有机高聚物PPQ薄膜的反常群速色散

通过对ＰＰＱ薄膜的吸收光学谱的计算分析，由Ｋｒａｍｅｒｓ－Ｋｒｏｎｉｇ关系得到ＰＰＱ膜在５５０ｎｍ～７００ｎｍ左右波段存在负群速色散区，并且色散量对相对较小，│β２│〉１．２ｐｓ＾２／ｍ，这使得对飞秒激光脉冲在ＰＰＱ平面光波导中的传输的传输的描述可以忽略色散顶，根据这一间化，仅考虑自相位调制（ＳＰＭ）效应，由于飞秒对撞锁激光脉冲的光谱展宽民计算的ＰＰＱ的非线性折射率系数ｎ２，与报道的结果吻合很好。

Anomalous Group Velocity Dispersion of PPQ Organic Conjugated Polymeric Cast Film

Integration calculations for the absorption spectrum of PPQ polymeric cast film, by means of the Kramers Kronig relation, were performed for a serial number of wavelengths. An existence of an region of anomalous group velocity dispersion (GVD) span near (550￣700) nm band was evidently indicated. The dispersion parameter β 2 is relatively small, |β 2|<1.2 ps 2/m, so that a dispersion neglected nonlinear Schordinger equation was used to described the propagating behavior of femtosecond colliding pulse mode locking (CPM) laser pulses in planar optical waveguide of PPQ film, and consequently, the obtained nonlinear refractive index coefficient n 2 was in a good agreement with the reported value.