Delay dependency of two-pulse femtosecond laser damage

M. Gyamfi, P. Jürgens, L. Jensen, D. Ristau
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引用次数: 2

Abstract

In the femtosecond regime laser damage thresholds are determined by the electric field distribution within the optical components. Especially, for radiation sources with integrated frequency conversion the simultaneous presence of photons with different frequencies introduces additional ionization channels in optical materials by cross excitation and other effects. In this work we report on the pulse delay dependency of the LIDT of HR390/780nm mirrors under simultaneous exposure to fundamental and second harmonic femtosecond radiation. We perform Son1-tests according to ISO 21254 with the addition of a second harmonic pulse at different fixed pulse energies. To determine the influence of the cross excitation between fundamental and second harmonic radiation, these tests are repeated for different time delays between the two pulses. For the 1on1, single wavelength femtosecond LIDT testing, the Keldysh theory in combination with the Drude Model has been proven to reasonably describe the time dependent electron density in the conduction band, and hence the LIDT. We extend these approaches to the determination of the LIDT for the case of simultaneous interactions of photons of two separate wavelengths.
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双脉冲飞秒激光损伤的延迟依赖性
飞秒激光损伤阈值由光学元件内部的电场分布决定。特别是对于集成频率转换的辐射源,不同频率光子的同时存在通过交叉激发和其他效应在光学材料中引入了额外的电离通道。本文报道了HR390/780nm反射镜同时暴露于基频和次谐波飞秒辐射下LIDT的脉冲延迟依赖性。我们根据ISO 21254进行son1测试,并在不同的固定脉冲能量下添加二次谐波脉冲。为了确定基频和二次谐波辐射之间交叉激励的影响,对两个脉冲之间不同的时间延迟重复了这些测试。对于1on1,单波长飞秒LIDT测试,Keldysh理论结合Drude模型已经被证明可以合理地描述导带中随时间变化的电子密度,从而描述LIDT。我们将这些方法扩展到确定两个不同波长的光子同时相互作用的LIDT。
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