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Proceedings Paper

Electro-optically Q-switched Er:YAG laser and its application
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Paper Abstract

For many applications (in medicine and industry) powerful mid-infrared radiation can be useful. For this reason, Q-switch operated Er:YAG laser and corresponding delivery systems are necessary. We report about specially designed LiNbO3 Pockels cell by help of which the short 60 ns mid-infrared pulses were generated. For giant pulse generation two Brewster angle cut LiNbO3 crystal was inserted inside the oscillator and a specially designed driver ensured the precise time of Pockels cell switching. The optimization of the input parameters (high voltage value and Pockels cell switching time), which can have an impact on the output pulse characteristics, was performed. For the optimal found delay value 450 μs and the applied high voltage 1.4kV on the Pockels cell, giant pulses with length of 60 ns and energy of 60mJ were generated. It gave 1 MW of the output peak power. These powerful infrared pulses (λ= 2.94 μm) were delivered by the help of specially designed cyclic olefin polymer-coated silver hollow glass waveguide with the inner diameter 700 μm and length of 1 m. For the contact treatment sealed cap was used. The measured transmission of the whole delivery system was 76.5% which gave the output interaction intensity 79 MW/cm2.

Paper Details

Date Published: 23 March 2005
PDF: 6 pages
Proc. SPIE 5777, XV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, (23 March 2005); doi: 10.1117/12.611042
Show Author Affiliations
Petr Koranda, Czech Technical Univ. (Czech Republic)
Michal Nemec, Czech Technical Univ. (Czech Republic)
Helena Jelinkova, Czech Technical Univ. (Czech Republic)
Jan Sulc, Czech Technical Univ. (Czech Republic)
Miroslav Cech, Czech Technical Univ. (Czech Republic)
Yi-Wei Shi, Tohoku Univ. (Japan)
Yuji Matsuura, Tohoku Univ. (Japan)
Mitsunobu Miyagi, Tohoku Univ. (Japan)


Published in SPIE Proceedings Vol. 5777:
XV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers
Jarmila Kodymova, Editor(s)

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