7 May 2009 Chirped pulse Raman amplification in plasma: high gain measurements
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Abstract
High power short pulse lasers are usually based on chirped pulse amplification (CPA), where a frequency chirped and temporarily stretched "seed" pulse is amplified by a broad-bandwidth solid state medium, which is usually pumped by a monochromatic "pump" laser. Here, we demonstrate the feasibility of using chirped pulse Raman amplification (CPRA) as a means of amplifying short pulses in plasma. In this scheme, a short seed pulse is amplified by a stretched and chirped pump pulse through Raman backscattering in a plasma channel. Unlike conventional CPA, each spectral component of the seed is amplified at different longitudinal positions determined by the resonance of the seed, pump and plasma wave, which excites a density echelon that acts as a "chirped" mirror and simultaneously backscatters and compresses the pump. Experimental evidence shows that it has potential as an ultra-broad bandwidth linear amplifier which dispenses with the need for large compressor gratings.
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G. Vieux, X. Yang, A. Lyachev, B. Ersfeld, J. Farmer, E. Brunetti, M. Wiggins, R. Issac, G. Raj, D. A. Jaroszynski, "Chirped pulse Raman amplification in plasma: high gain measurements", Proc. SPIE 7359, Harnessing Relativistic Plasma Waves as Novel Radiation Sources from Terahertz to X-Rays and Beyond, 73590R (7 May 2009); doi: 10.1117/12.820983; https://doi.org/10.1117/12.820983
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