<title>In-vitro lithotripsy with Er:Cr:YSGG lasers through fiber</title>

1993; SPIE; Volume: 1879; Linguagem: Inglês

10.1117/12.146230

ISSN

1996-756X

Autores

M. A. Bloch, S. L. Fedorovskii, A M Suslov, B. A. Mikhailov, S. K. Pak, И. А. Щербаков,

Tópico(s)

Laser Design and Applications

Resumo

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 2.10 20 and 4.7.10 21 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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