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.
We report on the experimental and numerical studies exploring dynamical processes of soliton birth and annihilation of solitons in the laser ring cavity. The specific purpose of the research is focused on the exact control of the pulse repetition rate of a harmonically mode-locked fiber laser. We have demonstrated that the birth of a new pulse occurs from the soliton background (i.e., from the dispersive waves) through its shaping to the soliton or from the existing pulse through its splitting. The injection of external continuous wave (CW) allows one-by-one change of the number of solitons in the laser cavity thus enabling the fine-tuning of the pulse repetition rate. We present new experimental observations of the laser transition dynamics associated with the changes of the soliton numbers and give clear insight into the possible physical mechanisms responsible for these effects.
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