28 May 1993 In-vitro lithotripsy with Er:Cr:YSGG lasers through fiber
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Proceedings Volume 1879, Lasers in Urology, Gynecology, and General Surgery; (1993) https://doi.org/10.1117/12.146230
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States
Abstract
In this paper we report the results on the destruction of several types of stones in aqueous media by radiation of Er:YSGG laser transported through fibers, i.e., under the conditions simulating those of the human body. The lasers operated in both Q-switched mode and in free lasing. For experiments, we used fluoride and quartz fibers with core diameters of 0.2 and 0.4 mm respectively. A fluoride fiber approximately as long as one meter transmits not less than 80% of the incident radiation and exhibits good strength (it survives bending with a curvature radius of about 2 cm). Quartz-quartz fiber with polymer cladding was made of dried quartz in the Institute of General Physics. Transmission of a 0.5-m piece was up to 50%. The laser used Cr:Er:YSGG rod (diameter 4 mm, length 75 mm), concentrations of Cr and Er ions were 2.1020 and 4.7.1021 cm-3 respectively. Both free lasing and Q- switched modes were tried, pulse durations being about 100 microsecond and 100 nanosecond respectively. Repetition rates were from 1 to 5 Hz. Radiation was put into fibers with the use of a fluoride lens with focal length 20 mm. The mass of material (Delta) m removed by ablation was determined from the volume of cavities produced by laser radiation and the stone's density, the volumes having been measured using a microscope.
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M. A. Bloch, S. L. Fedorovskii, A. M. Suslov, B. A. Mikhailov, S. K. Pak, Ivan Alexandrov Shcherbakov, "In-vitro lithotripsy with Er:Cr:YSGG lasers through fiber", Proc. SPIE 1879, Lasers in Urology, Gynecology, and General Surgery, (28 May 1993); doi: 10.1117/12.146230; https://doi.org/10.1117/12.146230
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