Abstract Generally, broadband absorbers has much non-saturable loss and low laser damage threshold, which limits the average output power of the fiber lasers mode locked by broadband absorbers. Exceptions are the absorbers in evanescent wave mode locking, in which way only weak laser passes through the absorber section. However, evanescent wave mode locking method needs to change the original structure of the fiber. Most of the commercial fiber-lasers adopt face-to-face passive mode-locking. Therefore, it is important to increase the damage threshold of the broadband absorbers. In this study, for the first time, a single-walled carbon nanotube (SWNT)-doped sol-gel glass composite absorber is fabricated using a low-temperature sol-gel method. The main component of the sol-gel glass is compact amorphous inorganic silicon-dioxide, which has high laser-damage threshold. The SWNT-doped sol-gel glass is integrated into the erbium-doped fiber (EDF) laser and mode-locking occurs at 1559 nm. The shortest pulse duration is 456 fs, and the maximum average output power is 110.65 mW. Compared to most EDF lasers based on broadband absorbers, the average output power is one of the highest values. The results indicate that encapsulating absorber in the inorganic sol-gel matrix is a promising method for fabricating high power ultrafast fiber laser type absorbers.

中文翻译：

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具有碳纳米管掺杂溶胶-凝胶玻璃锁模器的高功率掺铒光纤激光器

摘要 一般而言，宽带吸收体具有较大的非饱和损耗和较低的激光损伤阈值，限制了宽带吸收体锁模光纤激光器的平均输出功率。消逝波锁模中的吸收器是个例外，在这种情况下，只有微弱的激光才能通过吸收器部分。然而，倏逝波锁模方法需要改变光纤的原始结构。大多数商用光纤激光器采用面对面的被动锁模。因此，提高宽带吸收体的损伤阈值很重要。本研究首次采用低温溶胶-凝胶法制备了单壁碳纳米管（SWNT）掺杂的溶胶-凝胶玻璃复合吸收体。溶胶-凝胶玻璃的主要成分是致密的无定形无机二氧化硅，具有较高的激光损伤阈值。SWNT 掺杂的溶胶-凝胶玻璃被集成到掺铒光纤 (EDF) 激光器中，锁模发生在 1559 nm。最短脉冲持续时间为456 fs，最大平均输出功率为110.65 mW。与大多数基于宽带吸收体的 EDF 激光器相比，平均输出功率是最高值之一。结果表明，将吸收剂封装在无机溶胶-凝胶基质中是一种很有前途的制造高功率超快光纤激光型吸收剂的方法。平均输出功率是最高值之一。结果表明，将吸收剂封装在无机溶胶-凝胶基质中是一种很有前景的制造高功率超快光纤激光型吸收剂的方法。平均输出功率是最高值之一。结果表明，将吸收剂封装在无机溶胶-凝胶基质中是一种很有前景的制造高功率超快光纤激光型吸收剂的方法。