Generation of powerful 3 microns radiation and its delivery

Miroslav Čech; Michal Němec; Petr Koranda; Helena Jelínkova; Mitsunobu Miyagi; Katsumasa Iwai; Yi-Wei Shi; Yuji Matsuura

doi:10.1117/12.663624

17 April 2006 Generation of powerful 3 microns radiation and its delivery

Miroslav Čech, Michal Němec, Petr Koranda, Helena Jelínkova, Mitsunobu Miyagi, Katsumasa Iwai, Yi-Wei Shi, Yuji Matsuura

Author Affiliations +

Proceedings Volume 6190, Solid State Lasers and Amplifiers II; 619016 (2006) https://doi.org/10.1117/12.663624
Event: SPIE Photonics Europe, 2006, Strasbourg, France

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.

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Miroslav Čech, Michal Němec, Petr Koranda, Helena Jelínkova, Mitsunobu Miyagi, Katsumasa Iwai, Yi-Wei Shi, and Yuji Matsuura "Generation of powerful 3 microns radiation and its delivery", Proc. SPIE 6190, Solid State Lasers and Amplifiers II, 619016 (17 April 2006); https://doi.org/10.1117/12.663624

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