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随机光纤激光器中光纤与随机介质匹配问题的研究
Discussion on the problem of random media matching with the PCF for RFL
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摘要: 降低阈值是随机激光实用化的前提，随机光纤激光器是将随机增益介质填充到空芯光子晶体光纤中利用其光子禁带来降低阈值的一种随机激光器。理论分析表明：在光子晶体光纤光子禁带的约束下，随机光纤激光器中的大部分能量被集中在芯区传播，这使局域在芯区的光与随机介质相互作用得到增强，激发效率得以提高。然而，光纤填充介质后，纤芯等效折射率发生了改变，光子带隙也会随之移动，因此当选用带隙光纤来降低阈值时，只考虑光纤本身的带隙是不够的，应考虑到介质的增益频率和填充后的光子带隙之间的匹配问题，合理选择光纤或介质的材料，如果匹配得当，光子禁带对激光的调控能力会更强，激光阈值有望得到更大程度的降低。Abstract: To reduce the threshold is an important requirement for utilizing the random laser. RFL (random fiber laser) is a new random laser which user the photonic bandgap of PCF to lower the threshold by filling the random medium into a hollow-core PCF. Theoretical analysis shows that most of the emitted light is concentrated in the core of the fiber because of the controlling of the bandgap, which should enhance the interaction between the random medium and the localized light for the light oscillating back and for the thin core region, therefore the excitation efficiency of the random laser could be improved. However, the band gap of PCF filled with the random medium should be changed, so when choosing fiber to reduce the threshold for RFL, we should consider the matching between the new bandgap of the padded fiber and the gain frequency of the medium, and arrange the fiber and medium in pairs reasonably. If the PCF matches with the medium, the lasing may be enhancedly regulated and controlled and the threshold can be reduced greatly.
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