6.7 kW LD-Pumped Nearly-Single-Mode MOPA Fiber Laser Enabled by Low-NA Confined-Doped Fiber
Optimized designs of the ytterbium-doped fiber (YDF) have been effective at mitigating transverse mode instability (TMI) and enabling high-power scaling. In this study, the use of low-NA confined-doped YDFs is explored to achieve high-power nearly-single-mode continuous-wave lasers. Three types of 25/500 µm YDFs are manufactured with ~80% doping ratio and respective NAs of 0.058, 0.053, and 0.048. Experimental results indicate that the corresponding TMI thresholds increase with the descending NA in the YDFs. Based on the YDF with a NA of 0.048, the master oscillation power amplification (MOPA) fiber laser is scaled to 6.79 kW with nearly-single-mode beam quality.
Authors
- Pengfei Ma (ORCID: https://orcid.org/0000-0002-6146-7419)
- Baolai Yang (ORCID: https://orcid.org/0000-0003-4158-3882)
- Xiao Hu (ORCID: https://orcid.org/0000-0003-1128-4099)
- Lili Hu (ORCID: https://orcid.org/0000-0003-0704-2206)
- Lei Zhang (ORCID: https://orcid.org/0000-0002-9248-9661)
- Zilun Chen
- B. Gowri Sankara Rao
- Yufei Gan
- Meng Wang (ORCID: https://orcid.org/0009-0002-6796-4878)
- Fan Wang (ORCID: https://orcid.org/0000-0003-4603-4153)
- Zefeng Wang (ORCID: https://orcid.org/0000-0002-5044-5150)
- Hengyu Tang
- Zhixian Li (ORCID: https://orcid.org/0000-0002-3544-7051)
Institutions
- National University of Defense Technology (CN)
- Chinese Academy of Sciences (CN)
- Shanghai Institute of Optics and Fine Mechanics (CN)
Publication Details
- Journal
- Photonics
- Published
- 2025-09-30
- DOI
- https://doi.org/10.3390/photonics12100971
- Primary Topic
- Photonic Crystal and Fiber Optics
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National University of Defense Technology