Abstract
We report an experimental study of the beat-wave excitation of plasma waves using a short pulse, high intensity CO <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> laser with two colinearly propagating beams to excite the fast wave (v <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">p</sub> Ƀ c) in a long-scale-length underdense plasma. Maximum plasma wave amplitudes n <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> /n <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> Ƀ 0.19 with effective longitudinal electric field gradients of Ƀ 6 GV/m over a distance of 0.5 mm were achieved in these experiments.
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