Inserting a crystalline P(VDF-TrFE) intermediate layer under rhodamine 6G (R6G) laser active waveguide layer preserved the emissive R6G molecules in the matrix, which increases the intensity of fluorescence of R6G dye in the matrix and thus enhances the laser performance, including the optical gain of amplified spontaneous emission (ASE). The thermal annealing of the intermediate layer of P(VDF-TrFE) affects the optical gain of ASE and the laser performance in terms of slope efficiency and the threshold for the R6G/CA waveguide laser devices with DFB and DBR structures. With a higher annealing temperature, the crystallinity, crystallite size, and thus surface roughness of the P(VDF-TrFE) layer were increased; simultaneously, the fluorescence intensity, the optical gain of ASE, and the slope efficiency were increased, and the threshold for lasing was reduced. Thermal annealing of P(VDF-TrFE) at 120 °C gave a higher crystallinity, larger crystallite size, and thus deeper surface roughness. A DBR laser device with m = 2 mode number gave a slope efficiency of 4.6% and the optical gain of ASE of 13.0 cm^–1. The deeper roughness of the surface due to the larger polar β-crystallites of P(VDF-TrFE) was significantly related to the increased intensity of fluorescence, optical gain of ASE, and slope efficiency for laser emission and the reduced threshold for lasing. The present approach is the easier way to enhance the lasing performances for ionic laser dyes in industrial applications.

中文翻译：

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罗丹明6G /醋酸纤维素DFB和DBR波导器件的自发发射和激光性能的增强：热退火P（VDF-TrFE）中间层的作用

在若丹明6G（R6G）激光有源波导层下面插入晶体P（VDF-TrFE）中间层可将发光的R6G分子保留在基质中，从而增加了基质中R6G染料的荧光强度，从而增强了激光性能，包括放大的自发发射（ASE）的光学增益。P（VDF-TrFE）中间层的热退火会影响ASE的光学增益和激光器的性能，如斜率效率以及具有DFB和DBR结构的R6G / CA波导激光器的阈值。在较高的退火温度下，P（VDF-TrFE）层的结晶度，微晶尺寸和表面粗糙度增加；同时，荧光强度，ASE的光学增益和斜率效率增加，并且降低了发射的阈值。P（VDF-TrFE）在120°C的温度下进行热退火可得到更高的结晶度，更大的晶粒尺寸，并因此获得更深的表面粗糙度。具有以下功能的DBR激光设备m = 2模数给出的斜率效率为4.6％，ASE的光学增益为13.0 cm ^–1。P（VDF-TrFE）的极性β-微晶较大导致表面更深的粗糙度与荧光强度的增加，ASE的光学增益以及激光发射的斜率效率和降低的激光阈值显着相关。本方法是在工业应用中增强离子激光染料的激光性能的更简便方法。