title: Thermal effects in kilowatt all-fiber MOPA.
abstract: Thermal effects and output power characteristics of kilowatt all-fiber master-oscillator power amplifier (MOPA) are investigated. Proper designs for cooling apparatus are proposed and demonstrated experimentally, for the purpose of minimizing splice heating which is critical for the reliability of high power operation. By using these optimized methods, a thermal damage-free, highly efficient ytterbium-doped double-clad fiber MOPA operating at 1080 nm with 1.17 kW output was obtained. The maximum surface temperature at the pump light launching end splice of the booster amplifier was 345 K, and the temperature rise for this key splice was 0.052 K/W.
authors.affiliation: Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Fan
authors.forename: Bing
authors.initials: B
authors.lastname: He
authors.forename: Jun
authors.initials: J
authors.lastname: Zhou
authors.forename: Jituo
authors.initials: J
authors.lastname: Zheng
authors.forename: Houkang
authors.initials: H
authors.lastname: Liu
authors.forename: Yunrong
authors.initials: Y
authors.lastname: Wei
authors.forename: Jingxing
authors.initials: J
authors.lastname: Dong
authors.forename: Qihong
authors.initials: Q
authors.lastname: Lou
mesh_terms: D000465:Algorithms; D000669:Amplifiers, Electronic; D004867:Equipment Design; D005336:Fiber Optic Technology / Q000379:methods; D008670:Metals / Q000737:chemistry; D015233:Models, Statistical; D055100:Optical Fibers; D055095:Optics and Photonics; D009991:Oscillometry / Q000379:methods*; D013499:Surface Properties; D013696:Temperature; D013814:Thermal Conductivity
chemical_list: D008670:Metals