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- W830343468 abstract "When a Q-switched Nd:YAG laser is focused in a medium, breakdownassociated with the formation of a plasma occurs, and shock wavesare generated in the medium. The appearance of this phenomena hasbeen recorded using ultra-high speed photography the event beingilluminated by a dye laser. The measurement of the changes ofparameters through the shock region were visualized by usingshadowgraph and interferometry techniques and calculated using Abel.inversion, assuming that the thermal conductivity' and the viscosityof the medium were negligible. The velocity of the shock in air wasfound to be greater than the sound speed, which was in agreementwith previous studies. The net peak pressure produced from thepassage of the shock wave in air was in the range 0.1 - 0.9 atm(associated with radii between 5 - 1.5 mm). The measured velocity ofsound in the liquids being investigated showed good agreement withthe accepted values. The pressure produced as a result of the shocktransient in water was in the range 10 - 30 atm, corresponding tothe radii of the shock wave between 6 - 2 mm. A series of measurements on bovine vitreous humour showed the velocity of sound to be1510 m/s with 5% accuracy. Spherical shock waves were formed in arange of organic liquids' (chloroform, benzene: and glycerol)whenthe laser was focused in the body of the liquids. In order tounderstand the generation mechanism of acoustic waves on solidsurfaces, experiments were performed by immersing the solid body(perspex and aluminium plates) in water. The hemispherical shock viwavestructure comprising the longitudinal, shear, and Rayleigh(Stoneley) waves was generated as a result of the interaction of thefocused laser with.the solid-liquid boundary. These waves wereidentified by their velocities which were in excellent agreementwhen compared with the results of previous workers. A series ofexperiments was carried out to study the shock wave formation in thecapsulotomy procedure. In this operation a Q-switched Nd laser isused to rupture the capsule membrane following implantation of anintraocular lens (IOL) in the eye. The effect of the solid lens wasstudied compared with the free membrane on a model eye structure." @default.
- W830343468 created "2016-06-24" @default.
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- W830343468 date "1987-01-01" @default.
- W830343468 modified "2023-09-23" @default.
- W830343468 title "Laser generation of shock waves in different media" @default.
- W830343468 hasPublicationYear "1987" @default.
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