消荧光现象与表面谐波产生

消荧光现象是激光与物质表面非线性相互作用的结果，这是一种普遍现象。在表面谐波产生的研究中，它常常被忽略。大量研究表明：表面谐波产生与消荧光现象，有着密切的内在联系。本文以消荧光观点详细讨论了表面谐波产生的机制，提出了表面谐波产生的消荧光模型。新机制可归纳为：（ａ）多光子受激吸收产生消荧光光斑，（ｂ）激光热效应等促进自发辐射转向准受激辐射，（ｃ）伴随荧光消失，部分产生荧光的激光能量转换为产生表面谐波

THE INTERIOR RELATION BETWEEN FDP AND SHG

The fluorescence disappearing phenomenon (FDP) was used due to the nonlinear interaction between the laser and the matter,a universal phenomenon.It was often neglected during the research of surface harmonic generation (SHG).Many experiments showed that there was a interior relation between FDP and SHG.In this paper,the mechanism of surfaceharmonic generation has been discussed in detail,according to the fluorescence disappear viewpoint and the fluorescence disappear model (FDM)proposed also.The new mechanism was summarized by following three points:(a) The multiphoton absorption generated visible fluorescence spot,(b) Laser heating effect and other effects promoted the conversion from spontaneous emission into quasi stimulated emission,(c)Being accompanied by the fluorescence disappear,the part of laser energy which was initially used to cause fluorescence was now converted into developing the harmonic signal.