The paper discusses the influence of time profile of microsecond Yb,Er:Glass laser pulse on removal efficiency of cataract lens when performing its laser hydroacoustic processing. It was established that the increase in peak power of the "leading" spike of Yb,Er:Glass microsecond pulse leads to increase in volume of laser-produced steam-gas cavities in liquid, increase in pressure transient amplitude arising in the phase of "collapse-rebound" of the cavity and increase in removed volume of cataract lens as a result of its laser hydroacoustic processing (LHP). Increasing the peak power of the "leading" spike by 2.5÷3 times while keeping the total integral laser pulse energy resulted in a 5÷7-fold increase in the removed volume of human eye lens with III degree of cataract according to L. Buratto classification. The possible multipulse mechanism of cataract lens removal when performing LHP with microsecond Yb,Er:Glass laser pulses is discussed.
The results of strobe-photographic study of steam-gas cavities formation in a bulk of saline as a result of high-power Yb,Er:Glass laser pulses impact are presented. The data on dynamics of laser pulse transmission through the laserproduced steam-gas cavity for different values of the distance h between the fiber end and the cuvette bottom (quartz plate) are presented. It was observed that the steam-gas cavity might be used for effective non-contact delivery of laser radiation to the submerged target: transmission value at maximum steam-gas cavity size reached 0.87 for h = 0.5 mm. The influence of steam-gas cavities parameters on ablation efficiency of eye lens destruction in vitro is also discussed. The ablation of cataract eye lens in liquid environment is more effective than in air. The efficiency of eye lens ablation decreases with the increase of h . The maximal values of ablation efficiency (2.14·10-3 mm3/pulse) were obtained in the case of underwater ablation at h = 0 mm.
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