Hybrid Fiber-MOPA With Multi-Pass Thin-Disk Amplifier
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Solution Overview
Problem
Fiber MOPA systems face limitations due to nonlinear effects in small core diameter amplifier fibers, leading to spectral broadening and energy transfer issues, and are difficult to package due to inflexibility and photodarkening in high-power applications, limiting output energies and requiring chirped pulse amplification.
Innovation Solution
A multi-pass thin-disk amplifier is used as a final power amplifier stage, eliminating the need for chirped pulse amplification and allowing for packaging comparable to low-power systems, with multiple incidences of radiation and pump radiation on a thin-disk gain-medium to achieve high output energies without degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If small core diameter amplifier fibers are used, then fiber MOPA systems can be implemented with high gain and low saturation energy, but nonlinear effects cause spectral broadening and energy transfer issues
Solution Approach 1:
The amplifier system is divided into multiple stages: fiber preamplifier stages for initial amplification, followed by a thin-disk power amplifier stage for final high-power output. This segmentation allows each stage to operate in its optimal regime, avoiding nonlinear effects in the high-power stage while achieving high overall output power.
Solution Approach 2:
The thin-disk amplifier acts as an intermediary between the fiber preamplifier and the final output. It receives preamplified light at its small signal port and provides additional amplification to reach high power levels without subjecting the fiber to damaging nonlinear effects.
2Power
If high-power fiber amplifiers are used, then output energy can be increased, but photodarkening and inflexibility make packaging difficult
Solution Approach 1:
The system separates the high-power amplification function into a distinct thin-disk module, which can be packaged separately from the fiber components. This modular approach allows the fiber MOPA to maintain its compact packaging advantages while achieving high output energies through the thin-disk stage.
3Power
If chirped pulse amplification is used to increase output energy, then energy levels can be raised, but system complexity and footprint increase
Solution Approach 1:
The patent extracts the high-power amplification function from the fiber MOPA system and places it in a separate thin-disk amplifier stage. This eliminates the need for complex chirped pulse amplification arrangements within the fiber system, maintaining simplicity while achieving high output energies.
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 solution enables output energies above microjoules without chirped pulse amplification, avoids photodarkening, and maintains a compact footprint, preserving the advantages of fiber MOPAs while achieving high power levels.
Implementation Method 1
a source of optical pump radiation for energizing the thin-disk gain-medium
Implementation Method 2
a multi-pass thin-disk amplifier is arranged for power amplifying the pre-amplified laser-radiation pulses
Data Source
AI summary
A master oscillator power-amplifier stages includes multiple stages of fiber-amplification with a final power amplifier stage in the form of a multi-pass amplifier. With a thin-disk gain medium in one example the thin-disk amplifier includes a common optical arrangement for providing multiple incidences of radiation to be amplified and multiple incidences of a pump-radiation beam on the thin-disk gain medium.