Search Results
Graphene Q-switched Yb:KYW planar waveguide laser
2015, Kim, Jun Wan, Young Choi, Sun, Aravazhi, Shanmugam, Pollnau, Markus, Griebner, Uwe, Petrov, Valentin, Bae, Sukang, Jun Ahn, Kwang, Yeom, Dong-Il, Rotermund, Fabian
A diode-pumped Yb:KYW planar waveguide laser, single-mode Q-switched by evanescent-field interaction with graphene, is demonstrated for the first time. Few-layer graphene grown by chemical vapor deposition is transferred onto the top of a guiding layer, which initiates stable Q-switched operation in a 2.4-cm-long waveguide laser operating near 1027 nm. Average output powers up to 34 mW and pulse durations as short as 349 ns are achieved. The measured output beam profile, clearly exhibiting a single mode, agrees well with the theoretically calculated mode intensity distribution inside the waveguide. As the pump power is increased, the repetition rate and pulse energy increase from 191 to 607 kHz and from 7.4 to 58.6 nJ, respectively, whereas the pulse duration decreases from 2.09 μs to 349 ns.
Graphene mode-locked Tm,Ho-codoped crystalline garnet laser producing 70-fs pulses near 21 µm
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, Valentin
Bilayer 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.
Sub-100 fs mode-locked Tm:CLTGG laser
2021, Wang, Li, Chen, Weidong, Pan, Zhongben, Loiko, Pavel, Bae, Ji Eun, Rotermund, Fabian, Mateos, Xavier, Griebner, Uwe, Petrov, Valentin
We report on the first sub-100 fs mode-locked laser operation of a Tm3+-doped disordered calcium lithium tantalum gallium garnet (Tm:CLTGG) crystal. Soliton mode-locking was initiated and stabilized by a transmission-type single-walled carbon nanotube saturable absorber. Pulses as short as 69 fs were achieved at a central wavelength of 2010.4 nm with an average power of 28 mW at a pulse repetition rate of ∼87.7 MHz. In the sub-100 fs regime, the maximum average output power amounted to 103 mW.