We experimentally demonstrate a passively harmonic mode locked (PHML) Er-doped fiber laser with pump power efficiency up to 17 MHz/mW operating at L-band based on single walled carbon nanotubes polyvinyl alcohol (SWCNTs-PVA) film. Under 233 mW pump power, the stable pulse train at 1594.97 nm with 40.5 dB side mode suppression ratio (SMSR) and 742 fs pulse duration is obtained at a repetition rate of 1.923 GHz, corresponding to 170th harmonic of the fundamental frequency. Under optimized intracavity conditions, the pulses frequency is able to scale up to 2.415 GHz with a high level of 40 dB SMSR, which to the best of our knowledge, is the highest value yet reported from a L-band PHML fiber laser incorporating SWCNTs as saturable absorber (SA). Such high repetition rate and stable fiber laser operating at L band may be desirable for various applications.
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- Mode locked fiber lasers
- mode locking
Huang, Q., Huang, Z., Araimi, M. A., Rozhin, A., & Mou, C. (2020). 2.4 GHz L-band passively harmonic mode locked Er-doped fiber laser based on carbon nanotubes film. IEEE Photonics Technology Letters, 32(2), 121-124. . https://doi.org/10.1109/LPT.2019.2960112