Mode-Locked Solid-State Laser for High-Energy Precision Machining
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Solution Overview
Problem
Existing ultrashort pulse LASER devices face a compromise between processing speed and precision due to the formation of dense plasma clouds when high energy pulses are used, leading to increased complexity and cost.
Innovation Solution
A LASER apparatus emitting ultrashort light pulses with high repetition frequency and high energy, utilizing a solid-state LASER oscillator in Mode-Locking operating mode, which reduces the need for multiple amplifiers and eliminates the requirement for a stretcher and compressor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high energy pulses are used to increase processing speed, then productivity is improved, but plasma clouds form which reduce manufacturing precision
Solution Approach 1:
The invention uses periodic pulsed action with ultrashort duration (femtosecond to picosecond range) to deliver high peak power for material processing while allowing complete dissipation of plasma between pulses. The repetition frequency is controlled to ensure the plasma cloud from one pulse dissipates before the next pulse arrives, maintaining precision while achieving high productivity through accumulated processing effect
Solution Approach 2:
The invention dynamically adjusts the temporal characteristics of laser pulses, specifically using ultrashort pulse duration with high peak power followed by complete energy dissipation. This dynamic on-off cycle allows the system to achieve high processing speed during the pulse while ensuring plasma dissipation during the off period, resolving the contradiction between productivity and precision
2Use of energy by moving object
If multiple amplifiers are used to amplify low energy pulses from the oscillator, then the pulse energy is increased, but device complexity increases
Solution Approach 1:
The invention extracts and eliminates the complex multistage amplification chain and associated stretcher-compressor systems from the traditional laser architecture. Instead of progressively amplifying low energy pulses through multiple stages, the system directly generates ultrashort high energy pulses in a single oscillator stage, removing unnecessary components while achieving the required pulse energy
Solution Approach 2:
The invention inverts the conventional approach by not starting with low energy pulses that need amplification, but rather directly generating high energy ultrashort pulses in the oscillator. This reversal of the energy buildup sequence eliminates the need for multiple amplifiers and complex temporal manipulation components
3Use of energy by moving object
If a multistage amplification chain with stretcher and compressor is used, then pulse energy is increased, but manufacturing costs increase
Solution Approach 1:
The invention removes the expensive multistage amplification chain, stretcher, and compressor components from the laser system. By directly generating ultrashort high energy pulses in a single oscillator stage, the system eliminates the need for multiple amplifiers and temporal manipulation components, significantly reducing manufacturing costs while maintaining required pulse energy
Solution Approach 2:
The invention employs a simpler, more cost-effective oscillator design that directly produces high energy ultrashort pulses without requiring expensive multistage amplification infrastructure. The system accepts that the oscillator operates at high intensity from the start rather than building up energy through multiple stages, resulting in lower overall system cost
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 solution achieves high processing efficiency and precision by maintaining operational stability and safety, reducing manufacturing complexity and costs, while allowing for optimized speed and scalability.
Implementation Method 1
utilizing a solid-state LASER oscillator in Mode-Locking operating mode
Implementation Method 2
LASER apparatus for the emission of ultrashort light pulses
Data Source
AI summary
The present invention relates to an emission LASER apparatus of ultrashort light pulses with high energy and high repetition frequency as well as an optoelectronic device that uses this LASER apparatus. In particular, the aforementioned optoelectronic device is particularly suitable for use for precision machining. Furthermore, the present invention also relates to a method of emitting packets of ultrashort light pulses with high energy and high repetition frequency by means of the aforementioned optoelectronic device.