A 100 J DiPOLE amplifier with the capability to have arbitrary pulse shaping has been successful installed at XFEL Hamburg for High Energy Density Physics. We have demonstrated 70 J at 1 Hz and has been delivered to the target chamber for experiment using frequency doubled energy at 60% efficiency. During the experimental period the system was run for 24 hours over a period of seven days.
The development of low loss, small size and flexible waveguides is one of the most challenging issues of THz research due to the poor characteristics of both metal and dielectrics in this frequency range. Hollow core tube lattice fibers (HCTLFs) have been recently proposed and experimentally demonstrated to overcome this problem. However, they require very large hollow core size leading to big and hardly flexible fibers. Scaling law analysis plays an important role in determining the best trade-off between low loss and small fiber diameter. The dependence of the confinement on frequency and core radius are here numerically investigated. Results show that confinement loss exhibits a stronger dependence on core size and frequency with respect to other hollow core fibers proposed for THz waveguiding, such as Bragg, Tube, and Kagome fibers.
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