2 kW single-mode fiber laser employing bidirectional- pump scheme

Fan Zhang; Xinhai Zhang

doi:10.3969/j.issn.1003-501x.2017.10.002

Opto-Electronic Engineering, Volume. 44, Issue 10, 953(2017)

2 kW single-mode fiber laser employing bidirectional- pump scheme

Fan Zhang^1,2 and Xinhai Zhang^1、*

¹Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China

²Key Laboratory of Optical Information Science and Technology, Ministry of Education, Institute of Modern Optics, Nankai University, Tianjin 300071, China

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A 2 kW single-mode fiber laser with two cascade home-made cladding light strippers (CLSs) has been demonstrated by employing bidirectional-pump scheme. 2.009 kW signal power is obtained when pump power is 2.63 kW and the slope efficiency is 76.6%. Raman Stokes light is less than -47 dB at 2.009 kW even with a 10-m delivery fiber with core/inner cladding diameter of 20 μm/400 μm. The beam quality M²≤1.2 and the spectral FWHM bandwidth is 4.34 nm. There is no transverse mode instability and the output power stability of ±0.14% is achieved by special thermal management for a more uniform temperature distribution on the Yb-doped gain fiber.

Keywords

fiber laser high power power stability stimulated Raman scattering

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Fan Zhang, Xinhai Zhang. 2 kW single-mode fiber laser employing bidirectional- pump scheme[J]. Opto-Electronic Engineering, 2017, 44(10): 953

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