.Design and optimization of a novel structure for efficient side-coupling of high power double-cladding fiber lasers[J].Optoelectronics Letters,2007,3(5):349-352 Design and optimization of a novel structure for efficient side-coupling of high power double-cladding fiber lasers ZHANG Fan WANG Chun-can RUI Geng JIAN Shui-sheng Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China Abstract:       A novel structure for efficient side-coupling of high power double-cladding fiber lasers is presented. The maximum coupling efficiency of this structure is more than 90% for TM-polarization in the 1 and -1 order but is only 40% for TE-polarization. Thus, a multi-layer stair-structure is introduced and optimized by combining transmission algorithm and genetic algorithm to obtain higher coupling efficiency η for TE-polarization and the maximum coupling efficiency almost reaches to 70%. Hits: 3592 Download times: 190 View Full Text    Download reader