2-(2'-羟基苯基)间氮杂氧茚放大的自发辐射效应的实验和理论研究

Experimental and Theoretical Study on Amplified Spontaneous Emission from 2-(2'-hydroxyphenyl) Benzoxazole Based on Excited State Intramolecular Proton Transfer

报道了在氮分子激光泵浦下，激发态分子内质子转移分子2－（2＇－羟基苯基）间氮杂氧茚（HBO）环乙烷溶液放大的自发辐射（ASE）实验和理论研究。在环己烷溶液中，HBO的增益系数α（510um）约为1．2cm-1。在建立了HBO激发态分子内质子转移（ESIPT）的放大的自发辐射动态模型基础上，通过数值模拟得到了HBO的增益光谱和放大的自发辐射光谱，计算结果与实验很好相符，证实了HBO的酮式异构体的基态寿命更接近于260ns而非亚纳秒级。

The efficient generation of amplified spontaneous emission (ASE) in 2- (2'- hydroxyphenyl) benzoxazole (HBO) in cyclohexane solution based on excited state intramolecular proton transfer (ESIPT) is reported. The gain coefficient (α) for ASE(510 nm) of HBO is measured as about 1. 2 cm-1, nearly equal to that of rhodamine-6G under similar conditions in our apparatus. Based on ESIPT processes of HBO, a kinetic model for ASE is developed to simulate numerically the gain spectra and ASE spectra. The agreement between the computed results and experiment is very satisfactory with a τs0s0' value of 260 ns. This fact sugguests that the lifetime of ground state keto tautomer (K) is more likely to be 260 ns rather than subnanosecond.