20 June 2024Polarization maintaining fiber laser harmonically mode-locked due to SESAM with supermode noise suppression through continuous wave injection
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We report on fully polarization-maintaining Er-doped fiber laser mode-locked by SESAM. After adjusting the mode spot area on the SESAM the laser demonstrates the harmonic mode-locking in the whole pump range up to ~355mW with the maximum pulse repetition rate (PRR) ~1145MHz while the supermode suppression level (SSL) does not exceed 25 dB. It is shown that optical injection of an external continuous wave (CW) into the laser cavity results in an increase of the SSL by two-three orders of magnitude. Moreover, it is shown that the CW injection makes it possible to increase the critical pump power and, accordingly, to raise the maximum laser PRR up to the value of ~2195 MHz. This operation does not degrade the quality of laser polarization. Performed numerical simulations allow explaining the observed effects qualitatively.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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D. A. Korobko, V. A. Ribenek, P. A. Itrin, I S. Panyaev, M. V. Pribylov, A. A. Fotiadi, "Polarization maintaining fiber laser harmonically mode-locked due to SESAM with supermode noise suppression through continuous wave injection," Proc. SPIE 13003, Fiber Lasers and Glass Photonics: Materials through Applications IV, 130030W (20 June 2024); https://doi.org/10.1117/12.3022147