五氮齿金属配合物溶液对皮秒激光的光限幅

Optical Limiting of Pentaazadentate Metal Complexes for ps Pulses in Solution

报导了五种五氮齿金属配合物对 3 5 ps激光光限幅的实验结果 ,限幅机制属于激发态的反饱和吸收。在实验所用较高激光能量时 ( 2 .6J/cm2 ) ,没有观察到样品被损坏的现象。配合物 [(APPC -COOH)Cd]Cl(Ⅰ )和 [(APPC -Np)Cd]Cl(Ⅱ )的光限幅阈值 (T/T0 =0 .5时 )分别为 44 .1mJ/cm2 和 146mJ/cm2 ,配合物Ⅰ最低非线性透过率达 9%。吸电子基团能增强该类配合物对皮秒激光的限幅效果 ,而重原子效应则起相反的作用。

The experimental results of optical limiting for five pentaazadentate metal complexes for ps pulses are reported,the mechanism is reverse saturable absorption.The samples don't be damaged when high energy laser (2.6J/cm 2) is used in our experiments.The limiting thresholds of complexes [(APPC-COOH)Cd]Cl(Ⅰ) and [APPC-Np)Cd]Cl (Ⅱ) at T/T 0 =0.5 are 44.1mJ/cm 2 and 146 mJ/cm 2 respectively.The lowest nonlinear transmittance of complex Ⅰ is 9%.Electron withdrawing groups can enhance the limiting effect for this kind of complexes,but the effect of heavy atom acts opposite role.