High average power spectral beam combining employing volume Bragg gratings
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摘要: 使用透射型体布拉格光栅组束两束光纤激光,实现了856 W光谱组束输出。总的光谱组束效率为73.7%,组束光束的横向质量因子为7.9,纵向质量因子为2.7。研究结果显示,虽然体光栅的角色散严重影响衍射光束的光束质量,但其并不影响透射光束的光束特性。由于当前宽谱光纤激光器的输出功率远大于窄线宽输出,使用宽谱光纤激光器（光谱带宽超过4 nm）作为透射光束,能够在不降低组束效率和组束光束质量的前提下,有效提升使用体布拉格光栅进行光谱组束的总输出功率。Abstract: We have achieved 856 W spectral beam combining output of two fiber lasers employing a transmitting volume Bragg grating (TVBG), which is the highest combining power of spectral beam combination by VBGs. The total spectral combining efficiency is 73.7% and the beam quality of combining beam is 7.9 and 2.7 in x and y direction, respectively. Though the diffraction beam is seriously stretched by angular dispersion of TVBG, the transmission beam preserves its beam properties in the high average power spectral beam combining. This indicates that the broadband fiber lasers (the spectral bandwidth is over 4 nm) can be used as transmission beam in high efficiency spectral beam combination of VBGs for higher combining power output.
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Key words:
- laser beam combining /
- spectral beam combining /
- volume gratings /
- diffraction efficiency /
- beam quality
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