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首页> 外文期刊>Applied optics >Resonant effects in nonlinear photon absorption during femtosecond laser ablation of Nd-doped silicate glass
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Resonant effects in nonlinear photon absorption during femtosecond laser ablation of Nd-doped silicate glass

机译：飞秒激光烧蚀掺钕硅酸盐玻璃中非线性光子吸收的共振效应

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摘要

This study investigates the resonant effects in nonlinear photon absorption in femtosecond laser ablation of Nd-doped silicate glass (Nd:glass). During the femtosecond laser ablation process, the resonant ablation threshold fluence is decreased by up to 40% compared with that of ordinary ablation. However, it is found that the resonant effect is closely related with laser intensity, and lower laser intensities are required to achieve a significant enhancement. When the intensity is lower than 2.28 × 10~(14) W/cm~2 at which multiphoton ionization dominates, resonant effect is enhanced by a factor of 1.4 to 4.4. When the intensity is higher than 2.28 × 10~(14) W/cm~2, at which intensity tunnel ionization dominates, the resonant effect becomes weak and gradually fades away. It is shown that the resonant effect is still important for multiphoton ionization yet insignificant for tunnel ionization.
机译：本研究研究了掺钕硅酸盐玻璃（Nd：glass）飞秒激光烧蚀中非线性光子吸收的共振效应。在飞秒激光烧蚀过程中，共振烧蚀阈值通量与普通烧蚀相比降低了40％。然而，发现共振效应与激光强度密切相关，并且需要较低的激光强度来实现显着的增强。当强度低于多光子电离作用占主导地位的2.28×10〜（14）W / cm〜2时，共振效应提高了1.4到4.4。当强度高于2.28×10〜（14）W / cm〜2时，在该强度下隧道隧穿电离作用占主导，谐振效应变弱并逐渐消失。结果表明，共振效应对于多光子电离仍然很重要，但对于隧道电离却不重要。

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