激发态分子内质子转移分子2－（2′－羟基苯基）间氮杂氧茚“染料”激光特性的实验和理论研究

Experimental and Theoretic Research on Lasing Properties from 2 (2′ Hydroxyphenyl) Benzoxazole Based on Excited State Intramolecular Proton Transfer

报道了以Ｎ２激光为泵浦光源，获得激发态分子内质子转移（ＥＳＩＰＴ）分子ＨＢＯ的激光输出现象。其激光转换效率约为１７％，调谐范围为４９５～５４０ｎｍ，最强的输出波长在５１０ｎｍ。以ＨＢＯ的激发态分子内质子转移的光物理和光化学过程为基础，建立了ＨＢＯ产生激光的动态模型，数值模拟了在宽带和窄带情况下激光输出的光谱特性和时间特性，理论计算值与实验观测值很好相符。

The efficient lasing output from 2 (2′ hydroxyphenyl)benzoxazole(HBO) in cyclohaxane, based on excited state intramolecular proton transfer (ESIPT), is reported. The laser energy conversion efficiency is measured to be about 17%. And the tuning range is 495 nm￣540 nm. By considering the mechanism of ESIPT, we develop a kinetic model of proton transfer laser for HBO to calculate numerically the spectra and instantaneous features of the broad band and narrow band emissions. The calculated results are in agreement with the experiment very well. In addition, the calculated results show that the pulse duration of proton transfer laser dependents on the ground state lifetime of keto tautomer of ESIPT molecule.