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Parallelgeschaltete Faser-Laser.
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Fiber lasers in parallel operation.
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Die Erhöhung der Ausgangsleistung von Ultrakurzpulslasern ist ein wichtige Aufgabenstellung der modernen Laserphysik. Am Helmholtz-Institut Jena beschäftigen wir uns dazu mit faser-basierten Lasersystemen.
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Scaling up the average power and pulse energy of ultra-short-pulse lasers is one of the main topics in laser physics. At Helmholtz Institute Jena, we are interested in fiber-based laser sources. A variety of approaches are investigated, which can and are being combined in a single system to provide ultra-short high-energy pulses at high repetition rates and average powers. This makes these systems suitable for applications like high harmonic generation (HHG) that require high peak powers to work, while the high repetition rates compensate for the low conversion efficiency.
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Ein weiteres Forschungsfeld ist die Entwicklung von neuen Faserdesigns mit dem Ziel, die Kerngröße und damit die möglichen Pulsenergien zu skalieren und dabei die hohen Durch­schnitts­leistungen zu erhalten, die Fasern auszeichnen.
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Another area of interest is the development of advanced fiber designs. The goal is to increase the fundamental-mode area of the fibers to allow for scaling up the pulse energy while preserving the high average powers that distinguish fiber laser. One of the designs developed in our group is the large-pitch fiber (LPF). Due to its specific air-hole structure, the fundamental mode experiences an improved excitation at the fiber input and a preferential ampli­fication compared to unwanted higher-order modes, thus, improving the beam quality at the output. The simplicity of this non-resonant fiber design ensures an excellent reproducibility and scalability of the core diameters currently ranging up to 130 µm. These values represent the largest ytterbium-doped fibers today that are still able to maintain single-mode operation. So far, average powers of hundreds of watts at millijoule-level pulse energies could already be demonstrated with this type of fibers [2].
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Ein weiteres Forschungsfeld ist die Entwicklung von neuen Faserdesigns mit dem Ziel, die Kerngröße und damit die möglichen Pulsenergien zu skalieren und dabei die hohen Durch­schnitts­leistungen zu erhalten, die Fasern auszeichnen.
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Another area of interest is the development of advanced fiber designs. The goal is to increase the fundamental-mode area of the fibers to allow for scaling up the pulse energy while preserving the high average powers that distinguish fiber laser. One of the designs developed in our group is the large-pitch fiber (LPF). Due to its specific air-hole structure, the fundamental mode experiences an improved excitation at the fiber input and a preferential ampli­fication compared to unwanted higher-order modes, thus, improving the beam quality at the output. The simplicity of this non-resonant fiber design ensures an excellent reproducibility and scalability of the core diameters currently ranging up to 130 µm. These values represent the largest ytterbium-doped fibers today that are still able to maintain single-mode operation. So far, average powers of hundreds of watts at millijoule-level pulse energies could already be demonstrated with this type of fibers [2].
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Aufgrund des kleinen Durchmessers des Laserstrahls innerhalb von Faserverstärkern treten nicht gewünschte Effekte wie Selbstphasen­modulation oder Zerstörung der Faser bei Verstärkung von ultra­kurzen Pulsen schon bei kleinen Pulsspitzenleistungen auf.
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When working with ultrashort pulse fiber amplifiers, unwanted effects like self-phase modulation or optically induced damage can already occur at low peak intensities and, thus, at low pulse energies due to the confinement of the light in small signal cores. To mitigate these effects, spectrally dispersive elements are used to stretch the pulses prior amplification and recompress them afterwards. This method is called chirped-pulse amplification (CPA). The dispersion can be achieved with different elements such as optical gratings or prisms. With this architecture, femtosecond pulses can be stretched up to the nanosecond regime, thus allowing us to build ultra­short-pulse fiber lasers with the highest peak powers to date [1].
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Ein weiteres Forschungsfeld ist die Entwicklung von neuen Faserdesigns mit dem Ziel, die Kerngröße und damit die möglichen Pulsenergien zu skalieren und dabei die hohen Durch­schnitts­leistungen zu erhalten, die Fasern auszeichnen.
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Another area of interest is the development of advanced fiber designs. The goal is to increase the fundamental-mode area of the fibers to allow for scaling up the pulse energy while preserving the high average powers that distinguish fiber laser. One of the designs developed in our group is the large-pitch fiber (LPF). Due to its specific air-hole structure, the fundamental mode experiences an improved excitation at the fiber input and a preferential ampli­fication compared to unwanted higher-order modes, thus, improving the beam quality at the output. The simplicity of this non-resonant fiber design ensures an excellent reproducibility and scalability of the core diameters currently ranging up to 130 µm. These values represent the largest ytterbium-doped fibers today that are still able to maintain single-mode operation. So far, average powers of hundreds of watts at millijoule-level pulse energies could already be demonstrated with this type of fibers [2].