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For longer laser pulses, the nonlinear equation does not work any more.
而当激光脉冲宽度大于该数值时, 该方程不再适用.
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The measurements of third - order hyperpolarizabilities were performed using Z - scan technique picosecond laser pulses at 1064 nm.
用Z - 扫描方法研究它们的三阶非线性光学性质.
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