Study on Mode-locked Optical Fiber Devices Based on Bismuth Telluride Saturable Absorbers

Citation

王雍杰 (WANG Yongjie). (2023 年 3月). 基于碲化铋可饱和吸收体的锁模光纤器件研究 (Study on Mode-locked Optical Fiber Devices Based on Bismuth Telluride Saturable Absorbers) [硕 士 学 位 论 文 (Master Thesis), 学 科 专 业: 光学工程 (Discipline: Optical Engineering), 指 导 教 师: 张贺 副研究员 (Supervisor: Associate Professor He Zhang)]. 长春理工大学 (Changchun University of Science and Technology).

Keywords

• 锁模光纤激光器 / Mode-locked fiber lasers
• 可饱和吸收体 / Saturable Absorber, SA
• 碲化铋 / Bismuth Telluride, Bi2Te3
• 二维材料 / Two-dimensional materials
• 拓扑绝缘体 / Topological Insulators, TIs
• 超快光纤激光器 / Ultrafast fiber lasers
• 重复频率 / Repetition rate
• 玻璃薄膜 / Glass film
• Sb 掺杂 Bi2Te3 / Sb-doped Bi2Te3
• 溶胶-凝胶法 / Sol-gel technology
• TI/SiO2 薄膜 / TI/SiO2 film
• 损伤阈值 / Damage threshold
• 调制深度 / Modulation depth
• 饱和强度 / Saturable intensity
• 非饱和损耗 / Nonsaturable loss
• 掺铒光纤激光器 / Erbium-doped fiber laser

Brief

This master's thesis investigates the design, fabrication, and application of mode-locked fiber optic devices based on bismuth telluride saturable absorbers (SAs), aiming to enhance their nonlinear optical properties and damage threshold for achieving high-repetition-rate (GHz) pulsed laser output.

Summary

• Developing a lateral heterostructure (LHS) of Sb2Te3–Bi2Te3 to enhance nonlinear optical (NLO) properties and carrier mobility. This LHS SA was successfully used in an Er-doped fiber laser to achieve GHz repetition rate mode-locked pulses.
• Designing a novel SA using a glass film (TI/SiO2) containing Sb-doped Bi2Te3, fabricated using sol-gel technology, which demonstrated a significantly higher damage threshold compared to traditional polymer films. This SA enabled an Er-doped fiber laser to achieve harmonic mode-locking up to the 119th order, resulting in a 2.84 GHz repetition rate.

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