Luminescent polymer optical fibers: gain spectroscopy and lasing
Luminescent polymer optical fibers: gain spectroscopy and lasing
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发光聚合物光纤：增益光谱和激光
DOI：
10.1117/12.475441
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
H. Hoerhold
中科院分区：
文献类型：
--
作者：
Takeyuki Kobayashi;W. Blau;H. Tillmann;H. Hoerhold
我们报告了我们的调查光放大和激光在玻璃包层阶跃折射率聚合物光纤，使用一种新型的蓝色发光芪类化合物。化合物1，4-双（4-二苯基氨基-苯乙烯基）-苯是专门针对光谱的蓝色区域设计和合成的，在聚苯乙烯中具有0.85的高量子产率和~50 nm的相对较大的斯托克斯位移。采用变条长法推导了掺0.2wt光纤的净增益系数。%的化合物。增益光谱已经揭示了一个广泛的光学增益超过25 cm-1和高达36 cm-1，在494 nm，覆盖了宽光谱范围约70 nm时，光纤横向光激发在12 mJ/cm 2。分析表明，均匀展宽增益的饱和效应是导致较长激发长度下放大自发辐射输出行为的主要原因。在494 nm处测得线性波导损耗为0.7 cm-1。大的增益和低的波导损耗允许在由光纤-空气界面处的菲涅耳反射限定的非常低精细度腔中从光纤（其长度仅为1.4cm）发射489 nm的蓝色激光的明确证明。激光阈值为1.7 mJ/cm ~ 2。本文的结果将为研究和开发非常紧凑的聚合物光纤激光器和放大器打开大门。
We report our investigation of light amplification and lasing in a glass-clad step-index polymer optical fiber that uses a novel blue-emitting stilbenoid compound. The compound, 1,4-bis(4-diphenylamino-styryl)-benzene, is designed and synthesized specifically for the blue region of the spectrum and has a high quantum yield of 0.85 in polystyrene and a relatively large Stokes shift of ~50 nm. The variable stripe length method is employed to deduce the net gain coefficient of a fiber doped with 0.2-wt. % of the compound. The gain spectroscopy has revealed a broad optical gain exceeding 25 cm-1 and up to 36 cm-1 at 494 nm that covers a wide spectral range of about 70 nm when the fiber is transversely photoexcited at 12 mJ/cm2. An analysis shows that the saturation effect expected for homogeneously broadened gain accounts for the amplified spontaneous emission output behavior at longer excitation lengths. The linear waveguide loss is measured to be 0.7 cm-1 at 494 nm. The large gain and the low waveguide loss have allowed the unequivocal demonstration of blue laser emission at 489 nm from the fiber (which is only 1.4 cm in length) in a very low finesse cavity defined by the Fresnel reflections at the fiber-air interfaces. The threshold for lasing is found to be 1.7 mJ/cm2. The results presented here will open the door to the study and development of very compact polymer fiber lasers and amplifiers.