Journal
OPTICS EXPRESS
Volume 25, Issue 15, Pages 17192-17200Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.017192
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Funding
- National Natural Science Foundation of China [61377042, 61435003, 61421002]
- Open fund of Science and Technology on Solid-State Laser Laboratory [H04010501W2015000604]
- Fundamental Research Funds for the Central Universities [ZYGX2016J068]
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Coexistence of harmonic mode-locking (HML) and noise-like pulse (NLP) were experimentally observed in a dual-wavelength mode-locked Tm-doped fiber laser for the first time. The coexistence patterns were self-started and maintained within a wide pump range by appropriately setting the intra-cavity polarization state. The HML was obtained at 1955.3 nm with a varied repetition rate range from 324 MHz to 1.138 GHz which benefits from the dispersion compensation, while the NLP observing at 1983.2 nm can operate at either fundamental repetition rate of 4.765 MHz or second harmonic state. Experimental investigations show that the coexistence patterns are caused by the wavelength-dependent phase delay of the mode-locked fiber cavity. Moreover, dual-wavelength NLP was also observed for the first time at 2 mu m spectral region by changing the intra-cavity polarization state. (C) 2017 Optical Society of America
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