Strong optical scattering by femtosecond laser induced microbubbles inside water and other microscopic observations / Sayed Ahmed Islam Sanny

Sayed Ahmed, Islam Sanny (2018) Strong optical scattering by femtosecond laser induced microbubbles inside water and other microscopic observations / Sayed Ahmed Islam Sanny. Masters thesis, University of Malaya.

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Abstract

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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