Strong optical scattering by femtosecond laser induced microbubbles inside water and other microscopic observations / Sayed Ahmed Islam Sanny
Nonlinear interactions of focused femtosecond laser with water can provide interesting optical phenomena, most commonly, laser induced breakdown in water which creates plasma, self-focusing or filamentation because of loose geometrical focusing condition, white light generation and blue shifted by p...
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| フォーマット: | 学位論文 |
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2018
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| オンライン･アクセス: | http://studentsrepo.um.edu.my/9372/1/Sayed_Ahmed_Islam_Sanny.pdf http://studentsrepo.um.edu.my/9372/6/sayed.pdf http://studentsrepo.um.edu.my/9372/ |
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| 要約: | Nonlinear interactions of focused femtosecond laser with water can provide interesting optical phenomena, most commonly, laser induced breakdown in water which creates plasma, self-focusing or filamentation because of loose geometrical focusing condition, white light generation and blue shifted by plasma, conical emission and associated spectra, as well as creation of optical cavitation bubbles and their motions inside water. However, in our work, in addition to the well-known phenomena we have observed a new kind of colorful optical scattering flash from femtosecond laser induced microbubble surface. A closer look under the microscopic observation of the focused region of femtosecond laser pulse leads us to observe this scattering. Additionally, in this work, we also have discussed the nonlinear optical process including our new finding phenomena to elucidate the underlying physical mechanisms and laser induced bubble mechanism from the micro level observational point of view. |
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