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

Solid-based surface high-harmonic generation from a tape is experimentally studied. By operating at mildly relativistic normalized laser strengths a{sub 0}≲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 ∼6.5×10{sup −7}, divergence ∼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.
Authors:
 [1] ;  [2] ; ; ; ; ; ; ;  [1] ;  [1] ;  [2]
  1. Lawrence Berkeley National Lab, Berkeley, California 94720 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
22218255
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 4; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; BEAMS; CONFIGURATION; CORRELATIONS; EFFICIENCY; ENERGY CONVERSION; FREE ELECTRON LASERS; GAIN; HARMONIC GENERATION; HARMONICS; PLASMA GUNS; PULSES; RELATIVISTIC RANGE; ROUGHNESS; SURFACES; ULTRAVIOLET SPECTRA; WAVELENGTHS