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High Power Laser Science and Engineering, (2017), Vol. 5, e30, 5 pages.

licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.

doi:10.1017/hpl.2017.31

kW-level, narrow-linewidth linearly polarized ﬁber

laser with excellent beam quality through compact

one-stage ampliﬁcation scheme

Man Jiang

, Pengfei Ma

1,2

, Long Huang

, Jiangming Xu

1,2

, Pu Zhou

1,2

, and Xijia Gu

College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, China

Hunan Provincial Collaborative Innovation Center of High Power Fiber Laser, Changsha 410073, China

Department of Electrical and Computer Engineering, Ryerson University, 350 Victoria St., Toronto, Ontario M5B 2K3, Canada

(Received 4 June 2017; revised 30 September 2017; accepted 30 October 2017)

Abstract

In this manuscript, we demonstrate high-power, narrow-linewidth linearly polarized ﬁber laser with excellent beam

quality through compact one-stage ampliﬁcation scheme. By employing a single-mode–multimode–single-mode

structure seed laser, a linearly polarized Yb-doped ﬁber laser with narrow linewidth and high output power is achieved.

This laser, when used as a master oscillator, can be capable of suppressing the ASE in the process of power ampliﬁcation.

Thus, only one-stage ampliﬁcation structure is used to scale up the laser power, and linearly polarized output with a

polarization extinction ration of 14 dB, a narrow linewidth of 0.3 nm and an output power of 1018 W are achieved.

Moreover, due to the good beam quality of seed laser and the well-designed ampliﬁer stage, the beam quality of the

output laser is near-diffraction-limited with M

∼ 1.18 and M

∼ 1.24 at the maximum power, and without mode

instability occurring.

Keywords: ﬁber ampliﬁer; ﬁber Bragg grating; linearly polarization; narrow linewidth

1. Introduction

The technology of high-power ﬁber laser has made im-

pressive progress in the last decades – output power of

single-mode near-diffraction-limited Yb-doped ﬁber (YDF)

lasers reached ∼5 kW when pumped entirely by diodes and

∼10 kW with the ampliﬁer in-band tandem pumping

[1, 2]

However, further output power scale-up faces some major

obstacles coming from ﬁber nonlinearities, transverse mode

instability (MI) and optical damage, which are very challeng-

ing to overcome. Many research groups have been studying

alternative techniques to scale up laser power; among them,

spectral beam combining (SBC) stands out as a promising

one to achieve high brightness laser source

[3–7]

Due to the spectral dispersion of the dispersive elements

used in the SBC such as multilayer dielectric gratings

[3, 4]

or volume Bragg gratings

[5]

, the linewidth of each individ-

ual beam has to be reasonably narrow in order to endure

the quality of the combined beam. Therefore, a narrow-

linewidth YDF laser has attracted considerable attention

Correspondence to: P. Zhou, College of Optoelectronic Science

and Engineering, National University of Defense Technology, Changsha

410073, China. Email: zhoupu203@163.com

for further brightness scaling. In Ref. [3], 96 channels of

∼300 W ﬁber lasers were combined into one single beam

of 30-kW output power, which is the typical milestone in

high-power SBC. Power scaling should be expected if the

output power of each element could be increased to kW

level. In fact, Zheng et al. reported an eight-element ﬁber

laser SBC system that achieved 10.8 kW, and each channel

were 1.5 kW

[6]

. However, three-stage YDF ampliﬁer chains

were used in order to boost the output power of the nar-

rowband laser seed, that made the individual laser element

complicated. To obtain high-power narrow-linewidth laser

source, many works were based on cascaded multi-stage

power ampliﬁcation scheme to boost the output power

[8–11]

Moreover, in an SBC system, a polarization-independent

multilayer dielectric diffraction grating had been used and

each individual laser element was randomly polarized with

a diffraction efﬁciency of 94%

[6]

, while the diffraction ef-

ﬁciency of the polarization-dependent multilayer dielectric

grating can be as high as 97%

[12]

. Thus, one can increase

the combined efﬁciency by employing the linearly polarized

laser array. Therefore, high-power linearly polarized ﬁber

laser channel with compact structure would optimize the

performance of SBC system.

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