A single-longitudinal-mode(SLM) thulium-doped fiber laser based on an F-P narrowband filter and compound rings cavity is proposed. The compound rings incorporated in the cavity can help to achieve SLM lasing by adjusting the cavity FSR and it also plays the role of narrowband filtering. A theoretical model which can numerically calculate the transmission spectrum of the complex multi-ring sub-cavity filter is proposed. The output wavelength of the laser source is 1 941.56 nm, and the optical signal-to-noise ratio is 55.8 dB. The wavelength and power fluctuations within 70 min were less than 0.019 nm and 1.464 dB, respectively. Experimental results also show that the laser operates in a stable SLM state. The frequency noise characteristic of the proposed SLM laser was measured by a homemade unbalanced Michelson interferometer, and laser linewidth under different measurement time was estimated from the frequency noise spectra based on the,β,-separation line method. The calculated laser linewidth in 2 ms measurement time is 14.194 kHz.
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A Tunable Single-longitudinal-mode Thulium-doped Fiber Laser Enabled by A Passive Double-ring Compound Sub-cavity Filter
Single-longitudinal Mode Thulium-doped Fiber Laser in 2 050 nm Band Based on Passive Compound Triple-ring Cavity
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固体激光重点实验室,中国科学院理化技术研究所
Photonics Information Innovation Center, College of Physics Science & Technology, Hebei University
Key Laboratory of All Optical Network and Advanced Telecommunication Network, Ministry of Education, Institute of Lightwave Technology Beijing Jiaotong University
School of Electronic and Information Engineering, Beijing Jiaotong University
Photonics Information Innovation Center, College of Physics Science & Technology, Hebei University