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Analysis on FM-to-AM conversion induced by spatial filter in a high-power laser system
Authors:Hujie Zhang  Shenlei Zhou  Youen Jiang  Jinghui Li  Wei Feng  and Zunqi Lin
Institution:1National Laboratory on High Power Laser and Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China 2Shanghai Institute of Laser and Plasma,Shanghai 201800,China
Abstract:In order to avoid stimulated Brillouin scattering and smooth the final focal spot that reaches the D-T capsule,spectral broadening is essential.However,the modulation of spectral structure might result in frequency-to-amplitude modulation(FM-to-AM) conversion.The spatial filter pinhole is used to cut off the high-frequency transmission laser,and to ensure the desired pass.Improper parameter of pinhole would lead a negative impact.Using the spatial filter pinhole,we analyze the characteristic of intensity modulation using several pinholes of improper parameters.We then compare these results with the intensity modulation obtained from an experiment.Experimental diagnosis and design of an appropriate pinhole parameter would be highly beneficial to the field of high-power lasers.
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