咔唑类化合物的光谱特性与三光子激射

Spectral Properties of Carbazole Molecules and Three-Photon Induced Lasing

测量了一系列新合成的咔唑类化合物的光谱特性。光谱研究结果发现端基团的选择引起双光子吸收截面的巨大变化。用1.3μm强fs激光激发其中一双光子吸收截面高达617.3 GM的分子溶液,其波长和时间分辨光谱特性表明此分子的高方向性光发射是三光子诱导激射。[1 GM(G ppert-Mayer)=10-50cm4.s.(photon)-1]。

Spectral properties of a series of new heterocyelic molecules were studied in the present work. The spectral experirnental results show that the two-photon absorption cross-sections of these new molecules are dependent on their charge transfer dipole moments, which relate to the donor aeeeptor end groups. At high density pumping, the spectral and temporal properties of the high directional emission of a new molecule with two-photon absorption cross-section of 617.3 GM demonstrate that three-photon induced lasing occurs.