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由于忽略激光能量分布的不均匀性,当前常用的非线性透过率方法得到的三光子吸收系数的拟合误差比较大.现有材料的三光子吸收截面还比较小,阻碍了人们对三光子吸收特性的应用.本文提出了一种精确的三光子吸收拟合方法,适合于各种能量分布不均匀的激光脉冲.合成了一种具有三光子吸收特性的对称型芴类衍生物2,7-二(4-甲氧基苯乙炔)-9-硫酮芴,三光子吸收截面较大,具有很好的激光脉冲光稳幅特性.
Due to the inhomogeneity of the laser energy distribution being ignored, the fitting error of the three-photon absorption coefficient obtained by the commonly used nonlinear transmittance method is comparatively large, and the three-photon absorption cross-section of the existing materials is relatively small, Absorption characteristics.This paper presents an accurate three-photon absorption fitting method, which is suitable for a variety of laser pulses with uneven energy distribution.The synthesis of a symmetrical fluorene derivative with three-photon absorption 2,7 - bis (4-methoxyphenylacetylene) -9-thione fluorene has a large three-photon absorption cross-section and good laser pulse light stability.