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500 MW peak power degenerated optical parametric amplifier delivering 52 fs pulses at 97 kHz repetition rate

Friedrich Schiller University Jena, Institute of Applied Physics, Albert-Einstein-Str. 15, 07745 Jena, Germany.
Optics Express (Impact Factor: 3.49). 07/2008; 16(12):8981-8. DOI: 10.1364/OE.16.008981
Source: PubMed

ABSTRACT We present a high peak power degenerated parametric amplifier operating at 1030 nm and 97 kHz repetition rate. Pulses of a state-of-the art fiber chirped-pulse amplification (FCPA) system with 840 fs pulse duration and 410 microJ pulse energy are used as pump and seed source for a two stage optical parametric amplifier. Additional spectral broadening of the seed signal in a photonic crystal fiber creates enough bandwidth for ultrashort pulse generation. Subsequent amplification of the broadband seed signal in two 1 mm BBO crystals results in 41 microJ output pulse energy. Compression in a SF 11 prism compressor yields 37 microJ pulses as short as 52 fs. Thus, pulse shortening of more than one order of magnitude is achieved. Further scaling in terms of average power and pulse energy seems possible and will be discussed, since both concepts involved, the fiber laser and the parametric amplifier have the reputation to be immune against thermo-optical effects.

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    • "The ultrabroad bandwidth of degenerate OPA can be broadened by use of chirped pump pulse [22], [23], [40]–[43]. We shall analyze analytically a gain bandwidth of collinear OPA at degeneracy pumped by chirped pulse. "
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    • "Such a laser source will open up new possibilities in applications ranging from fundamental science to industrial production, such as high-speed high-precision micromachining [37]. In addition, the high repetition rate and the high pulse energy can be transferred to other wavelength ranges and/or significantly shorter pulse durations by means of optical parametric amplification [38]–[40] increasing the application potential even further. "
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    ABSTRACT: We review the main challenges and give design guidelines for high-peak-power high-average-power fiber-based chirped-pulse amplification (CPA) systems. It is clearly pointed out that the lowest order fiber nonlinearity (NL), namely the self-phase modulation, limits the scalability of high-energy ultrashort pulse fiber amplifiers. Therefore, a distinguished difference arises between the consequences of accumulated nonlinear phase originating from the pulse envelope and initial weak modulations, resulting in a strong recommendation to operate an amplification system as linearly as possible in order to generate high-contrast pulses. Low-NL rare-earth-doped fibers, such as the recently available designs of photonic crystal fibers, are the key element for successful peak power scaling in fiber laser systems. In this paper, we present a detailed analysis and optimization of the extraction characteristics in connection with the accumulated nonlinear phase in such extreme fiber dimensions. Consequently, millijoule pulse energy femtosecond pulses at repetition rates in the 100 kHz range have already been demonstrated experimentally in a Yb-fiber-based CPA system that has even further scaling potential.
    IEEE Journal of Selected Topics in Quantum Electronics 02/2009; 15(1-15):159 - 169. DOI:10.1109/JSTQE.2008.2010244 · 3.47 Impact Factor
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    • "Most commonly a broadband signal for parametric amplification is generated either by filamentation [3] [4] or spectral broadening via selfphase modulation in optical fibers [6]. In [12] we have presented spectral broadening with a small fraction of the FCPA output which limits the achievable pulse duration, since the temporal pulse shape is distorted due to nonlinearity during the amplification process. To have a clean temporal pulse profile for spectral broadening we decided to use the Yb:KGW oscillator pulses directly. "
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    ABSTRACT: We present a degenerated-parametric amplifier with gigawatt peak power operating at 1030 nm and 30 kHz repetition rate. Pulses of a fiber chirped pulse amplification (FCPA) system with 650 fs pulse duration and 1 mJ pulse energy are frequency doubled and used as pump source for a two stage optical parametric amplifier. Both the FCPA and the optical parametric amplifier (OPA) are seeded by the same YB:KGW oscillator. Spectral broadening of the OPA seed signal in a short-polarization-maintaining-step-index fiber creates enough bandwidth for sub 30 fs pulse generation, while temporal synchronization of pump and signal is realized by means of a multipass cell in the OPA signal beam path. Parametric amplification of the broadband signal takes place in two 1 mm BBO crystals. Pulse compression via chirped mirrors yields 81 muJ pulses as short as 29 fs. The corresponding pulse peak power is estimated to be as large as 2 GW. Together with the good beam quality (measured M2
    Proceedings of SPIE - The International Society for Optical Engineering 02/2009; DOI:10.1117/12.808761 · 0.20 Impact Factor
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