High efficiency mid-infrared 3.8 μm MgO:PPLN optical parametric oscillator pumped by narrow linewidth 1064 nm fiber laser
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摘要: 采用放大1064 nm掺镱光纤激光器作为泵浦源，实现了中红外3.8 μm MgO:PPLN 光参量振荡（OPO）激光输出。在泵浦源中，采用分布式反馈激光器（DFB）作为种子源来实现光纤激光窄线宽的调制，实现线宽2.5 nm到0.1 nm的压缩，最大平均输出功率可达40 W。进一步对不同泵浦线宽条件下中红外3.8 μm MgO:PPLN OPO激光进行研究，最终在泵浦功率为18.1 W、线宽为0.1 nm、重频为1 MHz、脉宽为2 ns时，获得了最高平均输出功率为2.06 W的3822.5 nm激光输出，光-光转换效率为11.38%，光束质量为M2=2.34，提高了窄线宽泵浦对中红外MgO:PPLN OPO激光输出效率。Abstract: In this paper, a 1064 nm ytterbium-doped fiber laser with Main Oscillation Power Amplification (MOPA) was used as the pump source to achieve mid-infrared 3.8 μm MgO:PPLN Optical Parametric Oscillation (OPO) laser output. In the pump source, the Distributed Feedback Laser (DFB) was used as the seed source to realize the modulation of the narrow linewidth of the fiber laser. The linewidth of 2.5 nm was compressed to 0.1 nm, and the maximum output power was 40 W. The mid-infrared 3.8 μm MgO:PPLN OPO laser was researched under different pump linewidths. Finally, when the pump power was 18.1 W, the line width was 0.1 nm, the repetition frequency was 1 MHz, and the pulse width was 2 ns, the output laser with the maximum power of 2.06 W and the wavelength of 3822.5 nm was achieved. The corresponding optical-optical conversion efficiency is 11.38%, and the beam quality is M2 = 2.34. This research can efficiency improve the output efficiency of narrow linewidth pumped mid-infrared MgO:PPLN OPO.
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Key words:
- fiber laser /
- MgO:PPLN /
- optical parametric oscillator
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图 1 不同泵浦光线宽下闲频光线宽展宽与闲频光波长的关系曲线
Figure 1. Relationship between idle light broadening and idle wavelength under different pump light linewidthes
图 2 1064 nm掺镱光纤激光器装置图
Figure 2. Schematic diagram of 1064 nm ytterbium-doped fiber laser
图 3 1064 nm掺镱光纤激光器泵浦的MgO:PPLN OPO实验装置示意图
Figure 3. Schematic diagram of MgO:PPLN OPO laser pumped by 1064 nm ytterbium-doped fiber laser
图 4 1064 nm掺镱光纤激光器输出光谱对比图
Figure 4. Comparison of output spectrum of the 1064 nm ytterbium-doped fiber laser
图 5 不同线宽下1064 nm掺镱光纤激光器的平均输出功率对比图
Figure 5. Comparison of output power of the 1064 nm ytterbium-doped fiber laser with different linewidths
图 6 窄线宽1064 nm掺镱光纤激光光束质量
Figure 6. Beam quality of the narrow linewidth 1064 nm ytterbium-doped fiber laser
图 7 不同线宽1064 nm掺镱光纤激光泵浦MgO:PPLN OPO平均输出功率
Figure 7. The output powers of MgO:PPLN OPO pumped by 1064 nm ytterbium-doped fiber laser with different linewidths
图 8 窄线宽1064 nm掺镱光纤激光泵浦MgO:PPLN OPO输出光谱图
Figure 8. The output spectrum of MgO:PPLN OPO pumped by the narrow linewidth 1064 nm ytterbium-doped fiber laser
图 9 MgO:PPLN OPO 3.8 μm激光输出脉冲序列和脉冲宽度图
Figure 9. Pulse sequence and pulse width of the MgO:PPLN OPO 3.8 μm laser
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