Ultrafast fiber laser based on bismuth telluride evanescent field mode-locked device
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摘要: 为使光纤激光器在被动谐波锁模状态下实现锁模脉冲高重复频率输出，本文通过激光沉积法制备了一种基于非线性拓扑绝缘体材料碲化铋与侧面抛磨光纤相结合的可饱和吸收体锁模器件，该器件调制深度、非饱和损耗、饱和强度分别为23.96%、37.77%、31.5 MW/cm2。将其应用在掺铒光纤激光器中，通过对整个腔内色散参数的调整，以及利用材料自身良好的非线性可饱和吸收能力，成功实现了锁模自启动，其中心波长为1555.67 nm，脉冲宽度为487 fs，重复频率为47.87 MHz，信噪比为58 dB。当泵浦功率超过150 mW时出现锁模脉冲的谐波分裂，持续对泵浦功率进行微调，增加直至最高功率250 mW时，出现了11阶谐波锁模脉冲，重复频率最高达到528 MHz，此时的信噪比为41.5 dB。本文结果证明利用侧面抛磨光纤结构的倏逝场，能够辅助材料提升一定的激光抗损伤能力，便于其在基本锁模状态下进一步实现被动谐波锁模，满足锁模脉冲高重频的产生及探究，对材料在高重频超快光纤激光器中的应用具有重要意义。Abstract: In order to realize the passively harmonic mode-locking with high repetition rate in the fiber laser. A saturable absorber (SA) based on two dimensional (2D) topological insulators material of Bismuth telluride (Bi2Te3), combining with a side-polished fiber, was fabricated by laser deposition technology in this study. This device has a modulation depth of 23.96%, nonsaturable loss of 37.77% and saturable intensity of 31.5 MW/cm2. According to the adjustment of dispersion in the whole cavity and the excellent nonlinear saturable absorb character in topological insulator materials, a self-starting mode-locking is realized successfully when this SA device is applied in the Er-doped fiber laser, with a central wavelength of 1555.67 nm, pulse duration of 487 fs, repetition rate of 47.87 MHz and signal-to-noise ratio of 58 dB. A harmonic mode-locking is achieved when the pump power is over 150 mW. When we adjust and increase slightly the pump power till 250 mW, the harmonic mode-locking of 11 orders is achieved with the repetition rate of 528 MHz and the signal-to-noise ratio of 41.5 dB. These results demonstrate that with the evanescent field produced by the side-polished fiber, the damage threshold of materials can be improved and the passively harmonic mode-locking with high repetition rate is realized, which has a great significance for the materials in the application of ultrafast fiber laser with high repetition rate.
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Key words:
- tow dimensional material /
- saturable absorber /
- evanescent field /
- ultrafast fiber laser
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图 1 (a)碲化铋样品扫描电镜(SEM)图；(b)碲化铋粉末X射线衍射图谱；(c)碲化铋样品拉曼光谱；(d)碲化铋样品原子力显微镜图；(e)碲化铋样品光学线性吸收图
Figure 1. (a) Scanning Electron Microscope (SEM) image of bismuth telluride sample; (b) X-ray diffraction pattern of bismuth telluride powder; (c) Raman spectrum of bismuth telluride sample; (d) atomic force microscope image of bismuth telluride sample; (e) optical linear absorption of bismuth telluride sample
图 2 (a) D型光纤结构图；(b) 激光沉积装置图；(c) 激光沉积原理图；(d) D型光纤沉积前金相显微照片；(e) D型光纤沉积后金相显微照片；(f) D型光纤电子显微镜表征图；(g) D型光纤抛磨区域内材料元素分布图
Figure 2. (a) D-shaped optical fiber structure; schematic diagram of (b) laser deposition device and (c) laser deposition principal; metallographic microscope image of D-shaped optical fiber (d) before deposition and (e) after deposition; (f) SEM image of D-shaped fiber; (g) mapping image of elements distribution in polishing area of D-shaped fiber
图 3 (a)双臂平衡探测装置示意图； (b)调制深度曲线图
Figure 3. (a) Schematic diagram of dual-arm balance detection device; (b) modulation depth curve
图 4 被动谐波锁模光纤激光器实验装置示意图
Figure 4. Schematic diagram of experimental setup of passively harmonic mode-locking fiber laser
图 5 (a)自启动锁模光谱图；(b)锁模时域图；(c)锁模频域图；(d)锁模脉冲持续时间图
Figure 5. (a) Spectrogram of self-starting mode-locking; (b) time-domain diagram of mode-locking; (c) frequency-domain diagram of mode-locking; (d) pulse duration diagram of mode-locking
图 6 (a)11阶谐波锁模运作下的时域图；(b)11阶谐波锁模运作下的频域图；(c)泵浦功率与平均输出功率关系图；(d)30 h长时间锁模运作光谱图
Figure 6. (a) Time domain diagram under 11th-order harmonic mode-locking operation; (b) frequency domain diagram under 11th-order harmonic mode-locking operation; (c) relationship between pump power and average output power; (d) spectrum of 30 h long-time mode-locking operation
图 7 （a）同一制备参数下3个可饱和吸收器件的调制深度对比；(b)同一制备参数下3个可饱和吸收器件在光纤激光器中高重频输出性能比较
Figure 7. (a) Comparison of modulation depth for three saturated absorbers with same preparation parameters; (b) comparison of high repetition rate output performance of three saturated absorbers in the fiber laser with same preparation parameters
表 1 几种基于拓扑绝缘体材料的可饱和吸收器件用于1.5 μm光纤激光器时的非线性及脉冲输出性能的对比
Table 1. The nonlinear characteristics and pulse output characteristics of different saturated absorbers based on the topological insulator material used in a 1.5 μm fiber laser
Material type Integration method Modulation depth Saturable intensity/(MW·cm−2) Pulse energy/pJ Pulse width/fs Repetition rate/MHz Ref Sb2Te3 D-shaped fiber 6.0% 31 29.0 270 34.50 [34] Sb2Te3 D-shaped fiber 3.9% 106 39.6 449 22.13 [35] Sb2Te3 D-shaped fiber 6.0% 31 − 128 22.32 [6] CoSb3 D-shaped fiber 5.0% 16 6.9 833 14.48 [36] Bi2Te3 D-shaped fiber 15.7% 81 52.9 600 15.11 [37] Bi2Te3 polyvinyl alcohol(PVA) thin film 2.0% 180 46.3 1080 8.64 [23] Bi2Te3 D-shaped fiber 23.9% 32 7.6 487 528.00 This work 
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