Fundamental and harmonic mode-locked h-shaped pulse generation using a figure-of-9 thulium-doped fiber laser

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Abstract
Herein, we present a fundamental and harmonic mode-locked figure-of-9 thulium-doped fiber laser using a nonlinear amplifying loop mirror. The generated fundamental mode-locked h-shaped pulse is centered at 1889 nm with an average output power reaching 282 mW and a pulse energy up to 1.23 µJ, which is the highest power and pulse energy of an h-shaped pulse. In the harmonic mode-locked regime, up to the 8th harmonic h-shaped pulse is obtained. The detailed characteristics of the h-shaped pulse are discussed. The proposed study shows that the figure-of-9 fiber laser can generate h-shaped pulses and also allows the generation of nanosecond pulses with a µJ-level pulse energy.
Funding Information
  • National Natural Science Foundation of China (11704260, 61575129, 61605122, 61775146, 61905146, 61905151)
  • Natural Science Foundation of Guangdong Province (2016A030310049)
  • National Basic Research Program of China (2016YFA0401100)
  • Science and Technology Planning Project of Guangdong Province (2014B010131006)
  • Science and Technology Planning Project of Shenzen Municipality (JCYJ20160328144942069, JCYJ20160427105041864, JCYJ20160520161351540, JCYJ20170302151146995, KQJSCX20160226194031)

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