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Proceedings Paper

Er:YAG laser radiation applications in different medical branches
Author(s): Helena Jelínkova; Michal Němec; Petr Koranda; Jan Šulc; Miroslav Čech; Mitsunobu Miyagi; Yi-Wei Shi; Yuji Matsuura
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Paper Abstract

For the purpose of biophotonics, free running and Q-switched Er:YAG lasers were constructed. As Q-switches the rotating mirror and Pockels cell were used. In the case of rotating mirror placed inside the resonator the maximum of generated laser energy was 210 mJ in a free-running mode regime when pulses up to 110 μs long (FWHM) were generated. The resulted parameters of the giant pulses were 30 mJ energy, and 250 ns pulse length. For the Pockels cell Q-switching, the laser was generating 325 mJ of energy in a 250 μs pulse, and 60 mJ of energy in a 60 ns pulse in the case of free running and Q-switched regime, respectively. This output properties together with the generating wavelength (2.94 μm), coinciding exactly with the absorption peak of water, giving us the possibility of using this radiation to the efficient interaction with biological tissue. The transport of the radiation to the interaction place was solved by the special cyclic olefin polymer coated silver hollow glass waveguides with the inner diameter of 700 μm and the length of 10 - 50 cm. For the contact treatment the sealed caps were used for preventing delivery system damage. The aim of this work was except of special laser systems development, the investigation ofthe effect differences between long (free running) and short (nanosecond) laser pulses on ophthalmic (cornea, sclera), urologic (ureter wall), or dental (enamel, dentine) tissue.

Paper Details

Date Published: 18 April 2006
PDF: 9 pages
Proc. SPIE 6180, Photonics, Devices, and Systems III, 618023 (18 April 2006); doi: 10.1117/12.675852
Show Author Affiliations
Helena Jelínkova, Czech Technical Univ. (Czech Republic)
Michal Němec, Czech Technical Univ. (Czech Republic)
Petr Koranda, Czech Technical Univ. (Czech Republic)
Jan Šulc, Czech Technical Univ. (Czech Republic)
Miroslav Čech, Czech Technical Univ. (Czech Republic)
Mitsunobu Miyagi, Sendai National College of Technology (Japan)
Yi-Wei Shi, Tohoku Univ. (Japan)
Yuji Matsuura, Tohoku Univ. (Japan)

Published in SPIE Proceedings Vol. 6180:
Photonics, Devices, and Systems III
Pavel Tománek; Miroslav Hrabovský; Miroslav Miler; Dagmar Senderákova, Editor(s)

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