64 dB gain Yb-doped fiber amplifier for small-signal lasers based on tandem pump cavity

• DOI: 10.1364/opticaopen.28927289.v1
• Publication Date: 2025-05-05T08:44:51Z
• Authors: Pei Ju; Wei Gao; Yanpeng Zhang; Haoyu Wang; zhaohui Li; Aifeng He; Zhe Li; Qi Gao; Wen-Hui Fan
• Keywords: Tandem; SIGNAL (programming language)

We propose a high-gain fiber amplifier based on tandem pump cavity tailored for small-signal lasers. The laser can obtain high gain when passing through the and is then be continuously amplified by core-pumping process. In our experimental setup, 50 μW signal to 128.5 W, achieving maximum of 64 dB, surpassing conventional capabilities. This approach offers promising pathway toward realizing compact, reliable, cost-effective amplifiers.