High-peak-power surface high-harmonic generation at extreme ultra-violet wavelengths from a tape

作者：Shaw B H; van Tilborg J; Sokollik T; Schroeder C B; McKinney W R; Artemiev N A; Yashchuk V V; Gullikson E M; Leemans W P^*

来源：Journal of Applied Physics, 2013, 114(4): 043106.

DOI：10.1063/1.4816574

Solid-based surface high-harmonic generation from a tape is experimentally studied. By operating at mildly relativistic normalized laser strengths a(0) less than or similar to 0.2, harmonics up to the 17th order are efficiently produced in the coherent wake emission (CWE) regime. CWE pulse properties, such as divergence, energy, conversion efficiency, and spectrum, are investigated for various tape materials and drive laser conditions. A clear correlation between surface roughness and harmonic beam divergence is found. At the measured pulse properties for the 15th harmonic (conversion efficiency similar to 6.5 x 10 (7), divergence similar to 7 - 15 mrad), the 100-mJ-level drive laser produces several MWs of extreme ultra-violet pulses. The spooling tape configuration enables multi-Hz operation over thousands of shots, making this source attractive as a seed to the few-Hz laser-plasma-accelerator-driven free-electron laser (FEL). Models indicate that these CWE pulses with MW level powers are sufficient for seed-induced bunching and FEL gain.

• 出版日期2013-7-28