DocumentCode :
65169
Title :
Experimental Investigation on Evolution of the Beam Quality in a 2-kW High Power Fiber Amplifier
Author :
Liangjin Huang ; Wenliang Wang ; Jinyong Leng ; Shaofeng Guo ; Xiaojun Xu ; Xiang´ai Cheng
Author_Institution :
Coll. of Optoelectron. Sci. & Eng., Nat. Univ. of Defense Technol., Changsha, China
Volume :
26
Issue :
1
fYear :
2014
fDate :
Jan.1, 2014
Firstpage :
33
Lastpage :
36
Abstract :
The M2 value is a general metric to characterize the beam quality of the high power fiber lasers. In this letter, we demonstrated a near single-mode fiber amplifier with 2.04 kW output. To the best of the authors´ knowledge, we present the first evolution of the beam quality as a function of the signal output power in a multikilowatt class fiber laser utilizing step-index large-mode-area fiber. The M2 parameter of was preserved at any power level without mode instability. What is more, the evolution of the beam quality and the mode field experimentally verifies the superior thermal-optical property of the high power fiber lasers compared with other bulk solid-state lasers because of their geometry of the gain medium.
Keywords :
laser beams; laser modes; optical fibre amplifiers; thermo-optical effects; M2 value; beam quality; gain medium; high power fiber lasers; mode field; multikilowatt class fiber laser; near single-mode fiber amplifier; power 2.04 kW; signal output power; step-index large-mode-area fiber; superior thermal-optical property; Fiber lasers; Laser beams; Measurement by laser beam; Optical fiber amplifiers; Power amplifiers; Power generation; Power measurement; Beam quality; Ytterbium doped fiber amplifiers; fiber lasers; high power amplifiers;
fLanguage :
English
Journal_Title :
Photonics Technology Letters, IEEE
Publisher :
ieee
ISSN :
1041-1135
Type :
jour
DOI :
10.1109/LPT.2013.2287195
Filename :
6646195
Link To Document :
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