الفهرس 
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Abstract
Short pulsed laser with high power generated by the Nd:YAG laser can be used for intraocular surgery, where it employs the shock and acoustic waves generated by ionization and plasma formation to cut members and other structures inside the eye. Such phenomenon is known as Laser-Induced Breakdown (LIB) and it becomes a widely adopted technique when using with spectroscopic measurements for medical application as well as environmental purposes. For example, in ophthalmology, the hot plasmas produced by LIB are used as a surgical ool to cut intraocular tissue. Therefore, the present work aims to study he phenomena of LIB in bulk-distilled water where it is a reasonable stimulant for vitreous humor of eye. Such simulation helps us more to understand the interaction between laser and vitreous humor of eye, which in turn leads to better performance of eye surgery. Two separate Q-Switched Nd:YAG laser operating at their fundamental wavelength in collinear configuration mode are used to generate the plasma in bulk water, which in turn investigated by optical emission spectroscopy (OES) technique. The plasma is generated via double pulse laser source to reduce the duration of continuum spectrum associated with conventional SP-LIBS therefore, enhancing the emission intensity of the water constituents The role of experimental parameters such as inter-pulse delay between the two laser pulses, laser pulse energy as well as the detection time window for enhancing the plasma emission and optimizing the experimental condition have been studied to investigate the temporal evolution of laser induced plasma in bulk water.