title: Asymmetric elliptic-cone-shaped microlens for efficient coupling to high-power laser diodes.
abstract: A new scheme of asymmetric elliptic-cone-shaped microlens (AECSM) employing a single-step fabrication technique for efficient coupling between the high-power 980-nm laser diodes and the single-mode fibers is proposed. The AECSMs are fabricated by asymmetrically shaping the fiber during the single-step grinding process and elliptically lensing the fiber tip during the fusing process. A maximum coupling efficiency of 85% and a high-average coupling efficiency of 71% have been demonstrated for a 980-nm laser diode with a high aspect ratio of 5. In comparison with the previous works on asymmetric fiber microlenses fabricated by the multi-step processes with complicated fabrication, the advantages of the AECSM structure for achieving high coupling are a single-step fabrication, a reproducible process, and a high-yield output. Therefore, this AECSM can form different aspect ratios of asymmetric elliptical microlenses to match the far field of the high-power diode lasers that is suitable for use in commercial high-power pump laser modules.
authors.forename: Yu-Kuan
authors.initials: YK
authors.lastname: Lu
authors.forename: Ying-Chien
authors.initials: YC
authors.lastname: Tsai
authors.forename: Yu-Da
authors.initials: YD
authors.lastname: Liu
authors.forename: Szu-Ming
authors.initials: SM
authors.lastname: Yeh
authors.forename: Chi-Chung
authors.initials: CC
authors.lastname: Lin
authors.forename: Wood-Hi
authors.initials: WH
authors.lastname: Cheng