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

Authors

  • 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

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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

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