Jungwirth, Julian

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Jungwirth
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Julian
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615  fs pulses with 17  mJ energy generated by an Yb:thin-disk amplifier at 3  kHz repetition rate

2016, Fischer, Jonathan, Heinrich, Alexander-Cornelius, Maier, Simon, Jungwirth, Julian, Brida, Daniele, Leitenstorfer, Alfred

A combination of Er/Yb:fiber and Yb:thin-disk technology produces 615 fs pulses at 1030 nm with an average output power of 72 W. The regenerative amplifier allows variation of the repetition rate between 3 and 5 kHz with pulse energies from 13 to 17 mJ. A broadband and intense seed provided by the compact and versatile fiber front-end minimizes gain narrowing. The resulting sub-ps performance is ideal for nonlinear frequency conversion and pulse compression. Operating in the upper branch of a bifurcated pulse train, the system exhibits exceptional noise performance and stability.

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Magnetomechanical properties of a high-temperature Ni-Mn-Ga magnetic shape memory actuator material

2014, Pagounis, Emmanouel, Laptev, Aleksej, Jungwirth, Julian, Laufenberg, Markus, Fonin, Mikhail

A Ni–Mn–Ga single crystal with a phase transformation temperature above 350 K is investigated. The material demonstrates a magnetic field-induced strain (MFIS) of 7% at room temperature and of 4.2% at 350 K. The temperature dependence of the magnetic anisotropy and of the saturation magnetization has been studied in detail. At 350 K a maximum magnetic stress of 1.6 MPa and a twinning stress of 0.6 MPa were measured, explaining the MFIS obtained at elevated temperatures.