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Study on the Lasing Characteristics of a Yb-Doped Fiber Laser by Using a Fiber Bragg Grating
New Phys.: Sae Mulli 2019; 69: 208~214
Published online February 28, 2019;
© 2019 New Physics: Sae Mulli.

Seoungjun OH1, Chihyun JUNG1, Jonghoon YI*1, Kangin LEE2

1 Department of Physics, Yeungnam University, Gyeongsan 38541, Korea

2 Hanhwa Laser and Sensor System Team, Seongnam 13488, Korea

Correspondence to:
Received December 11, 2018; Revised January 9, 2019; Accepted January 9, 2019.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
A fiber-coupled laser diode (LD) with a 976 nm emission wavelength was used to pump a Ytterbium (Yb)-doped large mode area fiber. Both ends of the fiber were bonded to fiber Bragg gratings (FBGs). The FBGs were used as an input mirror and an output coupler. The reflectivity of the FBG used as the input mirror was 95%, and that for the FBG used as the output coupler was 10\%. The core diameter of the Yb-doped optical fiber and FBG was 10 $\mu$m. The output power and spectra of Yb-doped fiber laser were measured versus the pump power of the LD. The wavelength of the fiber laser was 1063.39 nm, close to the wavelength of the  Nd:YAG laser. The lasing characteristics, such as the spatial distribution, temporal variation, and beam quality of the FBG laser power, were measured. When the pump power was 2.8 W, the output of the fiber laser was 1.5 W, and the output fluctuation was about 0.47%. The output characteristics were simulated and compared with the experimental results. Simulation results show that when the pump power is 2.8 W, the output of the fiber laser is 1.61 W. The length of the optical fiber was sufficiently long that most of the emission from the pump LD was absorbed. Even when the LD coolant temperature was changed by 12 $^\circ$C, the output was almost unchanged.
PACS numbers: 42.55.Wd, 42.55.Xi, 42.60.-v
Keywords: Fiber Bragg grating, Ytterbium-doped fiber, Fiber laser

February 2019, 69 (2)
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