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- ItemGraphene mode-locked Tm,Ho-codoped crystalline garnet laser producing 70-fs pulses near 21 µm(Washington, DC : OSA, 2019) Zhao, Yongguang; Chen, Weidong; Wang, Li; Wang, Yicheng; Pan, Zhongben; Dai, Xiaojun; Yuan, Hualei; Cai, Huaqiang; Zhang, Yan; Bae, Ji Eun; Park, Tae Gwan; Rotermund, Fabian; Loiko, Pavel; Serres, Josep Maria; Mateos, Xavier; Shen, Deyuan; Griebner, Uwe; Petrov, ValentinBilayer graphene synthesized by chemical vapor deposition is successfully applied as a saturable absorber (SA) for the passive mode-locking of a Tm,Ho:CLNGG laser at 2093nm. Near transform-limited pulses as short as 70 fs, i.e., 10 optical cycles, are produced at a 89 MHz repetition rate with 69 mW average output power. To the best of our knowledge, these are the shortest pulses ever reported from graphene-SA mode-locked Tm, or Ho-lasers in the 2 µm spectral region, including bulk and fiber lasers.
- ItemSESAM mode-locked Tm:Y2O3 ceramic laser(Washington, DC : Soc., 2022) Zhang, Ning; Liu, Shande; Wang, Zhanxin; Liu, Jian; Xu, Xiaodong; Xu, Jun; Wang, Jun; Liu, Peng; Ma, Jie; Shen, Deyuan; Tang, Dingyuan; Lin, Hui; Zhang, Jian; Chen, Weidong; Zhao, Yongguang; Griebner, Uwe; Petrov, ValentinWe demonstrate a widely tunable and passively mode-locked Tm:Y2O3 ceramic laser in-band pumped by a 1627-nm Raman fiber laser. A tuning range of 318 nm, from 1833 to 2151 nm, is obtained in the continuous-wave regime. The SESAM mode-locked laser produces Fourier-transform-limited pulses as short as 75 fs at ∼ 2.06 µm with an average output power of 0.26 W at 86.3 MHz. For longer pulse durations of 178 fs, an average power of 0.59 W is achieved with a laser efficiency of 29%. This is, to the best of our knowledge, the first mode-locked Tm:Y2O3 laser in the femtosecond regime. The spectroscopic properties and laser performance confirm that Tm:Y2O3 transparent ceramics are a promising gain material for ultrafast lasers at 2 µm.