一种新型有机染料的宽带双光子吸收和光限幅特性的研究

研究了一种新型双共轭链有机染料分子的双光子吸收（TPA）及其光功率限幅特性，实验研究了该有机染料的双光子吸收谱和光功率限幅曲线. 结果证实在浓度为1×10^-2 mol/L的四氢呋喃（THF）溶液中，该有机染料在近红外区有宽达400nm的宽带非线性双光子吸收及光功率限幅特性. 它的双光子吸收谱存在三个峰，分别位于730，850和980nm，并且在850nm处有最大的TPA截面，为σ′₂＝25.9×10^-47　cm^{4·s 关键词： 宽带 双光子吸收 光限幅 双共轭链有机分子}

Broadband two-photon absorption and optical power limiting properties of a novel organic compound

The two-photon absorption (TPA) property and optical power limiting behaviour of a novel double-conjugated segment organic molecule have been investigated, and its TPA spectrum and optical power limiting curve have been experimentally obtai ned. Strong TPA and broadband optical power limiting properties from 700 nm to 1 100 nm in the near infrared region have been demonstrated in the tetrahydrofuran (THF) solution with 1×10^-2mol/L concentration. It has three peaks o f TPA cross section at 730,850 and 980 nm. The maximum TPA cross section is σ′ ₂＝25.9×10^-47cm⁴·s·photon^-1 at 850nm, which is about 1-2 orders of magnitude larger than usual organic molecules.