Yan Feng-Ping, Liu Peng, Tan Zhong-Wei, Tao Pei-Lin, Li Qi, Peng Wan-Jing, Feng Ting, Tan Si-Yu. A novel method of improving coupling effiency of laser diode based on synthesized lens with graduaed index fiberJ. Acta Physica Sinica, 2012, 61(16): 164202. DOI: 10.7498/aps.61.164202