腔长对方波脉冲输出特性影响的研究
Influence of Cavity Length on the Output Performances of Square Wave Pulse

DOI: 10.12677/OE.2019.94024, PP. 172-177

Keywords: 掺铥光纤激光器，被动锁模，方波脉冲，脉宽可调谐
Thulium Fiber Laser, Passively Mode-Locking, Square-Wave Pulse, Tunable Pulse Width

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Abstract:

采用双端泵浦方式，实现了基于非线性偏振旋转(NPR)技术的方波脉冲锁模掺铥光纤激光器。对腔长为125 m的铥光纤激光器，当泵浦功率为14 W时，方波脉冲的最大宽度为24.5 ns，最大输出功率为45.8 mW。输出激光的中心波长为2053 nm，谱宽为7 nm，重复频率为1.63 MHz，信噪比达60 dB。并且，随着泵浦功率的增加，方波脉冲宽度呈线性增长，脉冲的峰值功率始终稳定在1.32 W附近。在此基础上，还探讨了腔长对方波脉冲的输出特性的影响。
In this paper, the square-wave pulses were experimentally investigated in a bidirectionally pumped passively mode-locked thulium-doped fiber laser, basing on the nonlinear polarization rotation (NPR) technique. For the cavity length of 125 m, when the pump power is increased to 14 W, the square-wave pulse with a maximum pulse width of 24.5 ns is obtained, and the output power is 45.8 mW. The center wavelength is 2053 nm, the spectrum width is 7 nm, the repetition frequency is 1.63 MHz, and the signal-to-noise ratio up to 60 dB. With the increase of the pump power, the pulse width of the square wave is linearly increased, and the peak power of the pulse is stabilized at 1.32 W. Furthermore, the influences of cavity length on the output characteristics of square-wave pulse are also discussed.

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