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Proceedings Paper

Generation of powerful 3 microns radiation and its delivery
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Paper Abstract

In some last years mid-infrared Er:YAG laser radiation (2940 nm) found the exploitation in many applications in technology and especially in various medical branches (dentistry, dermatology, cardiology, ophthalmology). Most of them use the Er:YAG laser system working in free-running regime generating the pulses with the length of some hundreds of microseconds. In the presented work we concentrated on the development and optimization of electro-optically Q-switched Er:YAG laser and suitable delivery system. Er:YAG laser operated both in free-running or Q-switched regime was developed and optimized. LiNbO3 Pockels cell was utilized for Q-switching the Er:YAG laser. Single giant pulses with maximal energy 67 mJ and minimal duration 53 ns FWHM were generated for maximal pump energy 131 J and for the optimal Pockels cell parameters (high voltage value 1.4 kV, delay of Pockels cell switching after the flashlamp trigger 450 μs). The Er:YAG laser radiation was effectively delivered by the special COP/Ag hollow glass waveguides with inner/outer diameters 700/850 μm or 320/450 μm, and length from 10 cm up to 1 m. The transmission of the used waveguides was measured to be from 73% to 84% according to waveguide type. With the help of delivery systems, the Er:YAG laser radiation (in the form of long pulses for free-running regime or short pulses for Q-switched regime) was applied to various biological tissue samples to study the basic laser radiation-tissue interactions and treatment possibilities.

Paper Details

Date Published: 17 April 2006
PDF: 9 pages
Proc. SPIE 6190, Solid State Lasers and Amplifiers II, 619016 (17 April 2006); doi: 10.1117/12.663624
Show Author Affiliations
Miroslav Čech, Czech Technical Univ. Prague (Czech Republic)
Michal Němec, Czech Technical Univ. Prague (Czech Republic)
Petr Koranda, Czech Technical Univ. Prague (Czech Republic)
Helena Jelínkova, Czech Technical Univ. Prague (Czech Republic)
Mitsunobu Miyagi, Sendai National College of Technology (Japan)
Katsumasa Iwai, Sendai National College of Technology (Japan)
Yi-Wei Shi, Fudan Univ. (Japan)
Yuji Matsuura, Tohoku Univ. (Japan)

Published in SPIE Proceedings Vol. 6190:
Solid State Lasers and Amplifiers II
Alphan Sennaroglu, Editor(s)

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