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![[Faculty of Physics ] Вторая гармоника. Нелинейная восприимчивость. Фазовый синхронизм.](https://sun9-4.userapi.com/impg/7cmOL8hnGgC8ucxCDYUiiy1s4trn_UnlsYNL_A/poSRRiMEd4A.jpg?size=320x240&quality=95&keep_aspect_ratio=1&background=000000&sign=9f04cd4fe26e3fbc06d5fd28bb0024b2&c_uniq_tag=jzc5I6VR6YAwJUz11BfeTgM-Kb50CR3A1o4QSTdTwCU&type=video_thumb)
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