First Demonstration and Comparison of 5 kW Monolithic Fiber Laser Oscillator Pumped by 915 nm and 981 nm LDs

被引:6
|
作者
Wen, Yujun [1 ]
Wang, Peng [1 ,2 ,3 ]
Yang, Baolai [1 ,2 ,3 ]
Zhang, Hanwei [1 ,2 ,3 ]
Xi, Xiaoming [1 ,2 ,3 ]
Wang, Xiaolin [1 ,2 ,3 ]
Xu, Xiaojun [1 ,2 ,3 ]
机构
[1] Natl Univ Def Technol, Coll Adv Interdisciplinary Studies, Changsha 410073, Peoples R China
[2] Nanhu Laser Lab, Changsha 410073, Peoples R China
[3] Hunan Prov Key Lab High Energy Laser Technol, Changsha 410073, Peoples R China
关键词
high-power fiber laser; ytterbium-doped fiber laser oscillator; transverse mode instability; stimulated Raman scattering; pump wavelength; HIGH-POWER; INSTABILITY;
D O I
10.3390/photonics9100716
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Fiber laser performances including transverse mode instability (TMI), stimulated Raman scattering (SRS) and optical-to-optical efficiency are in connection with the pump wavelength. Here we studied the output characteristics of a 5-kW ytterbium-doped fiber laser oscillator pumped with two different pump sources, i.e., 915 nm and 981 nm laser diodes (LDs). The output characteristics of fiber laser oscillators pumped by 915 nm and 981 nm have been compared strictly and directly with the same structure in a high-power situation. Experimental results show that both pump wavelengths can scale the power up to more than 5 kW by suppressing the TMI effect. While in the case of pumping by the 981 nm LDs, the laser oscillator has an optical-to-optical efficiency of 87%, which is 13% higher than that of the 915 nm pumped scheme. In addition, due to the higher backward pumping ratio and lower total pump power, the laser oscillator has a better SRS suppression ratio when pumped at 981 nm. Thus, it reveals a great potential to balance the limitations of TMI and SRS for scaling up to an even higher output while pumping at 981 nm. All the devices of the oscillator are commercial, and it will be helpful for the commercialization of high-power fiber laser oscillators.
引用
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页数:9
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