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设计了一种基于半导体激光器调制技术的978nm纳秒脉冲掺镱全光纤激光器。该激光器采用主振荡功率放大结构,由调制半导体激光种子源和一级单模单包层掺镱光纤放大器组成。半导体激光种子源的光谱中心波长通过种子光自注入方式被定义为978.3nm,调制之后的激光脉冲宽度为4.5ns,重复频率在10~50 MHz范围内可调。当半导体激光种子源调制重复频率为50 MHz时,种子光被一级单包层掺镱光纤放大器放大至115mW,相应的激光中心波长为978.3nm,3dB光谱带宽为0.11nm,放大之后光谱中没有出现明显的放大自发辐射现象。
A 978nm nanosecond pulse Ytterbium all-fiber laser based on semiconductor laser modulation technology was designed. The laser oscillator using the main power amplifier structure, by the modulation of semiconductor laser seed source and a single-mode single-clad Ytterbium-doped fiber amplifier. The spectral center wavelength of the semiconductor laser seed source is defined as 978.3 nm by seed light self-injection, the pulse width of the laser after modulation is 4.5 ns, and the repetition frequency is adjustable in the range of 10 to 50 MHz. When the modulation repetition frequency of semiconductor laser seed source is 50 MHz, the seed light is amplified to 115mW by a single-clad ytterbium-doped fiber amplifier. The corresponding laser center wavelength is 978.3nm and the 3dB spectral bandwidth is 0.11nm. After amplification, there is no spectrum Significant amplification spontaneous emission phenomenon.