18 February 2016 Graphene mode-locked and Q-switched 2-μm Tm/Ho codoped fiber lasers using 1212-nm high-efficient pumping
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Abstract
We report graphene mode-locked or Q-switched Tm/Ho-codoped fiber laser pumped by a 1212-nm phosphorus-doped fiber Raman laser. First, comparison experiments were performed for a continuous-wave 2  μm Tm/Ho-codoped fiber laser pumped by a 1565-nm laser or a 1212-nm laser, verifying that the 1212-nm pumping is more efficient than the conventional ∼1560-nm pumping. Then, we further realized 1212-nm highly efficient pumped Tm/Ho-codoped fiber lasers mode-locked and Q-switched by a graphene saturable absorber, respectively. Using only 30-cm Tm-Ho gain fiber under the 1212-nm pumping, the passive Q-switching at a center wavelength of 1976 nm was efficiently generated with tunable repetition rate between 32.2 and 43.0 kHz and shortest pulse width of 1.41  μs. Moreover, the passive mode-locking at 1913.7 nm was stably achieved with a fundamental repetition rate of 19.978 MHz and pulse energy of ∼20  pJ. To the best of our knowledge, it is the first demonstration of 2-μm pulsed fiber lasers high efficiently pumped by a 1212-nm laser.
© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)
Zhengqian Luo, Yingyue Li, Yizhong Huang, Min Zhong, Xiaojiao Wan, "Graphene mode-locked and Q-switched 2-μm Tm/Ho codoped fiber lasers using 1212-nm high-efficient pumping," Optical Engineering 55(8), 081310 (18 February 2016). https://doi.org/10.1117/1.OE.55.8.081310 . Submission:
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