Abstract
The damage threshold of lithium niobate crystal under single and multiple femtosecond laser pulses has been studied theoretically and experimentally. Firstly, the model for the damage threshold prediction of crystal materials based on the improved rate equation has been proposed. Then, the experimental measure method of the damage threshold of crystal materials has been given in detail. On the basis, the variation of the damage threshold of lithium niobate crystal with the pulse duration has also been analyzed quantitatively. Finally, the damage threshold of lithium niobate crystal under multiple laser pulses has been measured and compared to the theoretical results. The results show that the transmittance of lithium niobate crystal is almost a constant when the laser pulse fluence is relative low, whereas it decreases linearly with the increase in the laser pulse fluence below the damage threshold. The damage threshold of lithium niobate crystal increases with the increase in the duration of the femtosecond laser pulse. And the damage threshold of lithium niobate crystal under multiple laser pulses is obviously lower than that irradiated by a single laser pulse. The theoretical data fall in good agreement with the experimental results.
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This work was supported by China Academy of Engineering Physics Terahertz Science and Technology Fund Program (Grant No. CAEPTHZ201305) and China Innovative Talent Promotion Plans for Innovation Team in Priority Fields (Grant No. 2014RA4051).
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Meng, Q., Zhang, B., Zhong, S. et al. Damage threshold of lithium niobate crystal under single and multiple femtosecond laser pulses: theoretical and experimental study. Appl. Phys. A 122, 582 (2016). https://doi.org/10.1007/s00339-016-0120-x
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DOI: https://doi.org/10.1007/s00339-016-0120-x