Semiconductor saturable absorber mirror based mode-locked fibre laser was built. On amplification, a chain action caused saturable absorber damage, initiated by backward amplified spontaneous emission, multi-pulsing and self-pulsing were reported.

Mode-locked fibre laser damage on amplification due to multi-pulsing

Passive mode-locking in fiber lasers is investigated by numerical and experimental means. A non-distributed scalar model solving the nonlinear Schrodinger equation is implemented to study the starting behavior and intra-cavity dynamics numerically. Several operation regimes at positive net-cavity dispersion are experimentally accessed and studied in different environmentally stable, linear laser configurations. In particular, pulse formation and evolution in the chirped-pulse regime at highly positive cavity dispersion is discussed. Based on the experimental results a route to highly energetic pulse solutions is shown in numerical simulations.

/pdf/ultrashort-pulse-formation-and-evolution-in-mode-locked-1iyur9ath5.pdf

Ultrashort pulse formation and evolution in mode-locked fiber lasers

An erbium (Er)/ytterbium (Yb) co-doped double-clad fiber is configured to amplify single-mode pulses with a high average power of 10 W at a 1.5 µm center wavelength. The pulse duration at the exit of the Er/Yb fiber amplifier is measured to be ~440 fs after grating-based compression. The whole single-mode operation of the amplifier system permits the M 2-value of the output beam quality to be evaluated better than 1.05. By tuning the repetition rate from 100 MHz down to 600 kHz, the pulse peak power is scaled up to 19.1 MW to be the highest ever reported using an Er/Yb single-mode fiber. The proposed amplifier system is well suited for strong-power applications such as free-space LIDAR, non-thermal machining and medical surgery.

https://iopscience.iop.org/article/10.1088/1612-202X/aa7c91/pdf

Mode-locked fibre laser damage on amplification due to multi-pulsing

References

Ultrashort pulse formation and evolution in mode-locked fiber lasers

MW peak power Er/Yb-doped fiber femtosecond laser amplifier at 1.5 µm center wavelength

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