Variable pulsewidth erbium:YAG laser ablation of the ureter and urethra in vitro and in vivo: optimization of the laser fluence, pulse duration, and pulse repetition rate

2004 ◽  
Author(s):  
Nathaniel M. Fried ◽  
Zelalem Tesfaye ◽  
Albert M. Ong ◽  
Koon H. Rha ◽  
Pooya Hejazi
Keyword(s):  
Laser Ablation ◽  
Pulse Duration ◽  
Laser Fluence ◽  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
Pulse Repetition ◽  
Erbium:Yag Laser

Laser ablation efficiency during the production of Ag nanoparticles in ethanol at a low pulse repetition rate (1–10 Hz)

2016 ◽  
Vol 13 (10) ◽  
pp. 106002 ◽  
Author(s):  
M A Valverde-Alva ◽  
T García-Fernández ◽  
E Esparza-Alegría ◽  
M Villagrán-Muniz ◽  
C Sánchez-Aké ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Ag Nanoparticles ◽  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
Pulse Repetition ◽  
Ablation Efficiency

In vitro study of cataract extraction by bursts of microsecond 1.54-mm laser pulses

2022 ◽  
Vol 52 (1) ◽  
pp. 69-77
Author(s):  
A V Belikov ◽  
S N Smirnov ◽  
Yu N Batov ◽  
A B Gubin ◽  
Yu B Pirozhkov ◽  
...  
Keyword(s):  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
Video Recording ◽  
Average Power ◽  
Cataract Extraction ◽  
Pulse Repetition ◽  
Glass Laser ◽  
First Time ◽  
Pulse Spacing

Abstract Laser extraction of a model porcine eye cataract has been performed for the first time in an in vitro experiment using a 1.54-μm Yb,Er : glass laser generating bursts of microsecond pulses. We used effective pulse repetition rates from 36 to 75 Hz and average laser output powers from 3.9 to 5.25 W. The results demonstrate for the first time that, at an effective pulse repetition rate of 45 Hz, burst repetition rate of 15 Hz, three microsecond pulses per burst, and a burst energy from 260 to 265 mJ, the laser step duration in cataract extraction is 130 plusmn; 10 s, which is comparable to the ultrasonic phacoemulsification and laser extraction time in the case of a Nd : YAG laser emitting at 1.44 μm. Acoustometry and high speed video recording of hydroacoustic processes accompanying interaction of water with 1.54-μm radiation from the Yb, Er : glass laser generating bursts of microsecond pulses have made it possible for the first time to detect overlap of hydroacoustic processes at the pulse spacing in bursts reduced to under 700 μs. In the case of overlap of hydroacoustic processes, despite the increase in average power and effective pulse repetition rate, acoustic wave generation is ineffective because pulses propagate through bubbles formed in the water. Laser cataract extraction is shown to be most effective at a lower average power, lower effective pulse repetition rate, and burst pulse spacing of 850 ± 10 μs.

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