Laser Amplification System With Loss Modulator For Pulse Control
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Solution Overview
Problem
Ultrashort pulse laser systems struggle to provide retrievable laser pulses with predefined pulse duration and energy, as existing solutions result in significant energy boosts during state changes and cannot vary pulse repetition rates and energies continuously and instantaneously.
Innovation Solution
A laser amplification system utilizing a loss modulator that adjusts amplification based on the instantaneous gain of the laser medium, allowing for closed-loop or open-loop control to adapt the amplification process, ensuring minimal pulse energy boost and continuous, time-critical variation of pulse repetition rates and energies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a loss modulator is used to control amplification in ultrashort pulse laser systems, then pulse energy and repetition rate can be adjusted, but significant energy boosts occur during state changes
Solution Approach 1:
The patent determines the instantaneous gain of the laser medium before the amplification process and uses this information to pre-adjust the loss modulator settings. This preliminary action allows the system to prepare the optimal amplification conditions in advance, preventing excessive energy boosts during pulse retrieval while maintaining adaptability in pulse energy control.
2Productivity
If existing laser amplification systems are used, then laser pulses can be generated, but they cannot vary pulse repetition rates and energies continuously and instantaneously
Solution Approach 1:
The patent implements a feedback mechanism where the instantaneous gain of the laser medium is continuously monitored and used to control the loss modulator. This real-time feedback enables the system to respond dynamically to changing requirements, allowing continuous and instantaneous variation of pulse repetition rates and energies without sacrificing retrieval speed.
3Measurement precision
If measurement of output signal is used for loss modulation, then pulse parameters can be controlled, but control only takes effect for subsequent pulses with delay
Solution Approach 1:
Instead of measuring the output signal after amplification, the patent determines the instantaneous gain of the laser medium before the amplification process. This preliminary determination of the gain state allows the loss modulator to be adjusted in advance, so the control takes effect for the current pulse rather than being delayed to subsequent pulses.
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 the generation of laser pulses with precise pulse duration and energy, minimizing initial pulse energy deviations and allowing for instantaneous and continuous adjustment of pulse repetition rates, addressing the limitations of prior art.
Implementation Method 1
laser pulses are generated by a laser source and amplified by a downstream gain medium, wherein the amplification is configured such that it can be influenced by the loss modulator
Implementation Method 2
loss generation by the loss modulator is controlled by closed-loop or open-loop control based on the determined instantaneous gain
Data Source
AI summary
The invention relates to a laser amplification system for generating retrievable laser pulses having at least one laser source, in particular with a pulse selector arranged downstream thereof for the targeted selection of amplifiable laser pulses, a laser medium for amplifying laser pulses generated by the laser source and a loss modulator, wherein the loss modulator is arranged and connected such that said modulator modulates the amplification of the laser pulses by the laser medium by loss generation so that the retrievable laser pulses are provided with a predefined pulse time and/or pulse energy. Before an amplification process for one of the laser pulses, the current amplification of the laser medium is determined and the loss generation is controlled by the loss modulator depending on the current amplification of the laser medium.