［イベント］第182回オプティクス教育研究セミナー「Design and Development of a Femtosecond Optical Pulse Shaping System for Enhanced Emission Intensity of Air Plasma」を開催します（2/25）

※講演は英語で行われます。

講師：Chen-Min Tsai (National Taiwan Univ., Taiwan)
日時：2月25日(火)16:00～17:00 ※日程が再度変更となりました
場所：陽東キャンパス オプティクス教育研究センター 4Fコラボレーションルーム（オンライン併用）
対象：学外の方の参加も可能です。興味のある皆様のご参加をお待ちしています。

Femtosecond laser emits extremely short and high-energy pulses. When the laser pulse is focused into air, its intense electric field ionizes the air molecules and generates air plasma. In addition to the pulse intensity affecting plasma emission intensity, the shape of the pulse in the time domain also plays an important role. Typically, femtosecond laser pulse has a Gaussian distribution in the time domain, but this may not be the best condition for generating the strongest plasma emission. To change the femtosecond pulse shape, optical pulse shaping is one of the effective methods. The system utilizes dispersion elements and spatial light modulator (SLM) to perform phase modulation on different frequency components of laser pulse, thereby able to altering the pulse shape. In this study, we proposed and demonstrated to utilize optical pulse shaping system to alter the laser pulse shape in order to enhance plasma emission intensity. Additionally, we employed an iterative algorithm to identify the best solution of modulated phase pattern on SLM. In the result, we successfully increased the plasma intensity to 1.7 times compared to the plasma without shaping.

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