For the first time, this research proposed a copper telluride (Cu₂Te)-polyvinyl alcohol thin film as a saturable absorber (SA) in an erbium-doped fiber laser (EDFL) operating in the long-wavelength band (L-band). The nonlinear optical absorption measurement of Cu₂Te thin film revealed a saturation intensity of 3.26 kW cm⁻² and a modulation depth of 2.7%. Furthermore, the mode-locked pulse was successfully generated by integrating a Cu₂Te thin film into the L-band cavity at a threshold pump power of 135.61 mW with a center wavelength and pulse duration of 1565.48 nm and 770 fs, respectively. When observing the output mode-locked pulse, the pump power for the EDFL ranged from 135.61 mW to 201.28 mW, with the fundamental mode having a repetition rate 10.28 MHz. Furthermore, the magnitude of the signal-to-noise ratio was approximately 61.3 dB, indicating that the laser was stable with no significant fluctuations during the stability test. Overall, the findings showed that Cu₂Te thin film has an excellent output and a promising candidate for an SA, implying that it could have a lot of potentials in pulsed laser application.

本研究首次提出在长波长波段（L波段）工作的掺铒光纤激光器（EDFL）中使用碲化铜（Cu ₂ Te）-聚乙烯醇薄膜作为可饱和吸收体（SA） . Cu ₂ Te 薄膜的非线性光学吸收测量揭示了3.26 kW cm ^-2的饱和强度和2.7%的调制深度。此外，通过将 Cu ₂薄膜以 135.61 mW 的阈值泵浦功率进入 L 波段腔，中心波长和脉冲持续时间分别为 1565.48 nm 和 770 fs。在观察输出锁模脉冲时，EDFL 的泵浦功率范围为 135.61 mW 至 201.28 mW，基模重复率为 10.28 MHz。此外，信噪比的大小约为 61.3 dB，表明激光器在稳定性测试过程中是稳定的，没有明显的波动。总体而言，研究结果表明，Cu ₂ Te 薄膜具有出色的输出和有希望的 SA 候选者，这意味着它在脉冲激光应用中具有很大的潜力。