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

  • Shen Benjian National University of Defense Technology, Changsha
  • Tan Jichun National University of Defense Technology, Changsha
  • Guangwei Zheng National University of Defense Technology, Changsha
  • Yanlan He National University of Defense Technology, Changsha
DOI: https://doi.org/10.14429/dsj.61.528
Keywords: High power laser, Spectral beam combining, channel spectral separation narrowing, Sidelobe suppression, Apodized volume Bragg grating

Abstract

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

Author Biographies

Shen Benjian, National University of Defense Technology, Changsha
College of Science, National University of Defense Technology
Tan Jichun, National University of Defense Technology, Changsha
College of Science, National University of Defense Technology
Guangwei Zheng, National University of Defense Technology, Changsha
College of Science, National University of Defense Technology
Yanlan He, National University of Defense Technology, Changsha
College of Science, National University of Defense Technology
Published
2011-04-28
How to Cite
Benjian, S., Jichun, T., Zheng, G., & He, Y. (2011). Channel Spectral Separation Narrowing for Spectral Beam Combining by Apodisation of the Reflecting Volume Bragg Grating. Defence Science Journal, 61(3), 201-205. https://doi.org/10.14429/dsj.61.528
Issue
Vol 61 No 3
Section
Research Papers
Copyright (c) 2016 Defence Science Journal

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