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超短光脉冲的对称性可以用单延迟三次相关测试来测定,若再与二次相关测试所得的结果进行比较,可以得到更多的关于脉冲形伏的信息,经测定,Nd:YAG被动锁模激光器的脉冲形状可近似认为高斯-指数形,三次相关函数宽度为22.3ps+15.7ps,对应脉冲宽度为27ps,脉冲的前沿陡于后沿。The asymmetry of ultrashort light pulse may be detected by third order intensity correlation. As compared with the results of SHG method, more information may be obtained about the shape of the pulse. According to our measurement, the shape of the pulse of passively mode-locked Nd: YAG Laser can be considered approximately as Gaussian-exponential. The correlation width obtained by third order intensity correlation was 22.3 ps+15.7 ps, its corresponding pulse width was about 27ps. The leading edge of the pulse was steeper than the trailing edge.
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