通过对RhB/PMMA和Rh6G/PMMA染料薄膜的荧光光谱和放大自发辐射(ASE)光谱的实验测量和理论分析,研究了准波导结构染料薄膜的荧光光谱和ASE光谱特性。实验上采用连续激光和脉冲激光照射,分别测量准波导结构RhB/PMMA和Rh6G/PMMA染料薄膜的荧光光谱和ASE光谱,发现荧光峰和ASE峰随着染料掺杂浓度和薄膜厚度的增加产生红移;理论上考虑准波导结构下薄膜中染料的自吸收效应,类比激光器谐振腔模型,分析低阶导模传输的增益特性,获得了荧光光谱与ASE光谱中荧光峰和ASE峰对应波长与染料掺杂浓度的关系,数值计算与实验测量相吻合。结果表明,准波导结构下薄膜中染料自吸收效应导致荧光峰及ASE峰发生红移,改变染料掺杂浓度,可以在较大调谐范围实现ASE。 Fluorescence spectrum and ASE spectral characteristics of dye films of quasi-waveguide structures were studied by means of experimental measurement and theoretical analysis of fluorescence spectra and amplified spontaneous emission (ASE) spectra of RhB / PMMA and Rh6G / PMMA dye films. The fluorescence spectra and ASE spectra of RhB / PMMA and Rh6G / PMMA dye films were measured by continuous laser and pulsed laser irradiation respectively. It was found that the fluorescence peak and ASE peak increased with the increase of doping concentration and film thickness In theory, considering the self-absorption effect of dye in the quasi-waveguide structure and the analog laser resonator model, the gain characteristics of the low-order guided mode transmission are analyzed. The relationship between the fluorescence peak and the ASE peak corresponding wavelength and the dye Doping concentration, the numerical calculation and experimental measurements are consistent. The results show that the dye self-absorption effect in the quasi-waveguide structure leads to the red shift of fluorescence peak and ASE peak. Changing the dye doping concentration can realize ASE in a larger tuning range.