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Channel Spectral Separation Narrowing for Spectral Beam Combining by Apodisation of the Reflecting Volume Bragg Grating

机译:反射体积布拉格光栅的变迹组合用于光谱束的通道光谱分离

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摘要

The sidelobe in diffraction efficiency of reflecting volume Bragg grating (RVBG) limits the wavelength channel spectral separation, which determines the combining power output in spectral beam combining (SBC) systems. A novel SBC system based on the apodised RVBG has been proposed to suppress the sidelobe. Several apodised RVBGs have been compared and the optimal apodised RVBG is obtained by using the chainmatrix approach. Numerical results show that the sidelobe could be suppressed excellently with Blackman apodised RVBG. In the numerical example, the minimal channel spectral separation was 1.0 nm for SBC system based on the RVBG and it decreased to 0.6 nm for the novel SBC system based on the Blackman apodised RVBG when the spectral combining efficiency of both systems achieves the same maximum value.
机译:反射体布拉格光栅(RVBG)的衍射效率旁瓣限制了波长通道的光谱分离,这决定了光谱束合成(SBC)系统中的合成功率输出。为了抑制旁瓣,提出了一种基于RVBG的新型SBC系统。已比较了几种变位RVBG,并通过使用chainmatrix方法获得了最佳变位RVBG。数值结果表明,利用Blackman抑制的RVBG可以很好地抑制旁瓣。在数值示例中,当两个系统的光谱组合效率达到相同的最大值时,基于RVBG的SBC系统的最小通道光谱间距为1.0 nm,对于基于Blackman的RVBG的新型SBC系统,最小通道光谱间距减小至0.6 nm 。

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