In this work, a single-frequency fiber amplifier with output power of 703 W was demonstrated at 1064 nm in an all-fiber configuration. Cascaded Yb3+-doped fiber structure with different dopant concentration and hybrid 915/976 nm pump scheme were employed in power scaling stage to improve the gain saturation for higher transverse mode instability threshold. An overall optical efficiency of 67.5% was achieved at the maximum output power and the M2 was measured to be ~1.4. A spectral linewidth of 2 kHz was achieved at the 703-W laser power, which is to the best of our knowledge, the first time that the linewidth of a kHz single-frequency fiber amplifier is characterized at such high laser power.
Laser performance of Yb3+-doped silica fiber laser at 980 nm and 1064 nm was investigated theoretically and experimentally. Significantly degraded laser output power at 980 nm was analyzed with photodarkening characterization of the Yb3+-doped silica fiber when lasing at 980 nm and 1064 nm, which shows that the Yb3+-doped fiber laser power difference between simulation and experiment is proportional to the level of photodarkening related to population inversion.
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