Rutile-phase titanium dioxide for a stable picosecond erbium-doped fiber soliton laser

IF 1.9 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

The European Physical Journal B Pub Date : 2026-10-16 DOI:10.1140/epjb/s10051-026-01289-x

Xian Li, Zairong Zhang, Hanling Li, Zhongliang Zeng

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Abstract

Semiconductor oxide materials have demonstrated significant potential in ultrafast laser device owing to their broadband spectral response, high damage resistance, and excellent physicochemical stability. In this work, we prepared a rutile-phase titanium dioxide (TiO₂) nanofilm, experimental results show that by integrating the saturable absorber (SA) into a ring fiber cavity, stable conventional soliton mode-locking operation was achieved, with a center wavelength of 1559.49 nm, a 3 dB spectral bandwidth of 16.60 nm, a pulse duration of 1.01 ps, a fundamental repetition rate of 22.1 MHz, and a signal-to-noise ratio (SNR) of 68.61 dB in the radio frequency (RF) spectrum. The prepared TiO₂ exhibits a modulation depth of 5.96% and a saturation intensity of 0.7149 MW/cm². This study verifies the feasibility of rutile-phase TiO₂ as an efficient and stable SA for 1.5 μm band ultrafast fiber laser.

Graphical abstract

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用于稳定皮秒掺铒光纤孤子激光器的金红石相二氧化钛

半导体氧化物材料具有宽带光谱响应、高抗损伤性和优异的物理化学稳定性，在超快激光器件中具有重要的应用潜力。本文制备了金红石相二氧化钛（TiO2）纳米膜，实验结果表明，通过将可饱和吸收剂（SA）集成到环形光纤腔中，实现了稳定的常规孤子锁模操作，中心波长为1559.49 nm， 3db频谱带宽为16.60 nm，脉冲持续时间为1.01 ps，基频重复频率为22.1 MHz，射频（RF）频谱信噪比（SNR）为68.61 dB。TiO2的调制深度为5.96%，饱和强度为0.7149 MW/cm2。本研究验证了金红石相TiO2作为1.5 μm波段超快光纤激光器高效稳定的SA的可行性。图形抽象

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