Besides, the simulation results show that the intensity distribution profile of the transverse modes become smooth with the insertion of VBG, but the diffraction losses of transverse modes are increasing, and the diffraction loss increases with the order number of transverse modes increasing. Moreover, the loss difference between modes is getting large under the effect of VBG. The high loss difference between different modes is good for transverse mode selection, and VBG with reasonable angular selectivity in laser resonator will force the multi-mode to operate in a single transverse mode, which may has potential applications in lasers.
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Jing Hu, Fan Gao, Xiang Zhang, Xiao Yuan, "Theoretical study of transverse mode selection in laser resonator with volume Bragg gratings," Proc. SPIE 10016, High-Power Lasers and Applications VIII, 100161Q (9 November 2016);