Laser Pulse Energy Correction for Uniform Frequency-Multiplied Output
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Solution Overview
Problem
High-repetition-frequency lasers experience inconsistent output pulse intensity due to heating effects on frequency multiplication crystals, leading to varying energy efficiency between cold and hot states, resulting in nonuniform intensity of the output pulse train.
Innovation Solution
A laser pulse sequence energy correction system comprising a fundamental frequency light source, a control unit, an energy adjusting unit, and a frequency multiplication crystal, where the control unit adjusts the intensity of the fundamental frequency pulse laser based on a prestored energy-time curve to ensure identical energy for each pulse in the multiple frequency pulse laser, addressing the inconsistency by controlling the energy adjusting unit between the light source and the frequency multiplication crystal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high repetition frequency laser output is used, then productivity is improved, but the frequency multiplication crystal heats up causing nonuniform intensity in output pulse train
Solution Approach 1:
The system performs preliminary measurement of the energy-time curve during a calibration phase before actual operation. The control unit stores this curve and uses it to pre-determine the compensation parameters needed for each pulse in the sequence, allowing the system to counteract heating effects before they degrade output uniformity.
Solution Approach 2:
The control unit dynamically adjusts the fundamental frequency pulse laser energy parameter for each pulse based on the prestored energy-time curve. By changing the input energy parameter in accordance with the predicted heating trajectory, the system compensates for temperature-induced efficiency variations in the frequency multiplication crystal.
2Productivity
If frequency multiplication crystal is used in high repetition frequency mode, then productivity is improved, but frequency multiplication efficiency varies between cold and hot states
Solution Approach 1:
The system uses a feedback mechanism where the prestored energy-time curve (obtained from initial measurements) informs real-time adjustment decisions. The control unit continuously monitors the pulse sequence progression and applies compensatory energy adjustments based on the predicted efficiency variations, creating a closed-loop control system that maintains reliable output despite thermal effects.
Solution Approach 2:
The system performs preliminary characterization of the frequency multiplication crystal's thermal behavior by measuring the energy-time curve during calibration. This preliminary data is stored and used to pre-calculate compensation strategies, allowing the system to anticipate and counteract efficiency variations before they affect output quality.
3Stability of the object's composition
If energy adjusting unit is added to correct pulse energy, then output intensity uniformity is improved, but device complexity increases
Solution Approach 1:
The control unit serves multiple functions: it stores the energy-time curve, calculates compensation parameters, controls the energy adjusting unit, and manages the overall pulse sequence. By making the control unit multi-functional, the system avoids adding separate dedicated components for each function, thereby limiting the increase in device complexity while achieving energy uniformity.
Solution Approach 2:
The patent combines the energy measurement, data storage, calculation, and control functions into an integrated control unit. The energy adjusting unit is merged with the existing laser system architecture rather than being a completely separate subsystem. This merging approach reduces overall system complexity compared to having independent dedicated components for each function.
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 consistent intensity of each pulse in the multiple frequency pulse laser output, solving the issue of nonuniformity and providing a simple, reliable, and easily adjustable solution for high-repetition-frequency lasers.
Implementation Method 1
the frequency multiplication crystal is configured to convert the fundamental frequency pulse laser into a multiple frequency pulse laser
Implementation Method 2
fundamental frequency light may heat a frequency multiplication crystal due to high repetition frequency
Data Source
AI summary
The present disclosure provides a laser pulse sequence energy correction system and method. The correction system includes a fundamental frequency light source, a control unit, an energy adjusting unit and a frequency multiplication crystal; the fundamental frequency light source is configured to output a fundamental frequency pulse laser, and the frequency multiplication crystal is configured to convert the fundamental frequency pulse laser into a multiple frequency pulse laser; the control unit prestores an energy-time curve of the multiple frequency pulse laser, and the control unit is configured to control the energy adjusting unit to adjust the intensity of the fundamental frequency pulse laser incident on the frequency multiplication crystal according to the energy-time curve, so that energy of each pulse in the multiple frequency pulse laser is identical. The technical solution of the present disclosure has advantages of simple structure, reliable device, convenient adjustment and the like.