Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 30, Issue 12, Pages 1107-1110Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2018.2834357
Keywords
Narrow linewidth; fiber amplifier; spectral broadening
Funding
- National Natural Science Foundation of China [61605191]
- Research Foundation of CAEP [TCGH1001-02]
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The dependence of the spectral broadening characteristics on the number of longitudinal modes is studied experimentally in a bi-directional pumping fiber amplifier. It is found that the linewidth of the amplifier decreases with reducing the longitudinal mode number of the seed source. In this letter, we present a 68 pm-linewidth kilowatt-level fiber laser using a simple master oscillator power amplifier structure. Meanwhile, we theoretically analyze the spectral broadening characteristics of the seeds with different longitudinal mode numbers. The conclusions are in agreement with the experimental results. This provides a simple and efficient method for obtaining the high power narrow linewidth fiber laser used in spectral beam combining.
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