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Coherent beam combining of high-brightness tapered semiconductor optical amplifiers

Philipp Albrodt 1
1 Laboratoire Charles Fabry / Lasers
LCF - Laboratoire Charles Fabry
Abstract : Abstract Compact and efficient high-brightness semiconductor laser systems are demanded for direct and indirect applications. Power scaling beyond the limitations of material damage threshold requires combining multiple beams from independent emitters. Unlike other beam combining techniques, coherent beam combining (CBC) allows power and brightness scaling while maintaining all physical properties of the individual emitters and is therefore the ideal approach for brightness scaling. As they provide high powers with good beam quality, semi-conductor tapered lasers and amplifiers are a good starting block for power and brightness scaling in coherent beam combining setupsThis work targets the development of simple and robust coherent beam combining setups based on a few high power tapered amplifiers with optimized design. Different amplifier designs developed and fabricated within the framework of common research activities with the Ferdinand-Braun-Institut (Berlin, Germany) are investigated in details and tested in coherent beam combining architectures. Both continuous wave and pulsed quasi-continuous wave CBC is demonstrated and investigated at high powers. The achieved maximum power (23 W in QCW) in a nearly diffraction limited beam compares favourably to previous work on CBC with semiconductor emitters.The usefulness of CBC for applications requiring high brightness is demonstrated by an increased nonlinear conversion efficiency in single pass SHG setups. Furthermore, the work also targets the development of integrated modular setups with reduced footprint and improved stability.
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  • HAL Id : tel-02881046, version 1

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Philipp Albrodt. Coherent beam combining of high-brightness tapered semiconductor optical amplifiers. Optics [physics.optics]. Université Paris-Saclay, 2020. English. ⟨NNT : 2020UPASO001⟩. ⟨tel-02881046⟩

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