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Stable multiwavelength Tm‐doped fiber laser with a microfiber knot resonator
Author(s) -
Deng YaDong,
Zhou Yan,
Yin TaoCe,
Chen DaRu,
Yu ZhangWei,
Qiang ZeXuan
Publication year - 2020
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.32090
Subject(s) - microfiber , materials science , fiber laser , optics , resonator , comb filter , laser , knot (papermaking) , wavelength , optoelectronics , bandwidth (computing) , telecommunications , physics , composite material , engineering
We presented a compact and enduring multiwavelength Tm‐doped fiber laser at 2 μm employing a microfiber knot resonator (MKR). The MKR, made by the flame‐brushing technique, has a fiber diameter of 10 μm and a ring diameter of 150 μm. The MKR plays a role as both the comb filter and the power equalization device, which is critical for the stable multiwavelength Tm‐doped fiber laser. By properly adjusting the pump power, three wavelength lasing channels (1956.2, 1964.4, and 1971.8 nm) were observed stable and their average power density was around −8.76 dBm with 1 W pump power. In addition, the channel spacing is 5.8 nm with the 3‐dB bandwidth of the channel smaller than 0.5 nm. The experiments demonstrated that the MKR can be utilized as a comb filter with the suitable transmission spectrum to reach a steady multiwavelength Tm‐doped fiber laser.