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Expansion of the channel number in spectral beam combining of fiber lasers array based on cascaded gratings |
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| Authors: | Xingchun Chu Shanghong Zhao Lei Shi Shengbao Zhan Jie Xu Zhuoliang Wu |
| Institution: | 1. Department of Computer Science, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil;2. Orange Labs, 2 avenue Pierre Marzin, 22307 Lannion, France;3. PPME EA3325, University of New-Caledonia, BP R4 98851, Nouméa, New Caledonia;4. GREYC CNRS UMR6072, University of Caen, Caen, France;5. Université de Lyon, CNRS, INRIA, INSA-Lyon, LIRIS, UMR5205, F-69621 Villeurbanne, France |
| Abstract: | Aiming at the problem that the channel number in spectral beam combining (SBC) of fiber lasers array is limited by the narrow spectral selectivity of grating, a new scheme based on cascaded volume Bragg gratings (VBG) is proposed to expand the channel number. A system cascaded by two VBGs is presented and analyzed. A formula used to accurately determine the angle of incidence of all the channels is derived using rigorous coupled-wave analysis (RCWA). The channel number can be multiplied with increasing the number of VBGs. Numerical results show that the system based on cascaded VBGs is a good SBC combiner that has the ability to combine a large number of channels. |
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