Fiber chirped-pulse amplification system emitting 38 GW peak power

Friedrich-Schiller-University Jena, Institute of Applied Physics, Jena, Germany.
Optics Express (Impact Factor: 3.49). 01/2011; 19(1):255-60. DOI: 10.1364/OE.19.000255
Source: PubMed


We report on the experimental demonstration of a fiber chirped- pulse amplification system capable of generating nearly transform-limited sub 500 fs pulses with 2.2 mJ pulse energy at 11 W average power. The resulting record peak power of 3.8 GW could be achieved by combining active phase shaping with an efficient reduction of the acquired nonlinear phase. Therefore, we used an Ytterbium-doped large-pitch fiber with a mode field diameter of 105 µm as the main amplifier.

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    • "To increase the peak power of the final combined beam, there is the need to use large core microstructured fibers [8]. However, as their core size increase, fibers become less flexible inorder to avoid losses. "
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    ABSTRACT: The Coherent Amplifying Network laser is based on an array of thousands of active laser fibers coherently combined to generate high peak power pulses at high repetition rate. To achieve such a massive network, new combination architectures are presented here. They are based on implementing a spherical array of amplifying fibers thus removing the need for transport fibers from the initial scheme. These designs present an advantage in term of scalability leading to significant reduction of the temporal fluctuations compared to those of a conventional high peak power laser. Noise evolution with fiber number is calculated using a pertubative analysis of each channel parameters (phase, signal intensity, beam profile).
    Applied Optics 05/2015; 54(15):4640-4645. DOI:10.1364/AO.54.004640 · 1.78 Impact Factor
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    • "Solidcore photonic crystal fibers (PCFs) are capable of maintaining single-mode operation even for very large core diameters [16] within a broad bandwidth [17]. Among various PCFs, the so-called large-pitch fiber (LPF) has achieved a record peak power with nearly diffraction-limited beam quality [5] [18] [19]. Nevertheless, the PCF fabrication requires sophisticated processing steps [20], and the hollow channels in PCFs require complex procedures for cutting, splicing and tapering, which make monolithic integration very difficult compared to conventional all-solid fibers. "
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    ABSTRACT: We demonstrate amplification experiments using a very large mode area Yb-doped doubleclad fiber with 100 μm aluminum-cer codoped core and 440 μm pump cladding realized by high aluminum codoping. The material for core and pump cladding was fabricated by reactive powder sinter technology. A high numerical aperture (NA) of the pump cladding with NA = 0.21 and a low one of the core with NA = 0.084 could be realized. Using a 0.55 m short fiber sample as the main amplifier in a three-stage ns pulsed fiber master oscillator power amplifier system we achieved 3 ns, 2 mJ output pulses with 360 kW peak power limited by the available pump power. Stimulated Raman scattering effects and amplified spontaneous emission were successfully suppressed.
    Laser Physics Letters 11/2014; 12(1):015103. DOI:10.1088/1612-2011/12/1/015103 · 2.46 Impact Factor
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    • "Considering an overall throughput efficiency of ∼54%, pulses with 76-W average power, 1-μJ pulse energy and 2.5-MW peak power were obtained. In 2009, the output power and pulse peak power were further increased by using dispersion matched grating-pair stretcher and compressor structure together with high pump LD power [18], [19]. The seed source in this case adopted a 1.03 μm mode-locked Yb:YAG laser which delivered transform-limited pulses with pulse duration of 180 fs and repetition rate of 40 MHz. "
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    ABSTRACT: Three kinds of pulse amplification techniques including chirped-pulse amplification (CPA), parabolic pulse amplification, and divided-pulse amplification (DPA) based on rare-earth doped fiber gain medium are reviewed. Large core area fiber and cladding-pumping technique compose the foundation of high average power, high pulse energy fiber CPA technology. Femtosecond pulses have been demonstrated at average powers of up to 830 W, pulse energies of up to 2.2 mJ and compressed pulse duration of 23 fs from different fiber CPA systems. The state-of-the-art performance of fiber CPA system to date is the simultaneous generation of 530 W, 1.3 mJ compressed femtosecond pulses at 400 kHz repetition rate. The balance between fiber gain, dispersion and nonlinearity is required for the self-similar propagation and thus the formation of pulses with parabolic intensity profile. Sub-33 fs pulses were demonstrated from a gain-cascaded parabolic amplification system. A newly emerging DPA technique is also reviewed. In addition, the applications of pulsed fiber amplifiers in the areas of supercontinuum generation and material micromachining system are also introduced.
    IEEE Journal of Selected Topics in Quantum Electronics 09/2014; 20(5):1-13. DOI:10.1109/JSTQE.2014.2308396 · 2.83 Impact Factor
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