Author(s): Ning, CY (Ning, Chaoyu); Zou, SZ (Zou, Shuzhen); Yu, HJ (Yu, Haijuan); He, CJ (He, Chaojian); Chen, XC (Chen, Xuechun); Xu, S (Xu, Shuang); Zuo, JX (Zuo, Jiexi); Li, XY (Li, Xinyao); Lin, XC (Lin, Xuechun)

Source: OPTICS EXPRESS Volume: 31 Issue: 26  Article Number: 43125  DOI: 10.1364/OE.511764  Published Date: 2023 DEC 18 

Abstract: We demonstrate a single -stage all -fiber nanosecond amplifier with a total average power of greater than 1.4 kW by employing what we believe to be a novel multi -cavity passively Q -switched fiber laser as the seed laser. The multi -cavity seed laser adopts a piece of Yb-doped fiber (YDF) as saturable absorber (SA), and it includes two external cavities resonating at 1030 nm and an internal cavity working at 1064 nm, respectively. Using such a scheme, a stable dual -channel laser output with a total average power of >35 W, a pulse width of 45 ns, and an optical conversion efficiency of 72% operating at 1064 nm is achieved. By power scaling the multi -cavity seed laser, a dual -channel single -stage nanosecond amplifier is obtained with a single -port average power of exceeding 700 W and a pulse energy of about 7.3 mJ. To the best of our knowledge, this work is the highest average power and optical conversion efficiency for passively Q -switched all -fiber laser employing SA fiber, and the highest average power for a single -stage all -fiber nanosecond amplifier. (c) 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Accession Number: WOS:001171702100011

Author Identifiers:

Author Web of Science ResearcherID     ORCID Number

Zhang, Yuyao KEH-7175-2024    

shuang, xu       0000-0003-2369-1767

ISSN: 1094-4087