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采用准分子激光器成功地在低掺杂普通铒纤上制作出5 cm的光纤光栅分布反馈布拉格(DFB)激光器,铒纤的峰值吸收率为5 dB/m,在100 mW,980 nm抽运光条件下,光纤激光器的输出功率为50μW,边模抑制比为50 dB。使用耦合模理论分析了一段5 cm带相移的分布反馈布拉格光纤激光器输出光强同腔内损耗及相移量的关系,计算结果表明,光纤腔内的损耗对激光器的输出具有非常重要的影响,大的损耗对应获得最大功率的光栅耦合强度相应减小,因此,在低掺杂铒纤上制作分布反馈布拉格激光器必须正确估计光纤激光器的腔内损耗,选择合适的光栅耦合强度,可以获得较大的输出功率。
A 5 cm Fiber Bragg Grating distributed feedback Bragg grating (DFB) laser was successfully fabricated on low-doped ordinary erbium fiber using an excimer laser. The peak absorption rate of erbium fiber was 5 dB / m. At 100 mW and 980 nm, Under the condition, the output power of the fiber laser is 50μW, the side mode suppression ratio is 50 dB. The coupling mode theory is used to analyze the relationship between the output light intensity and the amount of phase shift of a 5 cm distributed feedback Bragg fiber laser with phase shift. The calculated results show that the loss in the fiber cavity has a very important influence on the laser output , The large loss corresponds to the grating coupling strength corresponding to the maximum power. Therefore, to fabricate the distributed feedback Bragg lasers on the low-doped erbium fiber, the cavity loss in the fiber laser must be correctly estimated. The appropriate grating coupling strength can be obtained, Large output power.