TY - JOUR AU - Shen Benjian AU - Tan Jichun AU - Guangwei Zheng AU - Yanlan He PY - 2011/04/28 Y2 - 2024/03/29 TI - Channel Spectral Separation Narrowing for Spectral Beam Combining by Apodisation of the Reflecting Volume Bragg Grating JF - Defence Science Journal JA - DSJ VL - 61 IS - 3 SE - Research Papers DO - 10.14429/dsj.61.528 UR - https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/528 AB - 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 chain-matrix 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.Defence Science Journal, 2011, 61(3), pp.201-205, DOI:http://dx.doi.org/10.14429/dsj.61.528 ER -