8 July 2004 LiNbO3 Pockels cell for Q-switch of Er:YAG laser
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Proceedings Volume 5332, Solid State Lasers XIII: Technology and Devices; (2004) https://doi.org/10.1117/12.525990
Event: Lasers and Applications in Science and Engineering, 2004, San Jose, Ca, United States
Abstract
Generation of a giant pulse of Er:YAG laser is complicated mainly due to the properties of the Er:YAG active medium itself. It is caused by the short lifetime of the upper laser level of Er:YAG crystal and a small gain for one pass of the radiation through the active medium. In our case, a specially designed LiNbO3 electrooptic shutter was used for Q-switching of Er:YAG laser. Brewster angles were employed at the LiNbO3 crystal faces to avoid the inclusion of a polarizer into the resonator. Even if Er:YAG crystal emission is naturally unpolarized we have found that polarization sensitive reflections at two Brewster-cut ends of Pockels cell are sufficient to reach extinction ratio necessary for giant pulse generation. By help of theoretical analysis based on Jones calculus was found the dependency of Pockels cell radiation transmission on applied voltage. Calculated transmission of Brewster-Brewster LiNbO3 Pockels cell operating in quarter-wave regime was 30% in closed state. Theoretically and experimentally was found, that for 25 mm long LiNbO3 crystal voltage 1.5 kV is sufficient for Q-switching. With described Pockels cell was realized stable running Q-switched Er:YAG laser system. The generated giant pulse length and energy was 70 ns and 30 mJ, respectively.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jan Sulc, Jan Sulc, Helena Jelinkova, Helena Jelinkova, Petr Koranda, Petr Koranda, Michal Nemec, Michal Nemec, Miroslav Cech, Miroslav Cech, } "LiNbO3 Pockels cell for Q-switch of Er:YAG laser", Proc. SPIE 5332, Solid State Lasers XIII: Technology and Devices, (8 July 2004); doi: 10.1117/12.525990; https://doi.org/10.1117/12.525990
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