High-power wavelength-tunable ultrashort pulse fiber laser at 2 µm
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摘要: 高功率2 µm波长可调谐的超短脉冲激光具有峰值功率高、脉冲宽度窄、波长可调谐等优势，在医疗手术、大气通信、光电对抗等领域具有广泛的应用。利用高峰值功率的掺铒光纤放大器泵浦高非线性光纤，在全光纤化结构中获得了1895～2165 nm可调谐的拉曼孤子输出。采用啁啾脉冲放大技术对拉曼孤子的脉冲能量进行提升，放大后拉曼孤子的单脉冲能量为1.56 µJ，平均功率达到50.6 W，脉冲宽度为83 ps。经过光栅对压缩后，脉冲宽度降低至1.23 ps，平均功率为22 W，峰值功率达到0.55 MW。放大后的脉冲仍具有波长调谐的能力，当输出功率为5 W和50.6 W时，脉冲的波长调谐范围分别为38 nm和8 nm。Abstract: Two-µm ultrashort pulse laser with high power and tunable wavelength has been widely applied in medical surgery, atmospheric communication, photoelectric countermeasures and other fields, owning to the advantages of high peak power, narrow pulse width, tunable-wavelength, etc. We achieved a tunable Raman soliton output at 1895～2165 nm in an all-optical fiber thinning structure using a high nonlinear fiber pumped by an erbium-doped fiber amplifier with high peak power. The pulse energy of the Raman soliton was enhanced by the chirped pulse amplification technique. After amplification, a single pulse energy of 1.56 μJ, an average power of 50.6 W and a pulse width of 83 ps were achieved. After grating pair compression, a pulse width of 1.23 ps, an average power of 22 W and a peak power of 0.55 MW could be realized. The amplified pulse still has the ability of wavelength tuning. The wavelength tuning ranges of the pulse are 38 nm at average power of 5 W and 8 nm at average power of 50.6 W, respectively.
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Key words:
- Raman soliton /
- wavelength tunable /
- ultrashort pulse /
- high power fiber laser /
- all-fiber
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图 1 拉曼孤子光源实验装置图
Figure 1. Experimental setup of Raman soliton laser
WDM: wavelength division multiplexer; EDFC: erbium-doped fiber; SESAM: semiconductor saturable absorption mirror; ISO: isolator APC: angled physical contact；SMF-28: single-mode fiber；HNLF: highly nonlinear optical fiber
图 2 掺铥光纤放大器实验装置图
Figure 2. Experimental device diagram of thulium-doped fiber amplifier
WDM: wavelength division multiplexer; TDF: thulium-doped fiber; DCF: dispersion compensating fiber; ISO: isolator；DM: dichroic mirror
图 3 掺铒光纤振荡器的脉冲输出特性
Figure 3. Pulse output characteristics of erbium-doped fiber oscillator
图 4 掺铒光纤放大器的脉冲输出特性
Figure 4. Pulse output characteristics of erbium-doped fiber amplifier
图 5 不同泵浦功率下拉曼孤子的输出特性
Figure 5. Output characteristics of Raman soliton at different pump power
图 7 不同输出功率下二级包层放大器的输出光谱
Figure 7. Output optical spectrum of the second stage cladding amplifier at different output power
图 8 不同拉曼波长下二级包层放大器的输出光谱
Figure 8. Optical spectrum of the second stage cladding amplifier at different Raman wavelengths
图 9 三级包层放大器输出脉冲的特性
Figure 9. Output pulse characteristics of the third stage cladding amplifier
表 1 色散管理掺铒光纤振荡器中的光纤参数
Table 1. Fiber parameters of the dispersion managed erbium-doped fiber laser
fiber type dispersion/（ps2/km，@1550 nm） fiber length/m net dispersion/ps2 EDFC 23.495 2.5 −0.028 SMF-28 −22.86 3.8 
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