A Ti₃AlC₂ MAX phase-based saturable absorber (SA) is successfully demonstrated to induce passive Q-switching in an erbium-doped fiber laser (EDFL) at the $1.5~\mu \text{m}$ region. The Ti₃AlC₂-PVA film is fabricated using the solution casting method and incorporated into the laser cavity which uses a 0.89 m long erbium doped fiber as the gain medium. Stable and self-starting Q-switched laser pulses are observed above a threshold pump power of 87.81 mW at a central wavelength of 1567.4 nm. The repetition rate is observed to increase from 24.07 kHz to 46.3 kHz, while the corresponding pulse width decreases from $5.0~\mu \text{s}$ to $0.99~\mu \text{s}$ over a pump power range of 108.9 mW to 244.5 mW. At the maximum pump power of 244.5 mW, the highest pulse energy of 102.7 nJ and the maximum output power of 4.75 mW are obtained. These findings demonstrated the feasibility of the Ti₃AlC₂ MAX phase as an SA material with significant promise for photonic applications. This is also, to the best knowledge of the authors, the first report of a Ti₃AlC₂ MAX phase-based SA for inducing passive Q-switching in an EDFL.

中文翻译：

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使用 Ti3AlC2 MAX 基于相位的可饱和吸收器在 1.5 µm 区域的 Q 开关光纤激光器

基于Ti ₃ AlC ₂ MAX 相的可饱和吸收体 (SA) 被成功证明可在掺铒光纤激光器 (EDFL) 中诱导被动调Q $1.5~\mu \text{m}$ 地区。Ti ₃ AlC ₂ -PVA 薄膜采用溶液浇铸法制成，并装入使用 0.89 m 长掺铒光纤作为增益介质的激光腔中。在 1567.4 nm 的中心波长处，在 87.81 mW 的阈值泵浦功率以上观察到稳定且自启动的 Q 开关激光脉冲。观察到重复率从 24.07 kHz 增加到 46.3 kHz，而相应的脉冲宽度从 $5.0~\mu \text{s}$ 至 $0.99~\mu \text{s}$ 在 108.9 mW 至 244.5 mW 的泵功率范围内。在244.5 mW的最大泵浦功率下，获得了102.7 nJ的最高脉冲能量和4.75 mW的最大输出功率。这些发现证明了 Ti ₃ AlC ₂ MAX 相作为 SA 材料的可行性，对光子应用具有重要前景。据作者所知，这也是第一份基于 Ti ₃ AlC ₂ MAX 相位的 SA 用于在 EDFL 中诱导无源 Q 开关的报告。