Title: Pump couplers in a cascaded structure

Authors: Xiao Chen; Qirong Xiao; Guangyong Jin; Ping Yan; Mali Gong

Addresses: Province Key Laboratory of Solid laser technology and application, Changchun University of Science and Technology, Changchun 130022, China ' Center for Photonics and Electronics, State Key Laboratory of Tribology, Department of Precision Instruments, Tsinghua University, Beijing 100084, China ' Province Key Laboratory of Solid laser technology and application, Changchun University of Science and Technology, Changchun 130022, China ' Center for Photonics and Electronics, State Key Laboratory of Tribology, Department of Precision Instruments, Tsinghua University, Beijing 100084, China ' Center for Photonics and Electronics, State Key Laboratory of Tribology, Department of Precision Instruments, Tsinghua University, Beijing 100084, China

Abstract: The coupling efficiency of the pump coupler determines the pump light injection capacity of a laser system. We have designed a pump coupler in a cascaded structure, in which two or more pump couplers are spliced together through signal fibres to form a new pump coupler with high coupling efficiency and high output power. In the experiment, (2 + 1) × 1 and (1 + 1) × 1 side-pumping couplers were made, respectively, and the two signal fibres were spliced to form a cascaded structure. Three LDs output power ∼400 W were spliced with the three pumping arms of the new pump coupler. A total output power of this cascaded-structured pump coupler was ∼1100 W, corresponding to a coupling efficiency as high as 91.6%. The loss of signal light was <0.4%.

Keywords: pump couplers; LD-pumped; high coupling efficiency; high output power; cascaded structure; pump light injection capacity; laser systems.

DOI: 10.1504/IJNT.2015.071806

International Journal of Nanotechnology, 2015 Vol.12 No.10/11/12, pp.926 - 934

Published online: 18 Sep 2015 *

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