We study gain amplification processes in a single organic microfiber fabricated by melt electro-spinning method. Smooth, individual and cylindrical fiber is obtained. The gain-induced response of the microfiber is found to depend sensitively on the fiber structure. In the homogeneous single fiber where loop cavity forms, high net optical gain of up to 31.4 cm⁻¹ results in spectral narrowing at the material gain peaks. In the case of strong optical feedback, which occurs in such a long microfiber, amplified spontaneous emission with a low threshold of 0.08 mW is obtained. The low threshold and high gain attribute also to the cylindrical cavity which supplies positive feedback.

我们研究了通过熔融电纺丝法制造的单个有机超细纤维中的增益放大过程。获得了光滑的，单根的和圆柱形的纤维。发现微纤维的增益引起的响应敏感地取决于纤维结构。在形成环形腔的均匀单纤维中，高达31.4 cm ^-1的高净光学增益会导致材料增益峰值处的光谱变窄。在如此长的超细纤维中发生强烈的光反馈的情况下，可获得具有0.08 mW的低阈值的放大自发发射。低阈值和高增益也归因于提供正反馈的圆柱腔。