Laser Drilling Pulse Control for Material Processing
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Solution Overview
Problem
Existing high power pulsed lasers, such as Nd:YAG lasers, have predetermined optical pulse characteristics that cannot be easily varied, making it difficult to achieve optimal pulse width, shape, and repetition rate for specific material processing applications like drilling, which limits the quality and throughput of laser-based material processing.
Innovation Solution
A method and system that allow for the adjustment of one or more characteristics of laser pulses within a series, such as pulse energy, inter-pulse time interval, pulse width, and temporal pulse shape, to optimize the drilling process for each hole, enabling the creation of holes with specific attributes like barrel or tapered shapes and reduced debris.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional Q-switching or mode locking techniques are used to generate high power pulsed laser, then high pulse energy can be achieved, but the optical pulse characteristics are predetermined and cannot be varied in the field
Solution Approach 1:
The patent implements dynamic control of laser pulse characteristics by allowing real-time adjustment of pulse width, shape, and repetition rate through electronic modulation. The system transitions from fixed characteristics determined by cavity geometry to dynamically adjustable parameters controlled by a modulator and processing circuitry, enabling adaptation to different drilling applications without compromising pulse energy.
Solution Approach 2:
The patent changes the physical parameters of the laser system by introducing external modulation that allows independent variation of pulse characteristics. The modulator responds to trigger signals to generate pulses with programmable widths and shapes, while the processing circuitry enables field adjustment of repetition rates and pulse energies, fundamentally changing the static parameter regime of traditional lasers.
2Ease of operation
If fixed pulse parameters are used in laser drilling, then the laser system is simpler to operate, but the processing quality and throughput are limited
Solution Approach 1:
The patent applies preliminary action by pre-programming optimal pulse sequences for different drilling scenarios. The processing circuitry stores and executes predetermined pulse patterns that have been optimized for specific materials and hole configurations, allowing operators to select from pre-configured modes rather than manually adjusting parameters in real-time, thus maintaining ease of operation while achieving high productivity.
Solution Approach 2:
The patent utilizes periodic action through controlled pulse repetition rates that can be adjusted to optimize drilling throughput. The system delivers sequences of pulses at programmable intervals, allowing the laser to operate in continuous periodic modes for high-volume production while maintaining the ability to switch between different periodic patterns for different applications.
3Manufacturing precision
If variable pulse characteristics are implemented, then processing quality and throughput are improved, but the device complexity increases
Solution Approach 1:
The patent introduces an intermediary modulator component that sits between the laser source and the material being processed. This modulator acts as a buffer that translates simple trigger signals into complex pulse patterns, allowing the laser cavity itself to remain relatively simple while achieving sophisticated pulse characteristics through the intermediary device that can be independently controlled and optimized.
Solution Approach 2:
The patent replaces mechanical adjustments of laser cavity geometry with electronic control systems. Instead of physically reconfiguring optical components to change pulse characteristics, the system uses electronic modulators and digital processing circuitry to programmatically control pulse parameters, substituting mechanical complexity with electronic flexibility that is easier to control and reproduce.
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 improves the quality and speed of hole drilling, enhancing the reliability and yield of processed materials by allowing for tailored pulse characteristics in each series of pulses, overcoming the limitations of traditional lasers with fixed pulse parameters.
Implementation Method 1
Pulsed laser sources, such as Nd:YAG lasers have been used to perform laser-based material processing for applications such as marking, engraving, micro-machining, and cutting
Data Source
AI summary
A series of laser pulses, each pulse characterized by one or more predetermined pulse characteristics including wavelength, pulse energy, inter-pulse time interval, pulse width or pulse shape, is provided to drill a hole in a material. Drilling the hole in the material is achieved by placing the series of laser pulse spots at the location wherein the hole is to be drilled. One or more characteristics of one or more laser pulses in the series is changed in order to optimize the drilling process for the hole. The ability to change the characteristics of one or more laser pulses in the series of pulses to optimize the drilling process results in holes with desired attributes and a high drilling rate.