser-processing apparatus with a first positioner that deflects laser beams within non-overlapping angular ranges, integrated beam dump systems, wavefront correction optics, and acousto-optic deflectors to manage beam paths and laser energy properties, enabling versatile processing across various wavelengths and rapid property changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional laser-processing components are used, then processing at a specific wavelength is achieved, but adaptability to different wavelength ranges is limited
Solution Approach 1:
The patent implements a universal laser-processing apparatus that can handle multiple wavelength ranges (ultraviolet, visible, infrared) by integrating wavelength-agile optical components. The system uses a single platform that can process different workpiece types across the electromagnetic spectrum, eliminating the need for separate specialized systems for each wavelength range.
Solution Approach 2:
The system dynamically adjusts key laser parameters including pulse duration (from femtoseconds to milliseconds), pulse repetition rate (from kHz to MHz), and wavelength (across UV, visible, and IR ranges) to optimize processing for different materials and applications. This parameter agility allows the same apparatus to adapt to diverse processing requirements without hardware changes.
2Productivity
If high-power laser sources are used to rapidly process workpieces, then productivity increases, but control over rapid property changes becomes difficult
Solution Approach 1:
The patent employs dynamic control systems that can rapidly modulate laser parameters during operation. The system features real-time adjustment capabilities for pulse duration, repetition rate, and power levels, allowing operators to quickly respond to different processing requirements and material properties while maintaining high productivity through automated parameter optimization.
3Adaptability or versatility
If conventional positioners are used for beam deflection, then single angular range coverage is achieved, but multi-range angular deflection capability is limited
Solution Approach 1:
The patent divides the beam deflection function into multiple positioner stages, each responsible for a specific angular range. This segmentation allows the system to cover a broad total angular range by combining the capabilities of individual positioners, with each unit optimized for its designated range while maintaining overall system coordination through centralized control.
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
Enables efficient and flexible laser-processing of diverse materials by allowing rapid deflection and modification of laser energy properties, enhancing processing capabilities and adaptability to different workpiece types.
Implementation Method 1
a first positioner arranged within the beam path, wherein the first positioner is operative to deflect the beam path
Implementation Method 2
a beam dump coupled to the frame and configured to absorb the beam of laser energy
Implementation Method 3
wavefront correction optics, and acousto-optic deflectors to manage beam paths and laser energy properties
Data Source
AI summary
Numerous embodiments are disclosed. In one, a laser-processing apparatus includes a positioner arranged within a beam path along which a beam of laser energy is propagatable. A controller may be used to control an operation of the positioner to deflect the beam path within first and second primary angular ranges, and to deflect the beam path to a plurality of angles within each of the first and second primary angular ranges. In another, an integrated beam dump system includes a frame; and a pickoff mirror and beam dump coupled to the frame. In still another, a wavefront correction optic includes a mirror having a reflective surface having a shape characterized by a particular ratio of fringe Zernike terms Z4 and Z9. Many more embodiments are disclosed.