聚丁二炔晶体中的电场调制光吸收

Electroabsorption in Polydiacetylene Crystals

采用微扰理论，考虑外场引起激子态的混合和偶极算子的改变，推导出了电场调制光吸收（ＥＡ）谱△α（ω）的的普遍公式；对聚丁二炔（Ｐｏｌｙｄｉａｃｅｔｙｌｅｎｅｓ）（ＰＤＡ’ｓ）中△α（ω）谱在ω＞２．３５ｅＶ的高能区振荡信号的起源作了详细的讨论，这非常有助于理解这类材料的非线性光学特性的微观机理．

Using perturbation theory and considering the mixing of excition statesand the changing of polarizing operator caused by applied field E_m at the same time ,thegeneral formula for electroabsorption △α(ω) is derived. The origin of oscillating signalsin the region ω>2.35eV in △α(ω)for polydiacetylene crystals is discussed in detail. It isvery useful for understanding the mechanism of nonlinear optical characters in these materials.