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| 非线性偏振旋转锁模双向输出超短脉冲光纤激光器 |
| Bidirectional fiber laser generating ultrashort pulses by nonlinear polarization rotation |
| 投稿时间：2024-01-18 |
| DOI：10.3969/j.issn.1005-5630.202401180008 |
| 中文关键词: 光纤激光器 非线性偏振旋转 超短脉冲 |
| 英文关键词:fiber laser nonlinear polarization rotation ultrashort pulses |
| 基金项目:国家重点研发计划(2018YFB0504400)；重庆市自然科学基金（cstc2021jcyj-msxmX1217) |
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| 中文摘要: |
| 研究了非线性偏振旋转锁模技术在全正色散掺镱光纤激光器中的应用。非线性偏振旋转是一种利用光纤中的克尔效应实现人工可调饱和吸收体的锁模方法，具有响应时间快、输出脉冲窄的优点。双向输出脉冲共享一个腔，可以有效抑制共模噪声。且双向输出激光器具有高集成、低成本的优势。设计并搭建了一种全正色散双向输出掺镱光纤激光器，利用非线性偏振旋转实现了自启动锁模。实验结果表明，该激光器可以在1 026.4 和1 040 nm两个波长处双向输出类噪声脉冲，脉冲持续时间为60 ps，输出光谱带宽分别为15 和25 nm，重复频率为46.04 MHz，信噪比均大于45 dB，顺时针和逆时针方向输出的单脉冲能量分别为5.0 和1.7 nJ。该激光器的输出特性为其在光学测量、光谱探测和生物医学等领域提供了潜在的应用价值。 |
| 英文摘要: |
| The application of nonlinear polarization rotation (NPR) mode-locking technology in all-normal-dispersion ytterbium-doped fiber lasers is investigated. Nonlinear polarization rotation is a mode-locking method that utilizes the Kerr effect in optical fibers to achieve an artificially tunable saturable absorber, offering advantages such as fast response time and narrow output pulses.Bidirectional output lasers have advantages of high integration and low cost due to the fact that bidirectional output pulses share a single cavity and can effectively suppress common mode noise. In our experiment, an all-normal-dispersion bidirectional output Yb-doped fiber laser was employed, which self-starting mode-locking was realized. The experimental results indicated that the laser yielded noise-like pulses (NLPs) in both directions at 1026.4 nm and 1040 nm wavelengths, with output spectral bandwidths of 15 nm and 25 nm. Output pulse energy for clockwise (CW) and counterclockwise (CCW) directions were 5 nJ and 1.7 nJ, respectively. The repetition frequency for the bidirectional output was at 46.04 MHz, and the signal-to-noise ratio for the each of bidirectional output was 45 dB. The pulse duration for the bidirectional output was 60 ps. The bidirectional ultrashort outputs of the laser provide potential applications in optical comb spectroscopy technology. |
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